U.S. patent application number 13/734395 was filed with the patent office on 2013-08-15 for fiber drop terminal.
This patent application is currently assigned to ADC Telecommunications, Inc.. The applicant listed for this patent is ADC Telecommunications, Inc.. Invention is credited to Michael Baren-Boym, Jeffrey Gniadek, Michael Noonan, Randy Reagan.
Application Number | 20130209099 13/734395 |
Document ID | / |
Family ID | 36262012 |
Filed Date | 2013-08-15 |
United States Patent
Application |
20130209099 |
Kind Code |
A1 |
Reagan; Randy ; et
al. |
August 15, 2013 |
FIBER DROP TERMINAL
Abstract
A drop terminal mounting system includes a fiber drop terminal
having a housing and a base attached to the housing. The housing
includes an outer surface containing a plurality of receptacles and
cooperatively defines an inner cavity with the base. The drop
terminal mounting system further includes a bracket having a first
fastening region and a second fastening region adapted to secure
the drop terminal to the bracket.
Inventors: |
Reagan; Randy; (Morristown,
NJ) ; Gniadek; Jeffrey; (Northbridge, MA) ;
Noonan; Michael; (Shrewsbury, MA) ; Baren-Boym;
Michael; (Farmingham, MA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ADC Telecommunications, Inc.; |
|
|
US |
|
|
Assignee: |
ADC Telecommunications,
Inc.
Eden Prairie
MN
|
Family ID: |
36262012 |
Appl. No.: |
13/734395 |
Filed: |
January 4, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13335469 |
Dec 22, 2011 |
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13734395 |
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12841879 |
Jul 22, 2010 |
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13335469 |
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12370340 |
Feb 12, 2009 |
7805044 |
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12841879 |
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12035674 |
Feb 22, 2008 |
7627222 |
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12370340 |
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11198848 |
Aug 8, 2005 |
7489849 |
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12035674 |
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60624582 |
Nov 3, 2004 |
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Current U.S.
Class: |
398/45 ;
398/67 |
Current CPC
Class: |
G02B 6/4446 20130101;
G02B 6/4442 20130101; G02B 6/4441 20130101; G02B 6/4466 20130101;
G02B 6/4444 20130101; G02B 6/4457 20130101; G02B 6/3885 20130101;
G02B 6/3897 20130101; H04B 10/25891 20200501 |
Class at
Publication: |
398/45 ;
398/67 |
International
Class: |
H04B 10/07 20060101
H04B010/07 |
Claims
1. (canceled)
2. A radio-frequency identification (RFID) method of deploying an
optical network comprising: providing a plurality of RFID tags,
each of the plurality of RFID tags being associated with a passive
optical network component; and writing data to the plurality of
RFID tags, each of the RFID tags being associated with a
corresponding passive optical network component, wherein the data
relates to at least one property of the corresponding passive
optical network component.
3. The method of claim 2, wherein the network components include
fiber drop terminals.
4. The method of claim 3, wherein the fiber drop terminals may be
used to stage a PON cabling system near premises locations.
5. The method of claim 2, wherein the property of the corresponding
passive optical network component includes subscribers associated
with output receptacles of the corresponding passive optical
network component.
6. The method of claim 2, wherein the property of the corresponding
passive optical network component includes central offices
supplying data to the corresponding passive optical network
component.
7. The method of claim 2, wherein the property of the corresponding
passive optical network component includes information associated
with maintenance of the corresponding passive optical network
component.
8. The method of claim 2, wherein the property of the corresponding
passive optical network component includes a geographical location
of the corresponding passive optical network component.
9. The method of claim 2, wherein writing data to the plurality of
RFID tags comprises storing new information in each RFID tag to
reflect a status and configuration of the corresponding passive
optical network component.
10. The method of claim 2, further comprising: receiving at the
passive optical network component optical signals carried on one or
more optical fibers; and routing the optical signals to end user
premises.
11. A radio-frequency identification (RFID) system for deploying an
optical network comprising: a plurality of RFID tags, each of the
RFID tags being disposed at a corresponding passive optical network
component, each of the RFID tags containing data that relates to at
least one property of the corresponding passive optical network
component; and at least one RFID tag reader adapted to read the
data relating to the corresponding passive optical network
component.
12. The system of claim 11, wherein the network components include
fiber drop terminals.
13. The system of claim 12, wherein the fiber drop terminals may be
used to stage a PON cabling system near premises locations.
14. The system of claim 11, wherein the property of the
corresponding passive optical network component includes
subscribers associated with output receptacles of the corresponding
passive optical network component.
15. The system of claim 11, wherein the property of the
corresponding passive optical network component includes central
offices supplying data to the corresponding passive optical network
component.
16. The system of claim 11, wherein the property of the
corresponding passive optical network component includes
information associated with maintenance of the corresponding
passive optical network component.
17. The system of claim 11, wherein the property of the
corresponding passive optical network component includes a
geographical location of the corresponding passive optical network
component.
18. The system of claim 11, wherein the RFID tag reader is
configured to store new information in each RFID tag to reflect a
status and configuration of the corresponding passive optical
network component.
19. The system of claim 11, wherein the passive optical network
component is configured to receive at the optical signals carried
on one or more optical fibers and to route the optical signals to
end user premises.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of application Ser. No.
13/335,469, filed Dec. 22, 2011, which is a continuation of
application Ser. No. 12/841,879, filed Jul. 22, 2010, now
abandoned, which is a continuation of application Ser. No.
12/370,340, filed Feb. 12, 2009, now U.S. Pat. No. 7,805,044, which
is a continuation of application Ser. No. 12/035,674, filed Feb.
22, 2008, now U.S. Pat. No. 7,627,222, which is a continuation of
application Ser. No. 11/198,848, filed Aug. 8, 2005, now U.S. Pat.
No. 7,489,849, which claims the benefit of provisional application
Ser. No. 60/624,582, filed Nov. 3, 2004, which applications are
incorporated herein by reference in their entirety.
FIELD
[0002] The present invention relates generally to communication
networks and, more particularly, to fiber drop terminals for use in
optical communications networks.
BACKGROUND
[0003] Residential, corporate, government, educational, and
institutional users of communication services may desire high
bandwidth connections to a communications network in order to send
and receive data at high rates of speed. High bandwidth
communications may allow users to take advantage of advanced
communication capabilities, such as voice-over-internet protocol
(VoIP) communications, interactive gaming, delivery of high
resolution video, such as high definition television (HDTV), as
well as the transmission and/or reception of large data files.
[0004] Communication service providers, such as telephone
companies, cable television companies, etc., may understand that
customers want these high bandwidth applications and/or services at
a reasonable cost. Past attempts at providing high bandwidth
communication channels have included techniques such as integrated
services digital network (ISDN), digital subscriber line (DSL),
asynchronous digital subscriber line (ASDL) and cable television
co-axial cable. Technologies such as these may provide broadband
capabilities to an extent. For example, some DSL services may
provide up to approximately 5 Mbits/sec of data. Users may,
however, demand even higher bandwidths. The above technologies may
have inadequate bandwidth for some users and/or these technologies
may be relatively expensive to deploy and/or maintain.
[0005] Demand for higher bandwidth services, e.g., on the order of
up to 500 Mbits/sec or even higher, may cause service providers to
look at newer technologies. One such technology is referred to as
passive optical networks (PONS). PONS may use optical fibers
deployed between a service provider central office, or head end,
and one or more end user premises. A service provider may employ a
central office, or head end, containing electronic equipment for
placing signals onto optical fibers running to user premises. End
user premises may employ equipment for receiving optical signals
from the optical fibers. In PONS, the central office, or head end,
transmission equipment and/or the transmission equipment located at
the end user premises may, respectively, use a laser to inject data
onto a fiber in a manner that may not require the use of any active
components, such as amplifiers between the central office, or head
end, and/or the end user premises. In other words, only passive
optical components, such as splitters, optical fibers, connectors
and/or splices, may be used between a service provider and an end
user premises in PONS. PONS may be attractive to service providers
because passive networks may be less costly to maintain and/or
operate as compared to active optical networks and/or older copper
based networks, such as a public switched telephone network (PSTN).
In addition to possibly being less expensive than other network
topologies, PONS may provide sufficient bandwidth to meet a
majority of end users' high bandwidth communication needs into the
foreseeable future.
[0006] In PONS, transmission equipment may transmit signals
containing voice, data and/or video over a fiber strand to the
premises. An optical fiber may be split using, for example, passive
optical splitters so that signals are dispersed from one fiber (the
input fiber) to multiple output fibers running to, for example,
user premises from a convergence point in the network. An optical
fiber routed to a user's premises may be routed via a fiber drop
terminal en route to the premises. At the fiber drop terminal,
signals appearing on one or more optical fibers may be routed to
one or more end user premises. Fiber drop terminals may be mounted
in aerial applications, such as near the tops of utility poles,
along multi-fiber and/or multi-conductor copper strands suspended
between utility poles. Fiber drop terminals may also be installed
in junction boxes mounted at ground level and/or in below-grade
vaults where utilities are run below ground.
[0007] Fiber drop terminals may be made of injection molded plastic
to keep per unit costs as low as possible. Since fiber drop
terminals may be exposed to the elements, they may be resistant to
water infiltration and/or degradation due to ultraviolet (UV)
light. Fiber drop terminal enclosures may be fabricated from UV
resistant plastic and/or equipped with gaskets to prevent water
infiltration. At times, the plastic used for the enclosure may
fatigue and/or crack leading to water and/or water vapor
penetration into the interior of the enclosure. The design of
existing enclosure mating surfaces, such as gasketed interfaces,
may interact in a manner facilitating water and/or water vapor
penetration. For example, gasket material may be of an inadequate
durometer to provide a weather-tight seal between an enclosure body
and/or an enclosure base.
[0008] Existing fiber drop terminals may not have sufficient
interior space to allow fibers within the enclosures to bend with a
radius of at least an industry and/or manufacturer recommended
minimum bend radius. When optical fibers are bent with a radius of
less than an industry and/or manufacturer recommended minimum, such
as 1.75 inches, optical signal losses may result.
[0009] Existing fiber drop terminals may have connector
orientations that do not facilitate unencumbered and/or ergonomic
coupling and/or decoupling of optical fibers/connectors by service
and installation personnel (hereafter linesmen). As a result, it
may be difficult for a linesman to attach and/or remove connectors
in certain situations, such as when servicing a fiber drop terminal
mounted on a utility pole using, for example, a ladder and/or a
bucket lift.
[0010] When fiber drop terminals are deployed in the field, they
may need to be tested prior to connecting subscribers to
communication services delivered via the fiber drop terminals.
Testing may be required to confirm that optical fibers coupled to
the fiber drop terminal are operating properly and that connectors
and/or receptacles associated with the fiber drop terminal are
installed and/or operating correctly. Testing may be performed by
injecting a signal onto a fiber at a central office and measuring
the signal with a detector at a fiber drop terminal. A linesman may
inject a signal onto a fiber at a central office and then drive to
a location having a fiber drop terminal. The linesman may climb a
pole and connect a detector to an output receptacle on the fiber
drop terminal. The linesman may determine if the signal has a
desired signal-to-noise ratio. After making the measurement, the
linesman may drive back to the central office and connect the test
signal to another fiber associated with the fiber drop terminal.
The linesman may again drive to the terminal and detect the test
signal. If a fiber drop terminal has, for example, eight output
receptacles, the linesman may repeat the drive to and from the drop
terminal eight times. Testing fiber drop terminals using known
techniques may be labor intensive and may consume a lot of fuel due
to the back and forth trips between the central office and fiber
drop terminal locations.
SUMMARY
[0011] In accordance with an implementation, a fiber drop terminal
may be provided. The fiber drop terminal may include a housing
having an outer surface containing a plurality of receptacles,
where the housing further has an inner cavity. The fiber drop
terminal may include a storage cavity occupying a portion of the
inner cavity, where the storage cavity being configured to store a
plurality of fiber coils at an angle with respect to the outer
surface.
[0012] In accordance with another implementation, a fiber drop
terminal is provided. The fiber drop terminal may include a first
face having a first plurality of output receptacles having a first
mounting angle with respect to the first face. The fiber drop
terminal may include a second face having a second plurality of
output receptacles having a second mounting angle with respect to
the second face. The fiber drop terminal may include a mating angle
formed by an intersection of the first face and the second face,
where the mating angle facilitate access to the first and second
plurality of output receptacles.
[0013] In accordance with yet another implementation, a fiber drop
terminal is provided. The fiber drop terminal may include a housing
that includes a first receptacle support face for receiving a first
output receptacle, having a lower edge; a second receptacle support
face for receiving a second output receptacle, and having an upper
edge; a transition portion located between the lower edge and the
upper edge, where the transition portion forms a valley area at the
connection with the lower edge; and a gusset contacting the lower
edge, the valley and the transition portion, where the gusset is
further configured to reinforce the valley area.
[0014] In accordance with still another implementation, a
cylindrical fiber drop terminal is provided. The cylindrical fiber
drop terminal may include an input section having an input channel
for receiving an incoming fiber bundle having a plurality of input
optical fibers, where the input section further has an input
section mating surface and an inner cavity. The cylindrical fiber
drop terminal may include a first output section having a first
plurality of output receptacles. The first output section may
further have a first mating surface for mating with the input
section mating surface, a second mating surface, and a first inner
cavity. The cylindrical fiber drop terminal may include an end cap
section having a second inner cavity for storing fiber coils and
further having an end cap mating surface for mating with the second
mating surface.
