U.S. patent application number 13/205070 was filed with the patent office on 2011-12-01 for network interface device.
This patent application is currently assigned to Samsung Electronics Co., Ltd. Invention is credited to Seung-soo OAK.
Application Number | 20110292447 13/205070 |
Document ID | / |
Family ID | 33536225 |
Filed Date | 2011-12-01 |
United States Patent
Application |
20110292447 |
Kind Code |
A1 |
OAK; Seung-soo |
December 1, 2011 |
NETWORK INTERFACE DEVICE
Abstract
A network interface device having a first board to connect with
a wired network to provide signal exchange, which is mounted in a
network electronic device, a second board to connect with a
wireless network to provide signal exchange, and a first and a
second link portion provided at the first and the second boards to
removably connect the first and the second boards,
respectively.
Inventors: |
OAK; Seung-soo;
(Seongnam-si, KR) |
Assignee: |
Samsung Electronics Co.,
Ltd
Suwon-si
KR
|
Family ID: |
33536225 |
Appl. No.: |
13/205070 |
Filed: |
August 8, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10833113 |
Apr 28, 2004 |
8018922 |
|
|
13205070 |
|
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Current U.S.
Class: |
358/1.15 |
Current CPC
Class: |
H04L 12/5692 20130101;
H04W 92/02 20130101 |
Class at
Publication: |
358/1.15 |
International
Class: |
G06F 3/12 20060101
G06F003/12 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 24, 2003 |
KR |
2003-41253 |
Claims
1. A network printer comprising: a printing unit to print an image
on a paper medium; and a network/processor unit including a wired
portion to facilitate communication with a wired network, a
wireless portion to facilitate communication with a wireless
network, and a processing portion to process signals received from
the wired network and the wireless network, wherein a same physical
address and a same IP address are allocated to the wired portion
and the wireless portion of the network/processor unit such that
the network printer uses only one physical address and only one IP
address for wired communication and for wireless communication.
2. The network printer of claim 1, wherein when the wired portion
and the wireless portion are coupled to provide a signal exchange
therebetween, the processing portion allocates the physical address
of one of the wired and wireless portions to another one of the
portions.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application a continuation of prior application Ser.
No. 10/833,113, filed on Apr. 28, 2004, which claims the benefit of
Korean Patent Application No. 10-2003-0041253 filed Jun. 24, 2003,
in the Korean Intellectual Property Office, the disclosure of which
is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a network interface device,
and more particularly, to a network interface device which is
adapted to electronic devices, such as computers and printers, to
connect them to wired or wireless networks.
[0004] 2. Description of the Related Art
[0005] Generally, a network interface device is installed in a
network electronic device, such as a computer and a printer, to
connect the electronic device to wired, or wireless networks.
[0006] FIGS. 1 and 2 show one example of the network electronic
device, i.e., a printer. It is common that a printer 100, as shown
in FIGS. 1 and 2, is connected to a network through the employment
of network interface devices 150, 150' which are separately
purchased. In this case, the network interface devices 150 and 150'
are removably mounted on a mounting portion 115 of the printer 100,
while being selectively blocked from the outside by a side cover
110, and the network interface devices 150 and 150' usually include
a board 151, a bracket 153 and a connecting terminal 155.
[0007] The board 151 is usually a printed circuit board (PCB)
having predetermined circuits printed thereon, and for the signal
exchange with wired or wireless networks, there are a plurality of
electronic elements P (see FIG. 3) equipped with a data processing
unit (not shown) and a memory (not shown) connected with the
predetermined circuits on the board 151. On one side of the board
151, there is the connecting terminal 155 removably mounted on a
connecting slot 118 of the printer 100. With the connection between
the connecting terminal 155 and the connecting slot 118, the data
processing unit (not shown) is connected with a printer control
unit 120 (FIG. 4) of the printer 100 so as to mutually exchange
signals.
[0008] Meanwhile, the bracket 153 is to fix the network interface
devices 150 and 150' to the printer 100, and with the connection
between the connecting slot 118 and the connecting terminal 155,
the bracket 153 is fixed to the printer 100 by fasteners S. The
bracket 153 also has connecting ports 157 and 158, which connect
the data processing unit (not shown) to the wired or wireless
networks. The connecting port 157 for the wired network is
connected with a connecting means such as a LAN cable for a wired
network, while the connecting port 158 for a wireless network is
connected with separate components such as an antenna A or a light
receiving device (not shown) corresponding to the wireless signal
transmission/reception mode. If a wireless network interface device
having a built-in antenna such as PCMCIA therein is used, the
connecting port 158 for a wireless network may be omitted.