[0015] In accordance with yet another implementation, a fiber drop
terminal is provided. The fiber drop terminal may include means for
receiving an incoming optical signal; means for storing optical
fiber at an angled orientation within the fiber drop terminal; and
means for making the incoming optical signal available to
premises.
DRAWINGS
[0016] The accompanying drawings, which are incorporated in and
constitute a part of this specification, illustrate an embodiment
of the invention and, together with the description, explain the
invention. In the drawings,
[0017] FIG. 1 illustrates a first schematic representation of an
exemplary broadband access network that may include passive optical
network (PON) components in an implementation consistent with the
principles of the invention;
[0018] FIG. 2 illustrates a second schematic representation of an
exemplary broadband access network that may employ fiber to the
premises (FTTP) and/or PON components in an implementation
consistent with the principles of the invention;
[0019] FIG. 3A illustrates an exemplary implementation of a fiber
drop terminal that may include a stepped face, consistent with the
principles of the invention;
[0020] FIG. 3B illustrates a cut away view of the exemplary
implementation the housing illustrated in FIG. 3A, consistent with
the principles of the invention;
[0021] FIG. 4 illustrates a view of an interior cavity associated
with an exemplary implementation of a fiber drop terminal employing
an angled fiber management cavity, consistent with the principles
of the invention;
[0022] FIG. 5 illustrates a cross-section of an exemplary
implementation of a fiber drop terminal housing employing a fiber
management cavity for storing fiber coils at an angled orientation,
consistent with the principles of the invention;
[0023] FIG. 6 illustrates an exemplary implementation of a fiber
retention device in accordance with an implementation consistent
with the principles of the invention;
[0024] FIG. 7A illustrates an exemplary implementation of a fiber
drop terminal that may include a fiber input channel located in a
lower portion of the terminal, consistent with the principles of
the invention;
[0025] FIG. 7B illustrates an exemplary implementation of a fiber
drop terminal including a fiber input channel located in an upper
portion of the terminal, consistent with the principles of the
invention;
[0026] FIGS. 8A and 8B illustrate the exemplary implementations of
FIGS. 7A and 7B, respectively, in combination with ruggedized
multi-fiber input connectors to facilitate a removable
interconnection between an incoming fiber bundle and/or an output
connector, consistent with the principles of the invention;
[0027] FIG. 8C illustrates an overhead view of an exemplary
implementation of the fiber drop terminal of FIG. 8A and/or 8B
showing fiber retention and/or routing techniques that may be
employed within the terminals, respectively, consistent with the
principles of the invention;
[0028] FIGS. 9A and 9B illustrate an exemplary implementation of a
fiber drop terminal having a reinforced housing that may include
reinforcing gussets at locations that may be associated with
regions of adverse stress, consistent with the principles of the
invention;
[0029] FIG. 10A illustrates an exemplary implementation of an
enclosure mating surface utilizing a gasket device to facilitate a
weatherproof seal between a housing and a base, consistent with the
principles of the invention;
[0030] FIG. 10B illustrates the mating surface of the exemplary
implementation of FIG. 10A in greater detail, consistent with the
principles of the invention;
[0031] FIG. 11A illustrates an exemplary implementation of a
mounting bracket that may be used to attach an implementation of a
fiber drop terminal to a substantially vertical surface, consistent
with the principles of the invention;
[0032] FIG. 11B illustrates an exemplary implementation of a fiber
drop terminal mounted to a substantially vertical surface via the
mounting bracket illustrated in FIG. 11A, consistent with the
principles of the invention;
[0033] FIG. 11C illustrates an exemplary technique for attaching
the fiber drop terminal of FIG. 11B to the bracket of FIG. 11A,
consistent with the principles of the invention;
[0034] FIG. 11D illustrates an exemplary implementation of a base
module having self-alignment channels to facilitate self-alignment
of a fiber drop terminal with a mounting bracket, consistent with
the principles of the invention;
[0035] FIG. 11E illustrates the exemplary enclosure of FIG. 11B
along with an exemplary implementation of a top entry fiber optic
connector, consistent with the principles of the invention;
[0036] FIG. 11F illustrates the exemplary enclosure of FIG. 11B
along with an exemplary implementation of a bottom entry fiber
optic connector, consistent with the principles of the
invention;
[0037] FIG. 12A illustrates a first exemplary implementation of a
fiber drop terminal that may include pry tabs for facilitating
removal of an enclosure housing from a base, consistent with the
principles of the invention;
[0038] FIG. 12B illustrates a second exemplary implementation of a
fiber drop terminal employing pry tabs, consistent with the
principles of the invention;
[0039] FIG. 13 illustrates an exemplary implementation of a fiber
drop terminal including recessed pockets for supporting output
receptacles that may be adapted to receive output connectors,
consistent with the principles of the invention;
[0040] FIGS. 14A-C illustrate various aspects of an exemplary
implementation of a fiber drop terminal 1400 having tiered
receptacles mounted on faces having an angular association with
each other, consistent with the principles of the invention;
[0041] FIG. 15 illustrates an exemplary implementation of a fiber
drop terminal having output receptacles and contoured surfaces
associated with receptacle pocket areas, consistent with the
principles of the invention;
[0042] FIG. 16 illustrates an exemplary implementation of a fiber
drop terminal employing a cylindrical enclosure, consistent with
the principles of the invention;
[0043] FIG. 17A illustrates an implementation of a fiber drop
terminal 1700 employing loop back-plugs, consistent with the
principles of the invention;
[0044] FIG. 17B illustrates an exemplary flow diagram illustrating
a method for testing a fiber drop terminal used in a communication
network consistent with the principles of the invention;
[0045] FIG. 18 illustrates a flow chart showing an exemplary method
for routing fiber strands within a fiber drop terminal employing an
angled fiber management system, consistent with the principles of
the invention;
[0046] FIG. 19 illustrates a flow chart showing an exemplary method
for installing a fiber drop terminal using a bracket, consistent
with the principles of the invention; and
[0047] FIG. 20 illustrates a flow chart showing an exemplary method
for installing fiber drop terminals and/or output connectors onto a
multi-fiber strand prior to deployment in the field, consistent
with the principles of the invention.
DETAILED DESCRIPTION
[0048] Reference will now be made in detail to exemplary
implementations of the present invention, examples of which are
illustrated in the accompanying drawings. While exemplary
implementations are provided, other implementations are possible in
light of the specification. As such, changes may be made to the
exemplary implementations described herein without departing from
the spirit and scope of the invention. The following detailed
description does not limit the invention; but instead, the scope of
the invention is defined by the appended claims and their
equivalents. Wherever possible, the same reference numbers may be
used throughout the drawings to refer to the same or like
parts.
[0049] FIG. 1 illustrates a first schematic representation of an
exemplary broadband access network 100 that may include PON
components in an implementation consistent with the principles of
the invention. Network 100 may include an optical line terminal
(OLT) 102, a voice input 104, a data input 106, a video input 108,
a wavelength division multiplexed (WDM) fiber 110, a passive
optical splitter (POS) 112, a fiber distribution hub (FDH) 114,
optical network terminals (ONTs) 116 and 118, a residence 120, and
an office building 122.
[0050] OLT 102 may include any device capable of placing data onto
one or more optical fibers. For example, OLT 102 may include a head
end controller adapted to inject signals onto one or more optical
fibers. Network 100 may employ OLT 102 for receiving input data
from one or more service networks. By way of example, OLT 102 may
receive voice input 104, data input 106 and/or video input 108 from
one or more service networks associated with, for example, a
telecommunications provider, a multi-media provider, and/or a cable
television provider. OLT 102 may queue and/or output a multiplexed
data stream over one or more optical fibers 110. For example, an
exemplary implementation of OLT 102 may output voice at a
wavelength on the order of 1490 nanometers (nm), data at a
wavelength on the order of 1310 nm and/or video at a wavelength on
the order of 1550 nm.
[0051] WDM fiber 110 may include any medium capable of carrying
optical signals from a source to a destination. WDM fiber 110 may
transport data from a proximal, or input, end using techniques,
such as WDM, to a distal, or output, end. POS 112 may include any
device capable of accepting an incoming optical signal and
splitting the optical signal into two or more output signals. POS
112 may receive data by way of a single fiber (the input fiber) and
split the data across two or more output fibers. For example, POS
112 may split incoming data across 2, 4, 8, 16, 32, or more output
fibers. In an exemplary implementation, each output fiber is
associated with an end user, such as a residence 120 and/or a
commercial end user in office building 122. POS 112 may be located
in both indoor and outdoor environments. For example, POS 112 may
be located in a central office/head end, environmentally secure
cabinets, and/or in outdoor enclosures such as fiber drop
terminals. In one implementation, POS 112 may include optical
splitters that are prepackaged in optical splitter module housings.
Packaging POS 112 in an optical splitter cassette, or housing, may
provide protective packaging to facilitate easy handling of
otherwise fragile splitter components by linesmen. An optical
splitter cassette may include any device capable of housing one or
more assemblies used for splicing an incoming fiber into two or
more outgoing fibers.
[0052] FDH 114 may include any device capable of housing POS 112.
For example, in one implementation, FDH 114 may include a
re-enterable weather tight enclosure capable of holding one or more
POSs 112. Exemplary implementations of FDH 114 are described in
pending U.S. patent application Ser. No. 10/714,814 entitled
Systems and Methods for Fiber Distribution and Management, filed on
Nov. 17, 2003, and U.S. patent application Ser. No. 10/991,135
entitled Systems and Methods for Optical Fiber Distribution and
Management, filed on Nov. 17, 2004, the entire contents of which
are, respectively, hereby incorporated by reference herein.
Implementations of FDH 114 may allow easy re-entry by linesmen
and/or other service personnel. A linesman may access FDH 114 to
install one or more POSs 112, to make fiber connections available
to a subscriber, and/or to troubleshoot POS 112. For example, POS
112 may be mounted in FDH 114 using cassettes operating in
conjunction with a fiber patch panel to facilitate routing of fiber
jumpers. Fiber jumpers may be used to connect the splitter outputs
of POS 112 to one or more subscriber ports on the fiber patch
panel. A subscriber port may facilitate connection of an optical
signal from a central office and/or head end to a customer
premises. FDH 114 may, for example, serve on the order of 144 to
432 splitter ports and/or premises, and may include multiple
distribution cables, connectorized and/or fusion spliced between
OLT 102 and POS 112 located within, for example, FDH 114.
[0053] Network 100 may be designed to achieve low optical insertion
loss in order to achieve maximum network reach from electronics
having fixed power output. Each optical component and subsystem
utilized in the network may be optimized to provide minimum
insertion loss. For example, an optical loss budget in an exemplary
implementation may be approximately 23 to 25 dB with 1:32 passive
splitting. The components and factors contributing to the optical
loss may include splitters (1:32, single or cascaded), WDMs,
connectors such as to OLT 102, POS 112, a fiber patch panel, a
fiber drop, and/or ONT 116, 118, fiber attenuation at various
frequencies, such as, wavelengths of 1310 nm, 1490 nm, and/or 1550
nm, and/or fiber splices.
[0054] ONTs 116, 118 may include any device capable of receiving an
incoming optical signal and making it available to a destination.
For example, and end user location, such as residence 120, may use
ONT 116 to receive a multiplexed incoming optical signal and make
it available to an end user device, such as a computer. In one
implementation, ONT 116 may act as a demultiplexer by accepting a
multiplexed data stream containing voice, video, and/or data. ONT
116 may demultiplex the incoming data stream and provide a separate
voice channel to a user's telephone, a separate video channel to a
television set, and/or a separate data channel to a computer.
[0055] FIG. 2 illustrates a second schematic representation of an
exemplary broadband access network 200 that may employ FTTP and/or
PON components in an implementation consistent with the principles
of the invention. Network 200 may include a circuit switch/OLT 202,
a service area interface (SAI) 204, a splitter hub 206, one or more
residential ONTs 208, one or more small business ONTs 210, one or
more office park ONTs 212, FTTP 214, utility pole 216, downstream
splitter 218, and fiber drop terminal 220. Circuit switch/OLT 202
may include central office equipment for placing optical signals
onto FTTP 214. For example, circuit switch/OLT 202 may convert
analog signals associated with a PSTN to optical signals that are
conveyed to FTTP 214. SAI 204 may include any device capable of
splitting an incoming signal into multiple outgoing signals. For
example, SAI 204 may receive an optical fiber from circuit
switch/ONT 202. SAI 204 may split data on the incoming fiber into
multiple outgoing data flows on a like number of outgoing optical
fibers. SAI 204 may split an incoming signal into, for example, 32
output signals using a 1.times.32 splitter. Splitter hub 206 may
include any device capable of retaining SAI 204. For example,
splitter hub 206 may be implemented as FDH 114 as discussed in
conjunction with FIG. 1.
[0056] Residential ONT 208 may include any device capable of
receiving an incoming optical signal and making it available to a
destination. Residential ONT 208 may operate in a manner similar to
ONTs 116 and 118 described in conjunction with FIG. 1. Small
business ONT 210 may include any device capable of receiving an
incoming optical signal and making it available to a destination,
such as a small business. Small business ONT 210 may serve a single
small business and/or may serve a group of small businesses, such
as businesses co-located in a strip mall and/or small commercial
building. Office park ONT 212 may include any device capable of
receiving an incoming optical signal and making it available to a
destination. Office park ONT 212 may operate to serve an office
park including one or more buildings and/or offices.
[0057] Optical signals may be conveyed from SAI 204 and/or splitter
hub 206 by FTTP 214. FTTP 214 may include one or more optical media
capable of conveying optical signals from a source to a
destination. Optical media may include optical fibers. Optical
fibers used in outdoor installations may include a protective
sheath surrounding the optical medium to provide rigidity,
strength, durability, color coding, strain relief and/or protection
from the elements such as water and/or UV radiation.