[0009] The network interface devices 150 and 150' constructed as
described above are mainly characterized into two uses: 1) for use
in a wireless network such as a wireless LAN and an IRDA; and 2)
for use in a wired network such as Ethernet, which are respectively
available on the market.
[0010] Accordingly, a plurality of connecting slots 118 also need
to be prepared in the printer 100 for the mounting of the plurality
of network interface devices 150 and 150'. As a result, the printer
100 usually becomes large-sized, and manufacturing costs also
increase.
[0011] Additionally, in order for the electronic devices having the
two types of network interface devices 150 and 150' to be connected
to the Internet, different Internet protocol (IP) addresses have to
be allocated to the network interface devices 150 and 150' and
managed, respectively. As a plurality of IP addresses are allocated
and managed for one electronic device, constructing a network costs
considerably.
[0012] Still further, because the plurality of network interface
devices 150 and 150' each keep physical addresses, i.e., Media
Access Control (MAC) addresses, it is difficult to manage the a
plurality of IP addresses or the physical addresses when a
plurality of network interface devices 150 and 150' are installed
together in a single electronic device.
SUMMARY OF THE INVENTION
[0013] In an effort to resolve the problems as mentioned above, an
aspect of the present invention is to provide a network interface
device which enables connecting of network electronic devices both
to wired and wireless networks.
[0014] Additional aspects and advantages of the invention will be
set forth in part in the description which follows and, in part,
will be obvious from the description, or may be learned by practice
of the invention.
[0015] The foregoing and/or other aspects of the present invention
are achieved by providing a network interface device including a
first board and a second board. The first board comprises a first
data processing unit which is connected with one among a wireless
network and a wired network to provide signal exchange, a first
connecting terminal which is removably connected with a network
electronic device to connect the network electronic device with the
first data processing unit to provide signal exchange, and a first
link portion connected with the first connecting terminal to
provide signal exchange. The second board includes a second data
processing unit which is connected with one among the networks to
provide signal exchange, and a second link portion which is
connected with the second data processing unit to provide signal
exchange, and also connected with the first link portion to provide
signal exchange.
[0016] As one or both of the wired and wireless networks can be
connected to the network electronic device through a shared network
interface apparatus which is provided in a single connecting slot,
the network electronic device can be compact-sized, and can be
provided for the respective uses at a reduced cost.
[0017] In an aspect of the present invention, the first data
processing unit is connected with the wired network and the second
data processing unit is connected with the wireless network.
[0018] In another aspect of the present invention, the first link
portion comprises a connecting hole formed in the first board, and
the second link portion comprises a connecting protrusion formed on
the second board to provide a connection with the connecting hole,
such that the first and the second boards are connected with each
other with the connection of the connecting hole and the connecting
protrusion to provide mutual signal exchange.
[0019] Further provided is a fixing unit to prevent movement of the
second board with respect to the first board during the connecting
of the first and the second boards. The fixing unit comprises a
fixing bracket which is removably connected to the first board, and
the second board is pressed toward the first board by the fixing
bracket.
[0020] Meanwhile, electronic elements are mounted on a side of the
first board to provide signal exchange with a network, which is
connected with the first data processing unit, and the first link
portion is installed on the other side of the first board.
[0021] The first board comprises a first port connected with the
first data processing unit to connect the first data processing
unit to one of the networks, and at least one of the first and the
second boards has a connecting port to connect with the other
network, which is connected with the second data processing
unit.
[0022] The connecting port comprises a second port which is
installed in the first board to selectively connect with a network
which is connected with the second data processing unit, and the
second data processing unit is connected to the second port through
the first and the second link portions.
[0023] The second port and the first link portion can be connected
via the first data processing unit, and the second port and the
second data processing unit can be directly connected through a
signal transmission/reception cable to provide signal exchange.
[0024] The network electronic device refers to a printer, and the
first data processing unit preferably includes an auxiliary control
unit to convert signals from the networks into print control
signals and output to the first connecting terminal.
[0025] Additionally, it is preferable that the auxiliary control
unit converts the signals from the second data processing unit into
print control signals and output to the first connecting
terminal.
[0026] Meanwhile, the first data processing unit comprises a memory
to store a physical address of the first board, and controls the
second data processing unit such that the physical address stored
in the memory can be allocated as the physical address of the
second board during the connection of the first and the second link
portions.
[0027] The first data processing unit further comprises an address
management unit to manage an IP address allocated to the first
board, and the address management unit manages the second data
processing unit such that the IP address which is the same as that
of the first board can be allocated to the second board when the
first and the second link portions are connected with each
other.
[0028] The second board further comprises a second connecting
terminal which is removably connected to a second network
electronic device which is different from the network electronic
device in which the first board is mounted, the second connecting
terminal being connected with the second data processing unit, and
a third port to connect with a network which is connected with the
second data processing unit.
[0029] Accordingly, not only the first board, but also the second
board is capable of being provided in the network electronic device
and performing network interface functions independently.
[0030] The first and the second data processing units each comprise
a memory to store a physical address corresponding to the first and
the second boards, and the first data processing unit controls the
second data processing unit such that when the first board is
mounted in the network electronic device in connection with the
second board, the physical address of the second board is identical
with the physical address of the first board.
[0031] The first and the second data processing units each comprise
an address management unit to manage such that the first and the
second boards are allocated with different IP addresses,
respectively, and the first data processing unit controls the
second data processing unit such that when the first board is
mounted in the network electronic device in connection with the
second board, the IP address allocated to the second board is
identical with the IP address allocated to the first board.
[0032] The connecting port comprises a second port which is
installed in the first board to removably connect with one of the
networks which is connected with the second data processing unit,
and the second data processing unit is connected with the other
network through the second port when the first board is mounted in
the network electronic device in connection with the second
board.
[0033] The network electronic device connected with the first
board, and the network electronic device connected with the second
board, preferably exchange signals with corresponding boards
according to different protocols.
[0034] The foregoing and/or other aspects of the present invention
are also achieved by providing a network interface device to
facilitate transfer of data between plural communication networks
and a terminal device, comprising: a first circuit board including
a first data processing unit to receive wired data from at least
one external wired communication network and to process the wired
data to produce processed wired data, and a first link portion; a
second circuit board including: a second data processing unit to
receive wireless data from at least one external wireless
communication network and to process the wireless data to produce
processed wireless data, and a second link portion; and a
connecting terminal to receive at least one of the processed wired
data and at least one of the wireless processed data and to
transmit the at least one of the processed wired data and/or the at
least one of the wireless processed data to the terminal device,
wherein the first link portion and the second link portion are
capable of connecting to each other to establish a communication
link between the first circuit board and the second circuit board,
and the connecting terminal receives both the at least one of the
processed wired data and the at least one of the wireless processed
data when the communication link is established.
[0035] The foregoing and/or other aspects of the present invention
are also achieved by providing a network interface device to
facilitate an exchange of signals between one or more communication
networks and a network electronic device having a slot, comprising:
a first board having a bracket removably attachable to the slot of
the network electronic device, the first board comprising a first
data processing unit to provide signal exchange between the network
electronic device and one of the communication networks, a first
connecting terminal connected to the first data processing unit and
connectable to the network electronic device, a first connecting
port connected to the first data processing unit and connectable to
one of the communication networks, and a first link portion
connected to the first data processing unit and connectable to the
other one of the communication networks.
[0036] In an aspect of the above network interface device, there is
further provided: a second board removably attached to the first
board, the second board comprising a second data processing unit to
provide signal exchange between the network electronic device and
the other one of the communication networks through the first data
processing unit, a second link portion connected to the second data
processing unit and connectable to the first link portion of the
first board, and a second connecting port connected to the second
data processing unit and connectable to the other one of the
communication networks.