[0058] FTTP 214 may include a single fiber and/or multiple fibers.
When FTTP 214 includes multiple fibers, the multiple fibers may be
deployed in a multi-fiber strand, or bundle, surrounded by a
protective bundle-sheath. The bundle-sheath may operate to provide
rigidity, strength, durability, color coding, strain relief and/or
protection from the elements such as water and/or UV radiation.
Bundled fibers may include breakouts at determined locations.
Breakout refers to a location on a bundle-sheath where one or more
optical fibers exit the interior portion of the bundle-sheath and
are made available to other devices, such as residential ONT 208,
small business ONT 210, office park ONT 212 and/or fiber drop
terminal 220.
[0059] FTTP 214 may be suspended above grade using one or more
utility poles 216. Utility pole 216 may include any device capable
of supporting an optical fiber. Utility pole 216 may include
conventional utility poles and/or optical fiber supporting devices
used on structures, such as the exterior surfaces of buildings. A
fiber drop terminal 220 may be used in conjunction with utility
pole 216. Utility pole 216 may be used to support conventional
copper wire strands such as those used for plain old telephone
service (POTS), those used for cable television (CATV) and/or FTTP
214.
[0060] Network 200 may include one or more downstream splitters
218. A down stream splitter 218 may include any device capable of
splitting an incoming optical signal into two or more outgoing
optical signals. Downstream splitter 218 may include a reduced
splitting capacity as compared to splitter hub 206. For example,
downstream splitter 218 may include a 1.times.2, 1.times.4 and/or
1.times.8 splitter. Downstream splitter 218 may include passive
and/or active splitting devices operating alone or on combination.
In one implementation, downstream splitter 218 may be incorporated
into fiber drop terminal 220.
[0061] Fiber drop terminal 220 may include any device capable of
receiving one or more input fibers and distributing optical
communication signals traversing the input fibers to one or more
output fibers. Fiber drop terminals 220, consistent with
implementations of the invention, are used to interface between
distribution cables and drop cables in a PON application. Fiber
drop terminal 220 may be manufactured from injection molded plastic
and may include an enclosure body, or housing, and a base. Fiber
drop terminal 220 may be configured by splicing a multi-fiber cable
at a branch, or breakout, point. For example, a large fiber count
distribution cable may be spliced to obtain eight fibers to connect
to a fiber drop terminal having eight output receptacles. A single
cable having one or more optical fibers therein may depart the
splice location and serve as an input, or feed, cable to fiber drop
terminal 220. By way of example, a feed cable may have a central
tube housing a plurality of individual optical fibers. Inside fiber
drop terminal 220, the multi-fiber feed cable may be separated into
individual fibers and then terminated on individual rugged outdoor
receptacles, connectors and/or adapters located on an exterior
surface of the enclosure. Fiber drop terminal 220 may thus used to
stage the PON cabling system near premises locations, such as a
residence 120 or office building 122, so that when a subscriber
requests service, a simple connectorized drop cable can be quickly
and easily connected between fiber drop terminal 220 and circuit
switch/ONT 202 and a customer premises.
[0062] Fiber drop terminal 220 may also be coupled to a feed cable
at a manufacturing or assembly plant. For example, fiber drop
terminal 220 may be installed on a multi-fiber stranded feed cable
at a predetermined location. In another implementation, a breakout
may be terminated with an input connector at a manufacturing plant.
In the field, a fiber drop terminal 220 may be attached to the
input connector via an input receptacle. Implementations of fiber
drop terminal 220 may take many forms. Several exemplary
implementations are described herein.
[0063] The network architecture described in conjunction with FIGS.
1 and 2 may operate in a point to multi-point PON configuration
utilizing, for example, 1:32 splitters at FDH 114 or splitter hub
206. The network architecture may be fiber rich, such as in a 1:1
distribution arrangement between FDH 114 and a customer's premise,
such as residence 120, and/or the network architecture can be
diluted, such as in a 1:X arrangement where X is an integer larger
than 1.
[0064] The broadband services capability of network 100 and/or
network 200 for distributing source information may include data
signals, at for example 622 Mbps.times.155 Mbps (shared), video
signals, at for example 860 MHz for approximately 600 analog and/or
digital channels and/or high definition television (HDTV), and/or
video on demand (VOD). Source information may consist of data, such
as, voice, video, text, still images, numerical data and/or control
data. Source information may originate at a source location, such
as a telecommunications service provider (hereinafter service
provider). Signaling may be accomplished using WDM and/or fiber
sharing. Network 100 may include ONTs 116 and 118 that are
scalable, provide high bandwidth, and/or support multi-service
applications that can service residences and/or small to medium
sized businesses. Multiple ONTs 116 and 118 may be operated in
parallel to provide greater overall bandwidth to a destination,
such as a large office building. Network 100 may include passive
components that are located outside the plant, i.e., outside the
service provider's building, and require minimal maintenance, since
active components, such as amplifiers, may not be required.
[0065] Implementations of networks 100 and/or 200 may include
digital subscriber plug-in line cards having a broadband terminal
adapters configured to receive digitally multiplexed broadband data
streams and output one or more demultiplexed broadband data streams
for one or more subscriber loops.
[0066] FIG. 3A illustrates an exemplary implementation of a fiber
drop terminal 300 that may include a stepped face, consistent with
the principles of the invention. Stepped face terminal 300 may
include a base 302, a fastener guide 304, a housing 306 having a
fiber management portion 308, one or more output receptacles
310A-D, an output connector 312, an output fiber 314, an input
channel 316, and an incoming fiber bundle 318.
[0067] Terminal 300 may be deployed in a number of installed
environments including aerial (such as near the top of a utility
pole), pedestal (such as cabinets accessible when standing on
grade), and/or below grade (such as in below grade vaults and/or
sealed enclosures). Terminal 300 may consist of two molded plastic
enclosure parts separated by a flexible sealing interface that
operates to seal an internal cavity against the elements. For
example, terminal may consist of base 302 and housing, or body,
306.
[0068] Terminal 300 may include base 302 that can be releasably
attached to housing 306 using, for example, fasteners, keyed
retainers, clamping devices, etc. Base 302 may include a
substantially flat shape configured to retain a gasket and/or other
sealing device along a base mounting surface that may be releasably
coupled to a corresponding housing mounting surface associated with
housing 306. Base 302 may be adapted for attachment to a surface,
such as a utility pole, using fasteners, such as nails, and/or
screws, via fastener guide 304.
[0069] Housing 306 may be shaped so as to form a cavity for housing
optical fibers. Housing 306 may include an outer surface having
penetrations passing therethrough for receiving, for example,
output receptacles 310A-D. Housing 306 may be shaped so that an
upper surface of base 302 operates to form an enclosed area in
conjunction with the cavity when coupled to housing 306 along a
gasketed interface. Housing 306 may be configured so that a portion
of the inner cavity operates as a fiber management portion 308 for
storing excess optical fiber. In one implementation, housing 306
may be configured to have a depth 320 sufficient to allow storage
of fiber coils in an angular orientation so as to facilitate
maintaining a determined minimum bend radius. For example, fiber
management portion 308 may be configured to retain fiber coils with
a bend radius meeting at least a manufacturer recommended minimum
bend radius.
[0070] PON fiber drop terminals similar to those shown in FIG. 3A
may be used to provide a breakout of multiple fiber cable
containing, for example, 4, 6, 8 and/or 12 fibers into individual
rugged outdoor connector-adapters. The breakout of the fibers
inside terminal 300 may be performed by placing bends on the
individual fibers within the enclosure.
[0071] Terminal 300 may include an enlarged fiber management
portion 308. Use of an enlarged fiber management portion 308
ensures that fibers are not adversely impinged by the interior
walls of the enclosure. The enlarged fiber management portion 308
allows at least one path for a fiber which meets a manufacturer's
minimum recommended bend radius for the fiber. A manufacturer's
minimum recommended, or specified, bend radius refers to a
parameter disseminated to the industry for particular types of
optical fibers. This parameter identifies a recommended minimum
bend radius for a given fiber. If a minimum bend radius is
exceeded, excess signal loss may occur resulting in a reduced
signal-to-noise ratio at a receiving device. For example, if a
manufacturer specifies a minimum bend radius as 1.5 inches, the
bend radius is exceeded when an optical fiber is bent such that the
bend radius is less than 1.5 inches, such as would occur if a bend
radius of 1.4 inches were used. Since signal loss may increase
exponentially when the minimum bend radius is exceeded, care should
be taken to maintain at least the minimum specified bend
radius.
[0072] By increasing the depth 320 of terminal 300, a path exists
within the enclosure for a coil to be installed at an angle that
meets the minimum bend radius criteria and therefore eliminates the
risk of increased signal attenuation due to excessive fiber
bending. By using fiber retaining mechanisms, such as hooks (shown
in FIG. 6), the coil can be organized and retained at a proper
radius without losing the organization of the coils. Depth 320 may
be altered as needed to achieve a desired bend radius for fiber
coils arranged therein.
[0073] Implementations of terminal 300 may have the following
exemplary dimensions: for a 4 output enclosure, 3'' (76.2 mm)
deep.times.3.6'' (91.4 mm) wide.times.11.1'' (281.9 mm) long; for a
6 or 8 output enclosure, 3'' (76.2 mm) deep.times.3.6'' (91.4 mm)
wide.times.16.6'' (421.6 mm) long; and for a 12 output enclosure,
3'' (76.2 mm) deep.times.3.6'' (91.4 mm) wide.times.22.7'' (576.6
mm) long.
[0074] Output receptacles 310A-D may include any device capable of
receiving a connector. For example, output receptacle 310 may
convey optical data received via incoming fiber bundle 318 to an
output fiber 314. For example, output receptacles 310A-D may
provide a rugged exterior package that houses a ferrule alignment
sleeve for the purpose of mating two fiber optic connectors. Output
receptacles 310 may include a fiber optic connector consisting of
an interior SC/APC (angled physical contact) that is connected to a
single optical fiber. The optical fiber may be over-tubed with a
900 .mu.m (nine-hundred micron) diameter clear and/or color coded
tubing material to protect the waveguide portion of the fiber that
carries the optical signal. The interior SC/APC connector may
releasably mate with output connector 312. Output receptacles
310A-D may be plugged when not in use so as to prevent dirt and
moisture from accumulating on a fiber within an output
receptacle.
[0075] Output connector 312 may include a modified SC/APC connector
that has been strengthened to increase its durability to meet, for
example, outdoor environments. For example, output connector 312
may include modifications to provide weather and UV protection to
an optical fiber inside the connector. Output connector 312 may
also be adapted to increase the pull-out force of the fiber from
the connector and/or connector from a receptacle to a value of 100
pounds or more. By way of example, a pull out strength for a
typical SC/APC connector may be on the order of 3 to 4 pounds.
Employing implementations of output connector 312 may significantly
improve pull out resistance as compared to that of conventional
SC/APC connectors. Output connector 312 and output receptacle 310
may form a watertight assembly when coupled together using, for
example, threaded sleeves. In one implementation, output connector
312 and/or output receptacle 310 are equipped with o-rings to
provide radial seals within each receptacle when mated to output
connector 312. Output receptacles 310 may also be equipped with one
or more o-rings proximate to an interface between output
receptacles 310 and housing 306.
[0076] Examples of connectors and/or receptacles that can be used
with implementations of fiber drop terminals described herein are,
but are not limited to, those described in U.S. Pat. No. 6,648,520
B2 entitled Fiber Optic Plug and U.S. Pat. No. 6,579,014 B2
entitled Fiber Optic Receptacle, each of these patents is hereby
incorporated by reference herein in its respective entirety.
[0077] Incoming fiber bundle 318 may include one or more input
optical fibers enclosed within a protective sheath, or tube, for
coupling incoming optical signals with output connector 312 via
output receptacle 310. For example, if terminal 300 includes four
receptacles, incoming fiber bundle 318 may include four optical
fibers. An incoming optical fiber may be associated with a
particular output receptacle. The quantity of fibers within
incoming fiber bundle 318 may match the number of receptacles
310A-D, may exceed the number of receptacles 310A-D, and/or may be
fewer than the number of receptacles 310A-D. Individual optical
fibers within an incoming fiber bundle 318 may be adapted for
outdoor applications using 900 .mu.m clear and/or color coded
tubing for protection. The incoming fibers may terminate with an
industry standard SC/APC connector.
[0078] Incoming bundle 318 may enter terminal 300 by way of input
channel 316. Input channel 316 may consist of a passage or tubular
entrance through which bundle 318 may pass. Individual fibers may
be fanned out from incoming bundle once inside the inner cavity of
terminal 300. Incoming bundle 318 may be sealed to input channel
316 using, for example, potting techniques know in the art. Input
channel 316 may be adapted to receive an input receptacle for
receiving incoming fibers. When input channel 316 is adapted with a
receptacle, incoming bundle 318 may be terminated with a mating
input connector for coupling optical signals to the input
receptacle and/or to output receptacle 310.
[0079] FIG. 3B illustrates a cut away view of the exemplary
implementation of the housing illustrated in FIG. 3A, consistent
with the principles of the invention. Housing 306 may be configured
with a stepped face for mounting connector receptacles. Housing 306
may include a storage cavity 330, a first stepped face 332, a first
transition region 334, a second stepped face 336, a second
transition region 338, a first inside angle 340, a second inside
angle 342 and a retainer mounting channel 344. First applied force
346, second applied force 348, and third applied force 350 may
represent forces associated with mounting terminal 300.