[0037] The foregoing and/or other aspects of the present invention
are also achieved by providing a network interface device to
facilitate an exchange of signals between one or more communication
networks and a network electronic device having a slot connected to
a bracket of a first board of the network interface device,
comprising: a second board detachably attached to the first board,
comprising a data processing unit to provide signal exchange, a
link portion connected to the data processing unit and connectable
to the first board, and a connecting port connected to the data
processing unit and connectable to the one of the communication
networks, wherein the second board does not have a bracket to be
connected the slot.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] These and other aspects and advantages of the present
invention will become apparent and more readily appreciated from
the following description of the embodiments, taken in conjunction
with the accompanying drawings of which:
[0039] FIG. 1 is a perspective view of a printer as one example of
conventional network electronic device;
[0040] FIG. 2 is a view illustrating a method of mounting a
conventional network interface device onto a network electronic
device;
[0041] FIG. 3 is an exploded perspective view of a network
interface device according to an embodiment of the present
invention;
[0042] FIG. 4 is a block diagram illustrating the network interface
device of FIG. 3;
[0043] FIG. 5 is an exploded perspective view of a network
interface device according to another embodiment of the present
invention; and
[0044] FIG. 6 is a block diagram illustrating the network interface
device of FIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0045] Reference will now be made in detail to the embodiments of
the present invention, examples of which are illustrated in the
accompanying drawings, wherein like reference numerals refer to the
like elements throughout. The embodiments are described below in
order to explain the present invention by referring to the
figures.
[0046] FIG. 3 shows an appearance of a network interface device 200
according to an embodiment of the present invention, and FIG. 4
shows the structure of the network interface device 200 according
to the embodiment of FIG. 3.
[0047] Referring to FIGS. 3 and 4, the network interface device 200
according to this embodiment of the present invention comprises a
first board 210 and a second board 250. The first and the second
boards 210 and 250, respectively, are removably connected with each
other, and being connected, a mutual signal exchange is
enabled.
[0048] The first board 210 comprises a first data processing unit
220, a first connecting terminal 215, a first link portion 240 and
a first connecting port 217. The first data processing unit 220 is
generally formed by a plurality of electrical components which are
mounted on a circuit board 211 of the first board 210, i.e.,
mounted on a side (not-shown) of the circuit board 211 of FIG. 3,
and is constructed to be able to transmit and receive signals with
a wireless network W and a wired network E. According to the
present embodiment, the first data processing unit 220 is
constructed to transmit and receive signals with the wired network
E.
[0049] The first connecting terminal 215 and the first connecting
port 217 are to connect the first data processing unit 220 to the
printer 100 (FIG. 1) and to the wired network E. According to this
embodiment, the first connecting terminal 215 is removably
installed in a connecting slot 118 similar to the connecting slot
illustrated in FIG. 2, which is provided inside the printer 100.
The first connecting port 217 is also removably connected to
another physical connecting unit, such as a LAN cable, which is
connected with other network electronic devices. It is an aspect of
this embodiment that the first connecting port 217 is prepared on a
bracket 212 and exposed to an outside portion of the printer 100
with the mounting of the first board 210. The bracket 212 is
constructed in the same manner as the conventional bracket 153
(FIG. 2), and therefore, a detailed description thereof will be
omitted. Meanwhile, the first link portion 240 is to connect the
first board 210 with the second board 250. Additionally, an
auxiliary control unit 230 is provided to the network interface
device to use with the printer 100 according to the present
embodiment. The first link portion 240 and the auxiliary control
unit 230 will be described in detail later.
[0050] The second board 250 comprises a second data processing unit
260 and a second link portion 270. The second data processing unit
260 is connected to the wireless network W and the wired network E
through the plurality of electronic components P mounted on a
circuit board 251 of the second board 250. It is an aspect of this
embodiment that the second board 250 is connected to a certain type
of network, i.e., connected to a network that is not connected to
the first data processing unit 220. According to the present
embodiment, the second data processing unit 260 is connected to the
wireless network W. If the second data processing unit 260 is
connected to the wireless network W, the second board 250 may be
connected to the wireless network W through a separate wireless
transmitting and/or receiving device, such as an antenna A
connected to a connecting port 219, which is separately provided on
the first board 210, or through an embedded antenna (not shown) in
the substrate 251, which is not exposed external to the printer
100. However, the above described connections are not limited to
the above configurations only, but may be connected in any manner
which serves the intended purpose of the present invention. In this
embodiment, the second board 250 comprises a tuner-type second
connecting port 280, and the second connecting port 280 is to
connect the second board 250 to a wireless network W by being
connected through the third connecting port 219 (FIG. 3) of the
first board 210 and through the signal exchange cable C (FIG. 3).