[0080] Storage cavity 330 may occupy a portion of the interior of
housing 306 and may be used for storing excess optical fiber. For
example, storage cavity 330 may be located in an upper portion of
the interior of housing 306 and may be sized for storing coiled
optical fibers. Storage cavity 330 may be used for maintaining
excess optical fiber in an organized manner that facilitates
efficient configuration and assembly of terminal 300.
[0081] First stepped face 332 and second stepped face 336 may be
configured to receive output receptacle 310. First stepped face 332
and second stepped face 336 may operate as output receptacle
support surfaces. First stepped face 332 and second stepped face
336 may be arranged with respect to first transition region 334 and
second transition region 338, respectively, so as to maintain
output receptacle 310 at a determined relationship, or orientation,
with respect to housing 306 and or a mounting location, such as a
utility pole. First inside angle 340 may operate with first stepped
face 332 and first transition region 334 to establish the
predetermined orientation for a output receptacle 310 installed
therein. Second inside angle 342 may operate with second stepped
face 336 and second transition region 338 to establish the
predetermined orientation for an output receptacle 310 installed
therein. The predetermined orientation for receptacles in first
stepped face 332 and second stepped face 336 may be substantially
similar or they may be different. For example, housing 306 may be
associated with base 302 and mounted to a utility pole. It may be
determined that linesmen will approach housing 306 via a ladder.
First stepped face 332 and second stepped face 336 may be
configured so that receptacles mounted therein are aligned to
provide a linesman with an ergonomic and/or readily visible access
to output receptacle 310 when attaching an output connector 312
and/or output fiber 314.
[0082] Housing 306 may include one or more retainer mounting
channels 344 for adjustably retaining fiber retention devices, such
as hooks, clamps, cable ties, etc. For example, retainer channel
344 may facilitate a height adjustment with a fiber retaining hook
used to retain excess optical fiber in coils within the inner
cavity of housing 306.
[0083] Housing 306 may be subject to one or more applied forces
when attached to a base, such as base 302, using attachment
devices, such as fasteners. For example, first applied force 346,
second applied force 348 and/or third applied force 350 may result
from attaching housing 306 to base 302 using screws. Housing 306
may be adapted to reduce the detrimental effects of applied bending
forces by, for example, reinforcing first inside angle 340 and/or
second inside angle 342. For example, the thickness of material in
the vicinity of first inside angle 340 and/or second inside angle
342 may be increased in order to increase the stiffness of housing
306.
[0084] FIG. 4 illustrates a view of an interior cavity associated
with an exemplary implementation of a fiber drop terminal employing
an angled fiber management cavity, consistent with the principles
of the invention. FIG. 4 illustrates the interior cavity of stepped
housing 306. The interior cavity may include an incoming fiber
group 402A-D, a first central retainer 404, a second central
retainer 406, a low elevation retainer 408, fiber coils 410, a
first high elevation retainer 412, a second high elevation retainer
414, individual fibers 402A, B, C and D, receptacle bodies 416A, B,
C and D, a gasket 418, and fiber guides 420A and 420B.
[0085] Incoming fiber group 402A-D may include individual fibers
402A, B, C and D and may be received via incoming fiber bundle 318.
First and second central retainers 404 and 406 may include any
device capable of substantially retaining one or more fibers in a
determined location. For example, first and second central
retainers 404 and 406 may releasably retain incoming fiber group
402A-D along a central portion of housing 306, such as along the
centerline of housing 306. First and second central retainers 404
and 406 may be held in place via adhesive and/or mechanical
fastening techniques. For example, first and second central
retainers 404 and 406 may employ fasteners, releasable fingers,
fiber guides, tie wraps, hooks, channels, etc., for securing
incoming fiber group 402A-D. Therefore, any device capable of
retaining a fiber at a desired location is contemplated by first
and second central retainers 404 and 406.
[0086] Excess fiber in incoming fiber group 402A-D may be stored in
one or more fiber coils 410 within housing 306. Fiber coils 410 may
be formed in cooperation with low elevation retainer 408, first
high elevation retainer 412 and second high elevation retainer 414.
Low elevation retainer 408 may include any device capable of
retaining one or more fibers at a determined location. First high
elevation retainer 412 and second high elevation retainer 414 may
include any device capable of retaining one or more optical fibers
at a determined location with respect to, for example, low
elevation retainer 408. For example, a relationship between first
high elevation retainer 412 and low elevation retainer 408 may
cause fiber coils 410 to be stored at an angular orientation within
housing 306. Fiber coils 410 may have an upper coil portion 422
and/or a lower coil portion 424 resulting from the relationship of
low elevation retainer 408 and/or first and second high elevation
retainers 412 and 414.
[0087] Housing 306 may be configured so that fiber coils 410 are
retained in a manner in accordance with a manufacturer suggested
minimum bend radius, which may be one-half of diameter 426. Assume
that a manufacturer specifies that fibers 402A-D should have a
recommended bend radius of at least 1.5 inches. Fiber management
portion 308 of housing 306 may be configured so that fiber coils
410 are retained at an angular orientation using low elevation
retainer 408 and one or more first and/or second high elevation
retainers 412 and/or 414. The angled orientation of fiber coils 410
may facilitate achieving at least the manufacturer recommended
minimum bend radius.
[0088] Fibers 402A-D may be terminated within housing 306 using,
for example, a like number of receptacle bodies 416A-D. Receptacle
bodies 416A-D may include any device capable of terminating an
optical fiber and making signals traversing the fiber available to
another device, such as a connector, and/or to a destination, such
as a user premises. Receptacle bodies 416A-D may include connectors
for mating a terminated fibers 402A-D with a receptacle body and/or
fiber 402A-D may be mated with receptacle body 410A-D using a fused
and/or adhesive based connection.
[0089] Housing 306 may include a gasket 418 located in a recess, or
channel, to facilitate a watertight seal with a base, such as base
302. Gasket 418 may include any device capable of facilitating a
moisture resistant seal with a mating surface. For example, gasket
418 may include an elastomer-like material with or without
adhesive, lubricant, and/or sealing compounds such as liquids
and/or gels.
[0090] FIG. 5 illustrates a cross-section of an exemplary
implementation of a fiber drop terminal housing 306 employing a
fiber management cavity for storing fiber coils at an angled
orientation, consistent with the principles of the invention.
Housing 306 may include components illustrated and described in
conjunction with FIGS. 3A, 3B and/or 4, such as input channel 316,
output receptacle 310, incoming fiber bundle 318, etc. Housing 306
may employ a first high elevation retainer 412 for retaining one or
more fibers 402A-D. First high elevation retainer 412 may be used
individually and/or in combination with other fiber retention
devices. First high elevation retainer 412 may be located in
storage cavity 502 and may be slideably disposed in retainer
mounting channel 344 to variably position optical fibers 402A-D
with respect to the interior of housing 306.
[0091] As shown in FIG. 5, low elevation retainer 408 may operate
with one or more high elevation retainers 412 and/or 414 to retain
fiber coils 410 at an angled orientation 506 relative to storage
cavity 502 and/or a housing face 508. The use of angled orientation
506 may facilitate storage of fiber coils 410 without violating a
manufacturer recommended bend radius. Implementations may employ
angular orientations having a wide range of angles with respect to
a reference location, such as housing face 508. In one
implementation angular orientation 506 with respect to housing face
508 may be on the order of 20.degree. to 60.degree. and in another
implementation may be on the order of 35.degree. to 45.degree..
Storing the fiber coils 410 at an angular orientation with respect
to an outer surface of fiber drop terminal 300, as opposed to a
planar orientation with respect to an outer surface of terminal
300, advantageously enables the overall dimensions of fiber drop
terminal 300 to be reduced, while maintaining a desired minimum
bend radius. The orientation of the angled fiber coil 410 may be
reversed so that the base of retainer mounting channel 344 is
associated with, for example, base 302 instead of with a face of
housing face 306. Housing 306 may include dummy plug 504 to protect
output receptacle 310 when output connector 312 is not
installed.
[0092] FIG. 6 illustrates an exemplary implementation of a fiber
retention device in accordance with an implementation consistent
with the principles of the invention. The fiber retention device of
FIG. 6 may be implemented as retainer hook 600. Retainer hook 600
may include a mounting post 602, a back face 604, a top face 606,
and a retaining face 608. Back face 604, top face 606, and
retaining face 608 may form an inner channel 610 for receiving one
or more optical fibers. Retainer hook 600 may include any device
capable of retaining one or more optical fibers in a desired
position. Retainer hook 600 may be fabricated from plastic,
composite, metal, glass, or the like depending on the desired
properties of hook 600. For example, fiber coils 410 may be placed
within inner channel 610. Fiber coils 410 may be retained using the
inner surface of retaining face 608. Tension present in fiber coils
410 may facilitate retention of fiber coils 410 within inner
channel 610. Retainer hook 600 may include mounting post 602.
Mounting post 602 may be adapted to facilitate adjusting a height
of inner channel 610 with respect to storage cavity 502 and/or
another reference location. Mounting post 602 may be slideably
disposed within retainer mounting channel 344 (FIG. 3B and FIG. 5)
for adjusting the height of inner channel 610 with respect to a
reference location.
[0093] Fiber management components, such as retainer mounting
channel 344, first central retainer 404, low elevation retainer
408, and retainer hook 600 may be fabricated from plastic,
composite, metal, rubber, and the like. In one implementation, the
fiber management components are fabricated from the same material
used to make terminal 300 so that fiber management components may
have the same thermal coefficients as, for example, base 302 and
housing 306. For example, base 302, housing 306, and/or fiber
management components may be fabricated from polypropylene.
[0094] Terminal 300 may be used in utility pole mount installations
where incoming fiber bundle 318 approaches terminal 300 via a
breakout originating from a strand located above terminal 300. In
this configuration, terminal 300 may be adapted to receive incoming
fiber bundle 318 from an input channel 316 located in an upper
portion of terminal 300. Alternatively, terminal 300 may have input
channel 316 located in a lower portion of terminal 300. When
terminal 300 is adapted for bottom entry, an input cable may need
to bypass the terminal on the pole and be looped on the pole for
entry in the bottom of the terminal. One or more output receptacles
may be arranged so as to discourage entry of precipitation as well
as for channeling water away from receptacles 310A-D. Output
receptacles 310A-D may be mounted so as to facilitate access by a
linesman having a desired angle of approach regardless of whether a
bottom entry or top entry input channel 316 is used.
[0095] As used herein, angle of approach may broadly refer to an
anticipated direction and/or angle from which a linesman will
approach and/or access terminal 300, a mounting bracket, output
receptacle 310, and/or output connector 312 when being connected to
output receptacle 310 and/or removed from output receptacle 310. An
angle of approach may vary based on a mounting location of terminal
300 (e.g., on a utility pole, pedestal, building, etc.), the
orientation of terminal 300 (e.g., horizontal mounting vs. vertical
mounting), a method of approach utilized by a linesman (e.g.,
approach by ladder, bucket lift, and/or foot), and/or a working
position taken by a linesman when interacting with terminal 300
(e.g., using one hand while the other hand holds a ladder rung,
and/or using two hands while in a bucket lift and/or while standing
on grade). In addition, the angle of approach may take into account
the size of a connector and/or cable being coupled to an input
receptacle and/or output receptacle 310, prevailing weather
patterns, aesthetic appearance of the terminal 300, the number of
connections on terminal 300, etc.
[0096] FIG. 7A illustrates an exemplary implementation of a fiber
drop terminal 700 that may include a fiber input channel located in
a lower portion 703 of terminal 700, consistent with the principles
of the invention. In FIG. 7A, terminal 700 may include a lower
input channel 702 for receiving an incoming fiber bundle 318.
Incoming fiber bundle 318 may be sealed to lower input channel 702
to form a weather tight interface using, for example, potting,
over-molding, sealant, and/or weather tight feed-throughs. Terminal
700 may facilitate shedding water away from lower input channel 702
by placing input channel 702 proximate to a lower portion 703 of
terminal 700 when mounted to, for example, a utility pole. If
incoming fiber bundle 318 is received from a suspended strand,
incoming fiber bundle 318 may have to be run alongside terminal 700
and looped upwards, while maintaining a determined bend radius, to
pass fiber bundle 318 into lower input channel 702.
[0097] FIG. 7B illustrates an exemplary implementation of a fiber
drop terminal 704 including a fiber input channel located in an
upper portion 705 of terminal 704, consistent with the principles
of the invention. In FIG. 7B, terminal 704 may include an upper
input channel 706 for receiving an incoming fiber bundle 318. Fiber
bundle 318 may be sealed to upper input channel 706 using, for
example, potting, over-molding, sealant, and/or weather tight
feed-throughs. An implementation, such as terminal 704, may
facilitate running an incoming fiber bundle 318 received from, for
example, a suspended strand, into upper input channel 706 without
requiring undue bending of incoming fiber bundle 318.
[0098] FIGS. 8A and 8B illustrate the exemplary implementations of
FIGS. 7A and 7B, respectively, in combination with ruggedized
multi-fiber input connectors to facilitate a removable
interconnection between an incoming fiber bundle 318 and/or an
output connector, such as output connector 312, consistent with the
principles of the invention. In FIG. 8A, terminal 800 may include a
housing 801 and an input receptacle 802 for receiving an input
connector 804. Input receptacle 802 may include any device capable
of mating with a connector. Input connector 804 may include any
device capable of making optical signals present in one or more
optical fibers available to another device. In one implementation,
input receptacle 802 may provide a weather tight seal when coupled
to input connector 804. Input receptacle 802 may be capped using a
dummy input plug when input connector 804 is not present. Terminal
800 may include input receptacle 802 located at a lower portion of
terminal 800. Input receptacle 802 may be adapted to facilitate
shedding of water from a mating area of input receptacle 802 and
input connector 804 using, for example, o-ring seals.
[0099] In FIG. 8B, terminal 806 may include an input receptacle 802
for receiving an input connector 804. Input receptacle 802 may be
located in an upper portion of terminal 806. Locating input
receptacle 802 in an upper portion of terminal 806 may facilitate
direct routing of an incoming fiber bundle to input receptacle 802
without requiring that incoming fiber bundle 318 be bent in, for
example, a loop before mating input connector 804 to input
receptacle 802. The implementations of FIGS. 8A and 8B may allow
for the installation of ruggedized input connectors on an incoming
fiber bundle 318 at the time a multi-strand fiber optic cable is
manufactured. For example, if an incoming fiber bundle 318 includes
four optical fibers, input connector 804 may be adapted to make
optical signals traversing the four fibers available to a like
number of optical fibers associated with input receptacle 802.
Input connector 804 may be capped using a dummy receptacle to
protect optical fibers within the connector when not in use. A
dummy receptacle may provide a weather tight seal and may be
removed when input connector 804 is coupled to terminal 800 and/or
806. The implementations of FIGS. 8A and 8B may facilitate economic
fabrication of fiber drops while providing a way to keep connectors
and/or input receptacles sealed until they are needed. While
implementations associated with FIGS. 8A and 8B have illustrated
input receptacle 802 as located in a lower portion or an upper
portion of terminal 800 and 806, input receptacle 802 may be
located elsewhere. For example, input receptacle 802 may be located
on a side of terminal 800 and/or 806 and/or on a front surface
and/or base of terminal 800 and/or terminal 806.
[0100] FIG. 8C illustrates an overhead view of an exemplary
implementation of the fiber drop terminals of FIG. 8A and/or 8B
showing fiber retention and/or routing techniques that may be
employed within terminal 800 and/or 806, respectively, consistent
with the principles of the invention. The implementation of FIG. 8C
may include a housing 801, an incoming fiber bundle 318, first and
second central retainer 404, 406, first and second high elevation
retainer 412 and/or 414, an input receptacle 802, an input
connector 804, a breakout device 810, optical fibers 808A-D.
Housing 306, incoming fiber bundle 318, first central retainer 404
and/or second central retainer 406, first and second high elevation
retainer 412 and 414, input receptacle 802 and input connector 804
may be substantially configured, dimensioned and/or arranged as
previously described.
[0101] Breakout device 810 may include any device capable of
receiving an optical signal and making that signal available to one
or more optical fibers. Breakout device 810 may be integral with
input receptacle 802, such as via molding input receptacle 802 to
breakout device 810 and/or breakout device 810 may be removeably
attached to input receptacle 802, such as if breakout device 810 is
coupled to input receptacle 802 using a keyed attachment mechanism.
In one implementation, input receptacle 802 may receive signals
associated with four optical fibers, breakout device 810 may convey
the respective signals to optical fibers 808A-D. Optical fibers
808A-D may have respective proximal ends and distal ends. The
proximal ends of optical fibers 808A-D may be coupled to breakout
device 810 and the distal ends may be associated with one or more
output receptacles 310. For example, housing 306 may accommodate
four output receptacles. In one implementation, optical fiber 808A
may be associated with a first output receptacle, optical fiber
808B may be associated with a second output receptacle, optical
fiber 808C may be associated with a third output receptacle, and
optical fiber 808D may be associated with a fourth output
receptacle.
[0102] Optical fibers 808A-D may be routed inside housing 306 using
first central retainer 404 and/or second central retainer 406 and
first and second high elevation retainer 412 and 414. Optical
fibers 808A-D may be cut longer than necessary to reach from
breakout device 810 to one or more output receptacles, such as
output receptacles 310A-D. Excess fiber associated with optical
fibers 808A-D may be placed in fiber coils using, for example, low
elevation retainer 408 (not shown in FIG. 8C) and/or first and
second high elevation retainer 412 and 414. The fiber coils may be
arranged in accordance with manufacturer specified minimum bend
radii associated with optical fibers 808A-D. Distal ends of optical
fibers 808A-D may have connectors attached thereto for coupling to
a like number of receptacle bodies, such as receptacle bodies
416A-D and/or the distal ends may be left bare and fused/spliced to
receptacle bodies.
[0103] Components used with fiber drop terminals may exert internal
and/or external loads on the fiber drop terminal. For example,
incoming fiber bundle 318, output connector 312, and/or output
fiber 314 may impart loads and/or stresses on terminal 300. In some
situations, these loads and/or stresses may be transferred directly
portions of terminal 300. Loads and/or stresses applied to terminal
300 may increase and/or decrease due to sagging cables, cables
subject to wind loads and/or cables subject to ice loads. Constant
and/or varying loads and/or stresses may lead to formation of
stress cracks on portions of terminal 300. For example, stress
cracks may form at stress concentration points on terminal 300,
such as proximate to first transition region 334, second transition
region 338, first inside angle 340, and/or second inside angle 342.
Implementations may employ reinforcing techniques to mitigate loads
and/or stresses associated with implementations of fiber drop
terminals, such as terminal 300.
[0104] FIGS. 9A and 9B illustrate an exemplary implementation of a
fiber drop terminal having a reinforced housing that may include
reinforcing gussets at locations that may be associated with
regions of adverse stress, consistent with the principles of the
invention. Reinforced housing 900 (FIG. 9A) may include an external
gusset 902 and/or an external housing rib 904. External gusset 902
may include any device capable of providing a retention force
between two surfaces joined at an intersection and forming an
angle. For example, external gusset 902 may span valley 906 by
contacting first stepped face 908 and/or first transition region
910 and/or second stepped face 912 and/or second transition region
914 (FIG. 9A). External gusset 902 may operate to increase the
rigidity of first stepped face 908, second stepped face 912 and/or
valley 906. External gusset 902 may be molded with reinforced
housing 900, held in place via adhesive and/or mechanical
fasteners. External gusset 902 may be implemented as a pair with
one gusset located proximate to a first outer edge 918 of
reinforced housing 900 and the other gusset located proximate to a
second outer edge 920 of reinforced housing 900. External gusset
902 may be adapted so as to not interfere with output receptacle
310 and/or output connector 312.
[0105] Implementations of reinforced housing 900 may utilize one or
more internal gussets in addition to, or in lieu of, external
gusset 902. Internal gussets may be located proximate to valley 906
within an inner cavity associated with reinforced housing 900.
Inner gussets may operate to reinforce valley 906 to reduce
detrimental effects of loads and/or stresses applied to reinforced
housing. Implementations may reinforce valley 906 and/or housing
portions proximate thereto by increasing the thickness of material
used to form valley 906 and/or housing portions proximate thereto.
The cross-section of valley 906 may be increased in conjunction
with the use of gusset 902 or the cross-section of valley 906 may
be increased in place of employing gusset 902. Implementations may
also employ standoffs spanning from an inner point of valley 906,
located within an inner cavity of terminal 900, to a base.
Standoffs may be configured and dimensioned so as to exert a force
on a portion of a base when a housing of terminal 900 is attached
to the base. Loads associated with valley 906 may be transferred
via the standoff to the base and/or to a mounting bracket
associated with a base.
[0106] Implementations of reinforced housing 900 may include an
external housing rib 904 to increase the stiffness associated with
a side of reinforced housing 900. For example, one or more external
housing ribs 904 may be arranged substantially perpendicular to a
mounting face 916. An external housing rib 904 may operate to
increase the cross section of reinforced housing 900 proximate to
an area of potentially adverse load and/or stress. Reinforced
housing 900 may include internal housing ribs in addition to, or in
lieu of, external housing ribs 904 and/or external gusset 902.
[0107] Analytical tools such as finite element modeling can be used
for analyzing an existing enclosure design and/or for designing new
enclosures so as to minimize the likelihood of load and/or stress
related failures. For example, finite element modeling may be used
to identify an implementation of a stepped-face enclosure wherein
fasteners and their corresponding attachment structures are located
so as to coincide with locations of high stress, such as for
example, at either end of a valley 906. In particular, the
fasteners can be used to attach the enclosure to a base in a manner
providing reinforcement to the valley 906.
[0108] FIG. 10A illustrates an exemplary implementation of an
enclosure mating surface utilizing a gasket device to facilitate a
weatherproof seal between a housing and a base, consistent with the
principles of the invention. The implementation illustrated in FIG.
10A may include, an enclosure base 1002, an enclosure housing 1004,
a gasket 1006, a base rib 1008, a channel 1010, a housing mating
surface 1012, a first housing rib 1014, and a second housing rib
1016.
[0109] Enclosure housing 1004 may be similar in shape, design
and/or material composition to housing 306. Enclosure housing 1004
may include an upper surface and a lower surface. The upper surface
may have an outer surface exposed to the elements and an inner
surface forming an inner cavity for housing fiber pigtails. The
upper surface of enclosure housing 1004 may include output
receptacles and/or output connectors. The lower surface of
enclosure housing 1004 may include a mating surface 1012. Mating
surface 1012 may be substantially flat so as to form a weather
tight seal with enclosure base 1002 and/or gasket 1006. Enclosure
housing 1004 may include a first housing rib 1014 and/or a second
housing rib 1016 extending from a portion of mating surface 1012.
First housing rib 1014 and/or second housing rib 1016 may operate
with mating surface 1012 to cause a deformation of gasket 1006 when
enclosure housing 1004 is mated to enclosure base 1002 using, for
example, threaded fasteners.
[0110] Enclosure base 1002 may be similar to base 302 in shape,
design and/or material composition. Enclosure base 1002 may include
a substantially continuous channel 1010 running proximate to a
perimeter of enclosure base 1002. Channel 1010 may be configured to
receive gasket 1006. Channel 1010 may be sized so that gasket 1006
extends slightly beyond the surfaces of enclosure base 1002 that
gasket 1006 may contact housing mating surface 1012 when enclosure
housing 1004 is mated to enclosure base 1002. Enclosure base 1002
may include a base rib 1008 for facilitating deformation of gasket
1006 when enclosure housing 1004 is mated to enclosure base
1002.
[0111] FIG. 10B illustrates the mating surface of the exemplary
implementation of FIG. 10A in greater detail, consistent with the
principles of the invention. In addition to the elements shown in
FIG. 10A, the implementation of FIG. 10B may include a first inner
wall 1018, a lower wall 1020, a second inner wall 1022, an inner
void 1024 and an outer void 1026. When gasket 1006 is uncompressed,
as shown in FIG. 10B, an inner void 1024 and outer void 1026 may be
present. When housing mating surface 1012, in combination with
first housing rib 1014 and second body rib 216, applies pressure to
a first side of gasket 1006 and base 1002, in combination with base
rib 1008, applies pressure to gasket 1006 from a second side,
gasket 1006 may expand laterally to fill inner void 1024 and/or
outer void 1026. When compressed, gasket 1006 may exert sufficient
pressure on mating surface 1012 and the inner walls of channel
1010, namely first inner wall 1018, second inner wall 1022 and
lower wall 1020, to prevent moisture from entering an inner cavity
1030 of housing 1004.
[0112] First housing rib 1014, second housing rib 1016 and/or base
rib 1008 may operate to facilitate a lateral expansion of gasket
1006. First housing rib 1014, second housing rib 1016 and/or base
rib 1008 may serve to form a circuitous path for moisture and/or
condensed vapor proximate to mating surface 1012, gasket 1006, and
channel 11010. Gasket 1006 may be used dry and/or with gasket
sealants and/or lubricants known in the art. In one implementation,
gasket 1006 may have a substantially rectangular cross-section when
uncompressed. Uniform expansion of gasket 1006 helps facilitate a
waterproof seal. In an alternative implementation, channel 1010 and
gasket 1006 may be disposed in enclosure housing 1004.
[0113] Implementations may facilitate correct installation on a
mounting structure, such as a utility pole, by using a mounting
bracket that is attached to the mounting structure using a tool,
such as a hammer. A fiber drop terminal, such as terminal 300, may
be attached to the mounting bracket without requiring tools. The
risk of damage to a fiber drop terminal may be reduced when
installation of the terminal to a mounting bracket and/or a
mounting structure may take place without the use tools.
Implementations may employ a relatively uncomplicated locking
and/or retaining mechanism for removeably coupling the fiber drop
terminal to the mounting bracket.
[0114] FIG. 11A illustrates an exemplary implementation of a
mounting bracket that may be used to attach an implementation of a
fiber drop terminal to a substantially vertical surface, consistent
with the principles of the invention. FIG. 11A may include a
mounting bracket 1102, a fastener 1104 and a utility pole 1106.
Mounting bracket 1102 may include any device capable of receiving a
fiber drop terminal and coupling the fiber drop terminal to a
mounting structure. Fastener 1104 may include any device capable of
securing mounting bracket 1102 to a mounting structure, such as
utility pole 1106. Utility pole 1106 may include any mounting
structure capable of supporting mounting bracket 1102 and/or a
fiber drop terminal.
[0115] Mounting bracket 1102 may be removeably coupled to utility
pole 1106 using fasteners 1104. Mounting bracket 1102 may be
fabricated from metal, plastic, composite, etc. Fastener 1104 may
include attachment devices such as screws, nails, rivets, etc.
Mounting bracket 1102 may be mounted on utility pole 1106 using
tools, such as a hammer, screw driver, rivet gun, etc.
[0116] FIG. 11B illustrates an exemplary implementation of a fiber
drop terminal mounted to a substantially vertical surface via the
mounting bracket illustrated in FIG. 11A, consistent with the
principles of the invention. Fiber drop terminal 1110 may include
any device capable of receiving an optical signal from an incoming
optical fiber and making the signal available to an outgoing
optical fiber. Fiber drop terminal 1110 may be coupled to mounting
bracket 1102 after the bracket is attached to utility pole 1106
without the use of tools. For example, fiber drop terminal 1110 may
be attached to mounting bracket 1102 using cable ties and/or other
fastening techniques known in the art.
[0117] FIG. 11C illustrates an exemplary technique for attaching
the fiber drop terminal of FIG. 11B to the bracket of FIG. 11A,
consistent with the principles of the invention. FIG. 11C may
include mounting bracket 1102, fastener 1104, utility pole 1106,
mounting post 1112A and 1112B, fiber drop terminal 1110, and keyed
receptacles 1114A and 1114B. Mounting bracket 1102 may be mounted
as described in conjunction with FIGS. 11A and 11B. Fiber drop
terminal 1110 may include one or more mounting posts 1112A and
1112B. Mounting posts 1112A and 1112B may include any device
capable of releasably coupling fiber drop terminal 1110 to a
mounting bracket 1102. For example, fiber drop terminal 1110 may
include a first mounting post located near the top of the terminal
and a second mounting post located near the bottom of the terminal.
Mounting posts 1112A and 1112B may operate as part of a keyed
coupling technique for coupling fiber drop terminal 1110 to
mounting bracket 1102. Keyed receptacle 1114A and 1114B may be
configured to receive mounting post 1112A and 1112B, respectively.
For example, mounting post 1112A and 1112B may each have a head
attached to a shaft where the head has a larger diameter than the
shaft. Keyed receptacles 1114A and 1114B may include a top portion
having a large opening capable of receiving the head and a lower
portion including smaller opening capable of receiving the shaft
but not the head. The heads on mounting post 1112A and 1112B may be
passed through the large opening and displaced so that the mounting
post shafts slide into the smaller keyed receptacle openings. Fiber
drop terminal 1110 may be releasably coupled to mounting bracket
1102 when the shaft is located in the lower portion of the keyed
receptacle opening. Fiber drop terminal 1110 may be displaced in a
direction substantially opposed to the direction used for
installation in order to disengage fiber drop terminal 1110 from
mounting bracket 1102.
[0118] FIG. 11D illustrates an exemplary implementation of a base
module 1103 having self-alignment channels to facilitate
self-alignment of a fiber drop terminal with a mounting bracket,
consistent with the principles of the invention. Implementations of
a fiber drop terminal 1110 may include a base 1103 having one or
more channels for mateably coupling fiber drop terminal 1110 to a
mounting bracket, such as mounting bracket 1102. The channels may
be arranged on a mounting bracket side 1111 of base 1103, which may
oppose a housing side 1109. Base 1103 may include an upper channel
1105 and a lower channel 1107. Upper channel 1105 and lower channel
1107 may be configured to mate with, for example, one or more
protuberances on mounting bracket 1102. The protuberances may be
configured and dimensioned to mate upper channel 1105 and lower
channel 1107 to mounting bracket 1102. When upper channel 1105
and/or lower channel 1107 are mated with mounting bracket 1102,
fiber drop terminal 1110 may be retained in a desired position.
Upper channel 1105 and/or lower channel 1107 may provide a
self-alignment feature when mating a fiber drop terminal base
and/or housing to mounting bracket 1102. Self-aligning mounting
devices may include locking devices, friction based retaining
devices, keyed retaining devices, etc. for supporting fiber drop
terminal 1110 on mounting bracket 1102.
[0119] Implementations employing mounting brackets may be
configured to receive incoming signals from one or more locations
on a fiber drop terminal. For example, an incoming fiber bundle may
enter a fiber drop terminal from the top and/or the bottom.
[0120] FIG. 11E illustrates the exemplary enclosure of FIG. 11B
along with an exemplary implementation of a top entry fiber optic
connector, consistent with the principles of the invention. FIG.
11E illustrates a fiber drop terminal 1110 including a multi-fiber
input cable 1120, an input connector 1116, and a strain relief
1118. Fiber drop terminal 1110 may include an input receptacle
mounted in a top portion of a terminal housing. Input connector
1116 may couple optical signals associated with one or more optical
fibers to one or more components associated with fiber drop
terminal 1110. Input connector 1116 may be coupled to a multi-fiber
input cable 1120. Strain relief 1118 may be molded and/or potted to
multi-fiber input cable 1120 and/or input connector 1116 to provide
strain relief to the one or more optical fibers passing through
input connector 1116. For example, multi-fiber input cable 1116 may
include an outer jacket that protects fibers within the cable
and/or operates as a structural member for reducing the risk of
damage during handling and/or installation. Strain relief 1118 may
be over-molded to the outer jacket and to an outer surface of input
connector 1116. Strain relief 1118 may operate to prevent undue
flexing of the optical fibers in the vicinity of input connector
1116. Input connector 1116, strain relief 1118 and/or an input
receptacle may operate to provide a waterproof connection to fiber
drop terminal 1110. Running incoming signals into a top portion of
fiber drop terminal 1110 may eliminate the need to bend an input
cable prior to connecting input connector 1116 to an input
receptacle or terminal 1110.
[0121] FIG. 11F illustrates the exemplary enclosure of FIG. 11B
along with an exemplary implementation of a bottom entry fiber
optic connector, consistent with the principles of the invention.
FIG. 11F illustrates fiber drop terminal 1110 in an implementation
employing an input receptacle located in a bottom portion of the
terminal. In FIG. 11F, multi-fiber input cable 1120 enters the
bottom of fiber drop terminal 1110. The implementation of FIG. 11F
may be desirable in certain situations, such as when it is
desirable to discourage water and/or ice accumulation in the
vicinity of input connector 1116 and an input receptacle interface
on terminal 1110.
[0122] Implementations may be installed in outdoor environments for
extended periods of time and may be exposed to high and low
temperature extremes. Over time, housing 1004 and/or base 1002 may
stick to gasket 1006 in such a way that it may be difficult for a
linesman to remove the housing from the base 1002 without using a
prying device, such as a coin, knife, screw driver, pliers, putty
knife, wrench, etc. Implementations may be configured to facilitate
separating the housing from a base using a prying device without
risking damage to optical fibers within a fiber drop terminal.
[0123] FIG. 12A illustrates a first exemplary implementation of a
fiber drop terminal 1200 that may include pry tabs for facilitating
removal of an enclosure housing from a base, consistent with the
principles of the invention. The implementation of FIG. 12A may
include a base 1202, a housing 1206, a first pry tab 1208, a second
pry tab 1210, a first integrated hole 1212, a second integrated
hole 1214, a first pry gap 1216 and a second pry gap 1218.
[0124] Base 1202 and housing 1206 may be configured in
substantially the same manner as base 302 and/or housing 306. First
pry tab 1208 and second pry tab 1210 may include any device
configured to provide a prying surface for facilitating removal of
housing 1206 from base 1202. For example, first pry tab 1208 and
second pry tab 1210 may be include protrusions, or tabs, molded
onto housing 1206 and having a thickness and/or rigidity sufficient
to facilitate separating housing 1206 from base 1202 when a prying
device is operated therewith. For example, the tip of a screwdriver
may be placed between an underside of first pry tab 1208 and base
1202. The screwdriver may be operated to separate housing 1206 from
base 1202 without damaging incoming optical fibers, input
connectors, and/or optical pigtails located inside housing
1206.
[0125] First pry tab 1208 and second pry tab 1210 may,
respectively, include first integrated hole 1212 and second
integrated hole 1214. First integrated hole 1212 and second
integrated hole 1214 may be configured and arranged to operate as
retaining components receiving a retaining device such as a tie
wrap, wire tie, string, chain, tape, etc., for securing housing
1206 to base 1202 when housing 1206 has been separated from base
1202 using a prying device.
[0126] FIG. 12B illustrates a second exemplary implementation of a
fiber drop terminal 1230 employing pry tabs, consistent with the
principles of the invention. The implementation of FIG. 12B may
include the features of the implementation of FIG. 12A with the
addition of a housing pry tab 1232 and a base pry tab 1234. Housing
pry tab 1232 and base pry tab 1234 may be configured similar to
first pry tab 1208 and second pry tab 1210. Housing pry tab 1232
and base pry tab 1234 may be located substantially along a
centerline of terminal 1230. Housing pry tab 1232 and base pry tab
1234 may be located along housing 1238 and/or base 1234 at other
locations. For example, housing pry tab 1232 and base pry tab 1234
may be located at a first alternative location located, for
example, along a side of terminal 1230.
[0127] FIG. 13 illustrates an exemplary implementation of a fiber
drop terminal 1300 including recessed pockets for supporting output
receptacles that may be adapted to receive output connectors,
consistent with the principles of the invention. The implementation
of FIG. 13 may consist of a fiber drop terminal 1300 that includes
a housing 1306 and a base 1302. Housing 1306 may include a front
surface 1308, an input receptacle 1310, a receptacle pocket 1312,
an output receptacle 1314, a rear base 1316, an output dummy plug
1318, a receptacle plug 1320, an o-ring 1322, a retaining lead
1324, and a stiffening rib 1326.
[0128] Housing 1306 may include any device of receiving signals
from an input cable, such as incoming bundle 318, including one or
more optical fibers and may make those signals available to one or
more output connectors via one or more output receptacles 1314.
Input receptacle 1310 may be similar to input receptacle 802. A
receptacle plug 1320 may be provided to sealably protect fibers
within input receptacle 1310 from dirt and moisture contamination.
Receptacle plug 1320 may be equipped with a sealing device such as
o-ring 1322 to facilitate a weatherproof seal. A retaining lead
1324 may be attached between housing 1306 and receptacle plug 1320
to captively retain plug 1320 when it is removed from receptacle
1310. Retaining lead 1324 can be made from wire rope, wire,
plastic, rubber, and the like using crimped connectors, adhesive,
or knots to complete attachment to housing 1306 and plug 1320.
[0129] Housing 1306 may be configured to provide structural
rigidity, water tightness, and user access via one or more
receptacle pockets 1312. Housing 1306 may be fabricated from
ultraviolet resistant (UV-resistant) plastic using injection
molding techniques known in the art. Housing 1306 may be equipped
with one or more stiffening ribs 1326 that may server to increase
the structural rigidity of housing 1306. Stiffening ribs 1326 may
be located substantially on the exterior of the housing 1306 and/or
substantially on the interior. Housing 1306 may be designed to
sealably mate with base 1302 to form a weather tight seal along the
junction of housing 1306 and base 1302.
[0130] Receptacle pocket 1312 may include a rear base 1316 for
supporting an output receptacle 1314. A front portion of rear base
1316 may have a substantially flat surface for receiving output
receptacle 1314 and a rear portion that may transition into front
surface 1308. Receptacle pocket 1312 and/or rear base 1316 may be
configured to have an angular relationship with, for example, front
surface 1308. Receptacle pocket 1312 may facilitate mounting output
receptacle 1314 at a variety of angles for facilitating ergonomic
access to output receptacle 1314 by a linesman when working with
terminal 1300, such as when coupling an output connector 1328 to an
output receptacle 1314. In addition, corresponding rows 1350 of
output receptacles 1314 may be deployed in tiers so as to
facilitate visual inspection by the linesman working from an
anticipated angle of approach. Furthermore, pockets 1312 may be
arranged so as to discourage precipitation from entering output
receptacles 1314. For example, if terminal 1300 is mounted on a
utility pole in a vertical orientation, output receptacles 1314 may
be oriented so as to generally be directed downward toward the base
of a utility pole.
[0131] Implementations of terminal 1300 may employ output
receptacle mounting angles in the range of 10.degree. to 45.degree.
as measured from front surface 1308 of housing 1306. In certain
implementations of housing 1306, receptacle mounting angles in the
range of 25.degree. to 30.degree. may be used.
[0132] Receptacle pocket 1312 may include a rear base 1316 for
providing a substantially planar surface through which output
receptacle 1314 may be mounted. Rear base 1316, or receptacle
mounting surface, may also function to provide additional stiffness
to the interface between output receptacle 1314 and housing 1306.
Employing receptacle pockets 1312 may serve to reduce and/or
eliminate areas of stress that may be encountered in
implementations employing, for example, a stepped face design.
[0133] An output connector 1328 may used in conjunction with output
receptacle 1314. Output connector 1328 may be communicatively
coupled to an output cable 1330 that includes at least one optical
fiber for conveying optical signals to a customer. Connector 1328
may employ a strain relief 1332 in the vicinity of the transition
to cable 1330 to provide strength and prevent excessive bending of
the fiber contained within cable 1330.
[0134] Base 1302 may include one or more mounting/standoff flanges
1334 to facilitate mounting of terminal 1300 at a determined
orientation with respect to a mounting structure. Base 1302 may
include one or more base stiffening ribs 1336. Housing 1306 may
also be used to facilitate mounting terminal 1300 using retaining
holes 1338. Retaining holes 1338 may receive fasteners such as
nails, screws, tie wraps, wire ties, etc., and can also be used for
moveably securing housing 1306 to base 1302 during servicing.
[0135] Retaining holes 1338 may also serve as part of pry tab such
as that shown in conjunction with FIGS. 12A and 12B to facilitate
separation of housing 1306 from base 1302 and/or a gasket running
in a channel associated with base 1302, such as the channel shown
in conjunction with FIGS. 10A and 10B.
[0136] Implementations of terminal 1300 may be further designed so
as to attach to brackets such as those shown in conjunction with
FIG. 11A. Terminal 1300 may be configured so that housing 1306 may
be removed while base 1302 remains attached to a mounting bracket
and/or mounting structure. If terminal 1300 may be mounted on
strands, weight can be added to areas of base 1302 and/or housing
1306 so as to cause terminal 1300 to remain at a desired
orientation, e.g., substantially parallel to the ground with the
terminal 1300 hanging directly below the strand to facilitate
ergonomic access by a linesman working from an expected angle of
approach.
[0137] FIGS. 14A-C illustrate various aspects of an exemplary
implementation of a fiber drop terminal 1400 having tiered
receptacles mounted on faces having an angular association with
each other, consistent with the principles of the invention.
Referring to FIG. 14A, fiber drop terminal 1400 may include a first
row of output receptacles 1402, a second row of output receptacles
1404, an input receptacle 1406, a dummy plug 1408, output
receptacles 1410A-H, a first face 1412, a second face 1414, a first
back surface 1416, a second back surface 1418, a first end surface
1420, a second end surface 1422, a common interface 1424, a
receptacle pocket 1426, and a receptacle supporting surface
1428.
[0138] Terminal 1400 may include any device capable of receiving an
incoming optical fiber and making a signal present thereon
available to an output receptacle. Terminal 1400 may be fabricated
in a manner consistent with terminals as described in conjunction
with FIGS. 3A and 13. Terminal 1400 may include one or more output
receptacles 1410A-H arranged in first row 1402 and/or second row
1404. First row 1402 may be associated with a first face 1412 and
second row 1404 may be associated with a second face 1414. First
face 1412 and second faces 1414 may meet along a common interface,
or seam, 1424 at an angle referred to as a mating angle. The mating
angle may be selected so as to present first face 1412 and/or
second face 1414 to a linesman in a manner not requiring that the
linesman maneuver in an awkward manner when accessing terminal
1400. For example, terminal 1400 may be mounted to a horizontal
strand proximate to a utility pole. First face 1412 and/or second
face 1414 may be configured so as to allow access to output
receptacles 1410A-H without requiring that the linesman crane
his/her neck and/or lean in an unsafe manner when inspecting,
accessing, or handling terminal 1400.
[0139] Output receptacles 1410A-H may respectively be associated
with a receptacle pocket 1426. Receptacle pocket 1426 may have a
receptacle supporting surface 1428 for receiving output receptacles
1410A-H. Receptacle pocket 1426 and/or receptacle supporting
surface 1428 may operate to make output receptacles 1410A-H
available to a linesman at a determined angle. The determined angle
may be a function of the location where terminal 1400 may be
mounted and/or an assumed angle of approach used by a linesman when
accessing terminal 1400. Output receptacles 1410A-H may be fitted
with dummy plug 1408 to prevent dirt and moisture from contacting
optical fibers within output receptacles 1410A-H. Dummy plug 1408
may be removed when an output connector is mated to output
receptacles 1410A-H.
[0140] First end surface 1420, second end surface 1422, first back
surface 1416, and second back surface 1418 may operate in
conjunction with first face 1412 and second face 1414 to form a
watertight enclosure. Terminal 1400 may include an input receptacle
1406 for receiving an input connector associated with an incoming
fiber bundle.
[0141] FIGS. 14B and 14C illustrate additional views of terminal
1400, consistent with implementations and principles of the
invention. Implementations of terminal 1400 may be attached to
mounting brackets adapted for, and/or attached to, utility poles,
suspended strands, walls, fiber distribution hubs, and the like.
Implementations of terminal 1400 may further employ receptacle
orientations, tier arrangements, mating angles, overall lengths,
and/or overall widths that vary according to particular
installation locations, installation orientations, and/or
anticipated angles of approach.
[0142] FIG. 15 illustrates an exemplary implementation of a fiber
drop terminal 1500 having output receptacles and contoured surfaces
associated with receptacle pocket areas, consistent with the
principles of the invention. Terminal 1500 may include a housing
1506, a contoured surface 1508, a ridge 1510, an output receptacle
opening 1512, a receptacle mounting surface 1514, an input
receptacle opening 1516, an integrated hole 1518, a housing pry tab
1520, and a fiber storage portion 1522.
[0143] Terminal 1500 may include any device capable of receiving an
incoming optical fiber and making a signal present thereon
available to an output receptacle. Terminal 1400 may be fabricated
in a manner consistent with terminals as described in conjunction
with FIGS. 3A, 13 and 14A-C. Terminal 1500 may include a housing
1506 and a base that can be manufactured using, for example,
injection molding techniques known in the art. Housing 1506 may for
an internal cavity that can include a fiber storage portion 1522.
Fiber storage portion 1522 may accommodate excess fiber in coils
retained in a substantially flat orientation and/or maintained in
an angular orientation, such as the angular orientation described
in conjunction with FIG. 5. Housing 1506 may include one or more
output receptacles that may be associated with a contoured surface
1508 and/or a receptacle mounting surface 1514.
[0144] Contoured surface 1508 may be located proximate to output
receptacle opening 1512. Contoured surface 1508 may be configured,
dimensioned and arranged to facilitate shedding of water that
contacts the outer surface of housing 1506. Contoured surface 1508
may operate to discourage ice build up around the interface of an
output receptacle in receptacle opening 1512 and/or an output
connector, such as output connector 312. Contoured surface 1508 may
be designed to shed water for a particular mounting orientation,
such as on a utility pole, or it may be designed to facilitate
shedding of water for a plurality of mounting orientations, such as
for both a horizontal mounting on a strand and a vertical mounting
on a utility pole. When output receptacle pairs are used, such as
shown in FIG. 15, a ridge 1510 may be utilized between two
contoured surfaces 1508 to facilitate removal of water from around
output receptacle opening 1512.
[0145] Implementations employing contoured surface 1508 may include
features associated with other implementations of drop terminals.
For example, terminal 1500 may include pry tab 1520, one or more
integrated holes 1518 that may be used for securing housing 1506 to
a base during servicing, an input receptacle opening 1516, a
receptacle mounting surface 1514, angled coil storage inside
housing 1506, etc. Implementations of terminal 1500 may employ
input receptacle opening 1516 proximate to a lower portion of
housing 1506 and/or proximate to an upper portion of housing 1506
for receiving an incoming fiber bundle.
[0146] FIG. 16 illustrates an exemplary implementation of a fiber
drop terminal 1600 employing a cylindrical enclosure, consistent
with the principles of the invention. Cylindrical terminal 1600 may
include, among other things, an input end cap 1602 having an input
receptacle 1604, a first output section 1606 having a first
plurality of output receptacles 1608A, 1608B, a second output
section 1610 having a second plurality of output receptacles 1608C,
1608D, 1608E and a storage end cap 1614. Cylindrical terminal 1600
may offer structural rigidity in a space efficient package due to
the cylindrical shape of the terminal. The cylindrical shape of
terminal 1600 may facilitate passage through pulleys used to deploy
strands on utility poles and/or below grade. Cylindrical terminal
1600 may include sections that can be mated as needed to produce a
terminal having a desired number of receptacles 1608.
[0147] Input end cap 1602 may be molded from plastic and may
include an input receptacle 1604 for receiving an input connector
containing multiple optical fibers. In one implementation, input
receptacle 1604 may utilize a number of fibers matching the number
of output receptacles. Input end cap 1602 may include an outer
surface and inner surface with the inner surface forming an input
cavity. Input end cap 1602 may include a input end cap mating
surface 1616 for mating input end cap 1602 to first output section
1606. Fibers may run from input receptacle 1604 through the input
cavity of input end cap 1602 en route to first output section 1606.
Fibers associated with input receptacle 1604 may be protected from
the elements when terminal 1600 is assembled. Input end cap 1602
may include an input channel in lieu of an input receptacle
1604.
[0148] First output section 1606 may be molded from plastic and may
include one or more receptacle pockets 1620 disposed around an
outer surface of output section 1606. Receptacle pockets 1620 may
include a receptacle supporting surface having an opening for
receiving output receptacle 1608A and/or 1608B. Receptacle pockets
1620 may be separated by a determined spacing that may be measured
as a distance and/or as a number of degrees. For example, if two
output receptacles are used on an output section the receptacles
may be separated by 180.degree. with respect to a centerline of
terminal 1600. If four output receptacles are used, the output
receptacles may be separated by 90.degree..
[0149] First output section 1606 may include a first mating surface
1622A and a second mating surface 1622B. First mating surface 1622A
may be configured and dimensioned to mate with input end cap mating
surface 1616. A weather tight seal may be produced when input end
cap 1602 and first output section 1606 are mated together. First
output section 1606 may be shaped so as to have an inner volume for
housing optical fibers received from input end cap 1602 and for
housing fibers passing through first output section 1606 en route
to second output section 1610. First output section 1606 may
include one or more output receptacles 1608A, 1608B arranged in
receptacle pockets 1620. First and second mating surfaces 1622A,
1622B may be substantially symmetrical and may be configured and
dimensioned to form weather tight seals with adjacent sections.
[0150] Second output section 1610 may include a third mating
surface 1624A and a fourth mating surface 1624B. Second output
section 1610 may be substantially similar to first output section
1606 in form and/or function. In one implementation, second output
section 1610 may include the same number of output receptacles that
are present in first output section 1606. When first and second
output sections 1606, 1610 are mated together, output receptacles
on one section may be offset from output receptacles on a
neighboring section by an angular offset 1626. Angular offset 1626
may be selected to facilitate access to substantially all output
receptacles associated with terminal 1600. Assume that each output
section 1606, 1610 contains four output receptacles 1608 having
relative spacings of approximately 90.degree. with respect to each
other. When terminal 1600 is assembled, first output section 1606
may be offset by approximately 45.degree. with respect to second
output section 1610 so that receptacle 1608D is aligned
substantially between output receptacles 1608A and 1608B. Terminal
1600 may include substantially any number of output receptacles and
can be realized by coupling additional output sections
together.
[0151] Storage end cap 1614 may include an outer surface and an
inner surface with the inner surface defining an inner cavity that
can be used for storing excess optical fiber. Storage end cap 1614
may utilize fiber guides, retaining hooks, adhesive, etc. for
retaining excess fiber in a desired orientation. In addition,
storage end cap 1614 may retain coils at one or more angular
orientations to facilitate achieving a determined bend radius. For
example, excess fiber associated with output receptacles 1608A-D
may be wound in coils and stored with an angular orientation to
maintain at least manufacturer recommended minimum bend radii for
the coiled fibers. Storage end cap 1614 may include a storage cap
mating surface 1628 that may be configured and dimensioned so as to
form a weather tight seal when coupled to fourth mating surface
1624B, of second output section 1610.
[0152] One or more sections of cylindrical terminal 1600 may
utilize o-rings or other compliant sealing devices to facilitate
formation of weather tight seals at the intersections of input end
cap 1602, first output section 1606, second output section 1610
and/or storage end cap 1614. In one implementation, a cylindrical
fiber drop terminal, such as terminal 1600, may have an outside
diameter on the order of 3.5'' (89 mm).
[0153] FIG. 17A illustrates an implementation of a fiber drop
terminal 1700 employing loop back-plugs, consistent with the
principles of the invention. Fiber drop terminal 1700 may be
configured in a manner similar to fiber drop terminals described in
conjunction with FIGS. 3A, 4, 5, 13, 14A, 15, and/or 16. Terminal
1700 may include output receptacles 1710A-D, a first loop-back
assembly 1701, and a second loop-back assembly 1703. Each loop-back
assembly 1701, 1703 may include a first output connector 1702 and a
second output connector 1704 communicatively coupled via an output
fiber 1706 having a loop-back portion 1708.
[0154] Output receptacles 1710A-D may be associated in pairs by way
of first loop-back assembly 1701 and second loop-back assembly 1703
for testing. For example, output receptacles 1710A and 1710D may
form a pair by way of first loop-back assembly 1701. Output
connectors 1702 and 1704 may be configured to couple output
receptacle 1710A to 1710D so that an optical signal present at
receptacle 1710A may be conveyed to output receptacle 1710D.
[0155] Implementations employing loop-back plugs may facilitate the
testing of two incoming optical fibers (e.g., 1710B and 1710C)
without requiring that a linesman be present at the fiber drop
terminal during testing. For example, a testing device and/or a
technician at a central office and/or a fiber distribution hub may
send a test signal along a first incoming optical fiber associated
with output receptacle 1710B. The test signal may pass from output
receptacle 1710B through first output connector 1702 and loop-back
fiber 1706 to second output connector 1704 and into output
receptacle 1710C. The test signal may travel through a second
incoming optical fiber to the central office and/or fiber
distribution hub where the technician is located. The technician
may detect the presence and/or absence of the test signal on the
second incoming optical fiber.
[0156] If a fiber drop terminal includes eight output receptacles,
four loop-back plug assemblies may be used to allow testing of each
output receptacle and/or fiber associated with the fiber drop
terminal. When a customer is connected to the fiber drop terminal,
the loop-back assembly may be removed from the output receptacle
that will be connected to the customer and/or removed from the
opposing output receptacle. A dummy plug may be inserted in the
opposing output receptacle to prevent dirt and moisture from
entering the opposing receptacle while not connected to a customer.
An output connector associated with an output cable running to a
customer premises may be connected to the output receptacle used to
provide service to the customer.
[0157] Prior art testing techniques may require that a linesman
inject a signal into an optical fiber at a central office and/or
fiber distribution hub and then drive to a fiber drop terminal
being tested. The linesman may leave a diesel truck idling while he
climbs a pole and determines if the test signal is present at an
output receptacle. After determining if the signal is present, the
linesman may return to the central office and/or fiber distribution
hub and connect the test signal to another fiber associated with,
for example, an adjacent output receptacle on the fiber drop
terminal. The linesman may drive back out to the fiber drop
terminal and determine if the test signal is present on the
adjacent output receptacle.
[0158] Implementations making use of loop-back plug assemblies 1701
and 1703 may produce substantial cost savings when used to test
fiber drop terminals. Cost savings may result from the time saved
by eliminating driving between a fiber drop terminal location and a
central office and/or fiber distribution hub while testing a fiber
drop terminal. Cost savings may also result from the fuel saved by
eliminating trips to and from a fiber drop terminal when performing
testing. Elimination of trips to and from a fiber drop terminal may
also conserve natural resources by reducing the consumption of
fossil fuel.
[0159] FIG. 17B illustrates an exemplary flow diagram illustrating
a method for testing a fiber drop terminal used in a communication
network consistent with the principles of the invention. A fiber
drop terminal may be installed on a multi-fiber strand along with
loop-back assemblies 1701 and/or 1703 (act 1720). For example, a
fiber drop terminal may be installed on a multi-fiber strand in an
assembly plant. For example, fiber drop terminals may be attached
to breakouts, or tethers, associated with the multi-fiber strand.
The terminated breakouts, or tethers, may be secured to the
multi-fiber strand for transport to an installation location. An
initial check of signal continuity in the optical fibers leading to
the fiber drop terminal may be performed in the assembly plant
prior to shipping the multi-fiber strand/fiber drop terminal
system. A multi-fiber strand may have numerous fiber drop terminals
attached to it.
[0160] The multi-fiber strand and fiber drop terminal are installed
at a predetermined location (act 1730). For example, the
multi-fiber strand may be suspended from two or more utility poles
and fiber drop terminals may be attached to the utility poles. A
proximate end of the multi-fiber strand may be associated with a
central office and/or an FDH serving, for example, a residential
development. A distal end of the multi-fiber strand may be located
several kilometers away from the central office and/or FDH and may
be associated with a fiber drop terminal. A deployed fiber drop
terminal may have one optical fiber associated with each output
receptacle. The fiber drop terminal may receive an incoming signal
on an optical fiber and provide the signal to a customer when
service is connected to the customer.
[0161] A signal generator may be connected to a fiber associated
with a first output receptacle (act 1740). For example, a signal
generator may be located at, for example, a central office. The
signal generator may be connected to a first fiber servicing a
first output receptacle on a fiber drop terminal. A first output
connector, associated with a loop-back assembly, may be coupled to
the first output receptacle. A corresponding output connector
associated with the loop-back assembly may be plugged into a second
output receptacle associated with a second fiber that runs back to,
for example, the central office. A signal detector may be connected
to a second fiber at the central office (act 1750).
[0162] Since first output connector 1702 is communicatively coupled
to second output connector 1704 via loop-back portion 1708, a
signal arriving at the first output receptacle may pass through
first output connector 1702, loop-back portion 1708, and second
output connector 1704 so as to be present at the second output
receptacle. An optical signal present at the second output
receptacle may traverse the second optical fiber back to the
central office and/or FDH. The optical signal traversing the second
optical fiber may be detected using the signal detector (act 1760).
The presence of an optical signal on the second fiber may indicate
that both the first fiber and second fiber are operating properly.
In contrast, if no signal and/or a degraded signal is detected on
the second fiber, the first fiber and/or the second fiber may not
be operating properly. When testing is complete, loop-back assembly
1701 may remain in place until a customer is connected to the fiber
drop terminal. At that time, loop-back assembly 1701 may be removed
and reused on another fiber drop terminal. A dummy plug may be
inserted into an unused output receptacle to prevent dirt and/or
moisture contamination.
[0163] The method of FIG. 17B may allow a single technician to test
some and/or all fiber drop terminals associated with one or more
multi-fiber strands from a single location. Testing from a single
location may provide significant time and fuel savings as compared
to testing fiber drop terminals by having a technician travel from
a central office and/or FDH to and from a fiber drop terminals
installed in the field. The method of FIG. 17B may also allow
testing during inclement weather since the technician may be
located indoors, such as when testing from a central office.
[0164] FIG. 18 illustrates a flow chart showing an exemplary method
for routing fiber strands within a fiber drop terminal employing an
angled fiber management system, consistent with the principles of
the invention. The method begins with receipt of a housing (act
1810). For example, a housing, such as an implementation
illustrated in conjunction with FIGS. 3A, 9A, 11B, 13, 14A, 15
and/or 16, may be used. An output receptacle may be installed in a
housing techniques known in the relevant arts (act 1820). An input
cable having one or more optical fibers may be passed through an
input channel, such as input channel 260, associated with a housing
of the fiber drop terminal (act 1830). Alternatively, an input
cable may be terminated with an input connector and coupled to an
input receptacle on the housing in place of the input channel.
Optical fibers associated with the input cable may be run inside
the housing and secured using, for example, central management
retainers (act 1840). In one implementation, a central management
retainer may be located between two output receptacles
substantially along the centerline of the housing. One or more
ends, such as distal ends, of the optical fibers may be connected
to one or more output receptacles (step 1850). Optical fibers may
be fused to an output receptacle and/or may be terminated with a
connector configured and arranged to mate with a
connector/receptacle associated with an output receptacle mounted
in the housing.
[0165] Excess optical fiber may be formed into one or more coils
and maintained as an angled management coil within housing 1306
using a combination of low elevation retainers and/or high
elevation retainers (step 1860). The angled management coil may be
configured so as to maintain a manufacturer recommended bend radius
of, for example, 1.2 inches and/or 1.5 inches.
[0166] FIG. 19 illustrates a flow chart showing an exemplary method
for installing a fiber drop terminal using a bracket, consistent
with the principles of the invention. A mounting location for the
fiber drop terminal is selected (act 1910). Mounting locations may
include utility poles, suspended strands, equipment racks, central
offices, and/or building structures. A mounting bracket may be
attached to the mounting surface at a desired mounting location
(act 1920). The mounting bracket may be attached using nails,
screws, rivets, adhesive, etc. A fiber drop terminal including a
housing and/or a base may be placed on or against the mounting
bracket (act 1930). The housing and/or base may be secured to the
bracket using fasteners, ties, latches, keyed interlocking devices
and/or a friction-based fit as appropriate (act 1940). For example,
the housing and/or base may be attached using screws, wire ties,
nylon ties, or using a keyed friction retaining mechanism such as a
slot and post arrangement. An output dummy plug may be removed from
an output receptacle (act 1950). An output connector having an
output fiber associated therewith may be connected to the output
receptacle to convey electromagnetic data, such as optical data, to
a customer by way of an output fiber (act 1960).
[0167] FIG. 20 illustrates a flow chart showing an exemplary method
for installing fiber drop terminals and/or output connectors onto a
multi-fiber strand prior to deployment in the field, consistent
with the principles of the invention. For example, the method of
FIG. 20 may be largely carried out in a manufacturing and/or
assembly facility. The method may begin with receipt of information
about a desired location of a fiber drop terminal (act 2010). This
location information may be used to identify, or determine, a
breakout location in the multi-fiber strand. A fiber drop terminal
may be installed at the breakout location, such as by attaching the
fiber drop terminal to a fiber bundle extracted from the
multi-fiber strand (act 2020). For example, it may be determined
that an eight-output fiber drop terminal is required on a utility
pole having a specific set of geographic coordinates associated
therewith. At the appropriate location within the multi-fiber
strand, a breakout including eight fibers may be created. This
breakout may provide eight input fibers to the fiber drop
terminal.
[0168] Returning to FIG. 20, a determination may be made as to
whether an input connector should be attached to the breakout
fibers and/or whether a fiber drop terminal should be attached (act
2030). If an input connector should be attached, the input
connector may be attached to an incoming fiber bundle (act 2040).
In contrast, if a fiber drop terminal should be attached, the fiber
drop terminal may be attached to the appropriate number of breakout
strands (act 2050).
[0169] After act 2040 and/or act 2050, the fiber drop terminal
and/or input connector may be secured to the incoming bundle in a
manner that facilitates efficient deployment in the field (act
2060). For example, an input connector and the incoming bundle
associated therewith may be attached to the multi-fiber strand
using tie wraps. The incoming bundle and input connector may be
wrapped to the multi-fiber strand in a manner facilitating passage
of the assembly through standard pulleys that may be used for
installing multi-fiber strands onto utility poles and/or below
grade. The multi-fiber strand may be deployed in the field to
provide data communication services to subscribers (act 2070).
[0170] While selected preferred implementations have been
illustrated and discussed herein, alternative configurations of
fiber drop terminals consistent with aspects of the invention are
possible. For example, an alternative implementation may include a
fiber drop terminal having threaded inserts and/or alignment
grooves for matching particular sizes and designs of suspended
strands. In particular, the inserts and grooves may be configured
to mate with selected types of mounting brackets for use with
different sizes and types of strands. In addition, the
bracket/insert/enclosure assembly may be designed so as to provide
receptacles in an orientation optimized for anticipated angles of
approach that may be used by a linesman when accessing the
installed enclosure. Furthermore, the bracket may be designed so as
to eliminate shifting, rotation about the strand, and/or sagging
while being accessed by a linesman.
[0171] Implementations may be mounted to metallic strand wires that
are suspended between utility poles. In these applications,
implementations of fiber drop terminals may be securely fastened to
the strand to avoid longitudinal shifting of the fiber drop
terminal along the strand. In addition the fiber drop terminal may
be anchored to discourage rotational shifting around the strand.
Finally the fiber drop terminal and/or mounting device may be
configured so that the fiber drop terminal is suspended a fixed
distance below the strand and/or so that the fiber drop terminal
does not sag and/or droop.
[0172] Another implementation of a fiber drop terminal may include
output connectors installed in a housing associated with a fiber
drop terminal. Output connectors may be used in place of, or in
addition to, output receptacles.
[0173] Still other implementations of a fiber drop terminal may
include provisions, such as connectors, receptacles, pigtails,
etc., for conveying communication signals over copper wires in
addition to conveying optical signals over output fibers. For
example, output receptacles may include both an optical fiber and
one or more copper conductors. Output connectors mating with the
receptacles may convey optical signals and/or electrical signals to
a destination.
[0174] Still other implementations of fiber drop terminals may
include electronic data storage and communication devices for
facilitating network deployment and configuration. For example, an
implementation of a fiber drop terminal may be equipped with a
radio-frequency identification (RFID) tag. The RFID tag can store
information related to subscribers associated with output
receptacles on the enclosure, central offices (COs) supplying data
to the enclosure, information associated with maintenance of the
enclosure, and/or the geographic location of the enclosure.
Information stored in the RFID tag can be queried by a linesman on
the ground, or in a vehicle, before climbing a utility pole using a
conventional RFID tag reader. In addition, new information can be
stored in the RFID tag to accurately reflect the status and
configuration of the enclosure. Fiber drop terminals equipped with
RFID tags or other electronic processing communication, and/or
storage devices may, for example, be referred to as intelligent
fiber drop terminals. Fiber drop terminals may also be configured
with radio-frequency and/or landline communication capabilities.
For example, a fiber drop terminal may be equipped with a cellular
transceiver that may be configured to facilitate testing of input
receptacles and/or output receptacles associated with the fiber
drop terminal and/or to facilitate error detection such as water
penetration into an enclosure.
[0175] In still other alternative implementations, fiber drop
terminals may be equipped to receive removable rain shields for
preventing precipitation from coming into contact with connectors
and receptacles when fiber drop terminals are serviced. When a
service or upgrade operation is complete, a linesman can remove the
rain shield. The rain shield may be configured to be re-useable so
that it can be used when servicing other fiber drop terminals.
[0176] In still other alternative implementations, a base may have
a receiving surface that is a channel having essentially any shape
which can be used with or without a gasket to facilitate a
watertight seal with a housing. Alternatively, the fiber drop
terminal housing may include a mating channel configured and
dimensioned to form a watertight seal with a channel in the base
and/or the housing may contain a channel with, or without, a gasket
while the base member includes a substantially flat mating surface.
In addition, the base member can be configured to have an input
connector or receptacle and/or an output connector or receptacle
for facilitating the output and/or input of electromagnetic
signals.
[0177] In yet another alternative implementation, a cylindrical
fiber drop terminal may include an input end cap molded to a first
output section and/or a storage end cap molded to a second output
section. The first output section may be configured and dimensioned
to mate with a surface of the second output section to form a
substantially watertight enclosure. Additional output sections may
be added between first output section and second output section to
achieve substantially any number and/or configuration of output
receptacles.
[0178] The foregoing description of exemplary embodiments of the
invention provides illustration and description, but is not
intended to be exhaustive or to limit the invention to the precise
form disclosed. Modifications and variations are possible in light
of the above teachings or may be acquired from practice of the
invention. For example, while series of acts have been described
with respect to FIGS. 17B, 18, 19 and 20, the order of the acts may
be varied in other implementations consistent with the invention.
Moreover, non-dependent acts may be implemented in parallel.
[0179] No element, act and/or instruction used in the description
of the application should be construed as critical or essential to
the invention unless explicitly described as such. Also, as used
herein, the article "a" is intended to include one or more items.
Where only one item is intended, the term "one" or similar language
is used. Further, the phrase "based on" is intended to mean "based,
at least in part, on" unless explicitly stated otherwise.
[0180] The scope of the invention is defined by the claims and
their equivalents.
* * * * *