An antenna A connected to the third connecting port 219 may
preferably be a radio frequency (RF) antenna.
[0051] Meanwhile, the second link portion 270 is to connect the
first and the second boards 210 and 250, respectively, to provide
signal exchange, by being selectively connected to the first link
portion 240. To this end, the first and the second link portions
240 and 270, respectively, can be constructed in various ways. For
example, in this embodiment, the first and the second link portions
240 and 270 each comprise a connecting hole 245 formed in the first
link portion 240, and a connecting protrusion 275 which protrudes
from the second link portion 270. Alternatively, a remote distance
connecting method using a separate generally-used signal exchange
cable (not shown) can also be used. Meanwhile, with the connection
of the first and the second link portions 240 and 270,
respectively, having the connecting hole 245 and the connecting
protrusion 275, the first and the second boards 210 and 250,
respectively, are combined with each other tightly. When connecting
the first and the second boards 210 and 250 in tight contact to
provide signal-exchange, most of the electronic elements on the
first board 210 are arranged on a side of the first board 210,
while there is only the first link portion 240 that is arranged on
the other side (i.e., the side shown in FIG. 3) to make connecting
the first and the second boards 210 and 250, respectively,
easier.
[0052] With the network interface device 200 in which the first and
the second boards 210 and 250, respectively, are connected by the
connecting protrusion 275 and the connecting hole 245, as shown in
FIG. 3, a fixing unit is additionally provided to ensure stable
connection of the first and the second boards 210 and 250,
respectively. According to the present embodiment, the network
interface device 200 has a fixing bracket 290 as the fixing unit,
which is removably connected to the first board 210. The fixing
bracket 290 is fixed to the first board 210 by the connection of a
plurality of elastic protrusions 293 and 295, respectively, and
connecting holes 213, and with the connection of the elastic
protrusions 293 and 295, respectively, and the connecting holes
213, the second board 250 is pushed into tight contact with the
first board 210.
[0053] The operation of the network interface device 200
constructed as described above and according to the embodiment of
FIGS. 3 and 4 will be described below.
[0054] First, in a case that there is only the first board 210
mounted in the printer 100, the first data processing unit 220 is
connected to the wired network E through the first port 217, and
becomes capable of signal exchange with the printer control unit
120 through the first connecting terminal 215. More specifically,
in the case of the present embodiment in which the first board 210
is mounted in the printer 100, which transmits and receives signals
in accordance with protocol different from a general computer (not
shown), the auxiliary control unit 230 is additionally provided to
the first data processing unit 220 to provide signal exchange
between the printer control unit 120 and the data processing unit
220. In this case, the auxiliary control unit 230 transforms the
input signals from the wired network E into print control signals,
and outputs the transformed signals to the printer control unit
120. Accordingly, there is no need to install a control unit (not
shown) in the printer 100, which is usually complex, to transform
the signals, and therefore the printer 100 can be provided at an
economic cost for the places that do not require connection to
networks.
[0055] Meanwhile, when the first and the second boards 210 and 250,
respectively, are mounted in the printer 100 in connection with
each other, the wired network E and the printer 100 are connected
in the same way as connecting the first board 210 to the printer
100 while the wireless network W and the printer 100 are connected
through a second port 280. In other words, as the second data
processing unit 260 is connected with the wireless network W
through the second port 280, the wireless network W is connected
with the printer 100 to provide mutual signal exchange. Meanwhile,
the second board 250 can receive power supplied from the printer
100 via the first and the second link portions 240 and 270,
respectively. In this case, the second data processing unit 260 is
connected to the printer control unit 120 sequentially through the
second link portion 270, the first link portion 240 and the first
connecting terminal 215. If the first and the second boards 210 and
250, respectively, are mounted in the printer 100 in connection
with each other as in the present embodiment, it is an aspect of
this embodiment that the first data processing unit 220 is arranged
on a signal transmission path that connects the first link portion
240 with the first connecting terminal 215 so that the second data
processing unit 260 and the first connecting terminal 215 are
controlled by the first data processing unit 220.
[0056] As described above, when the printer 100 is connected to the
wired and wireless networks E and W, respectively, it is an aspect
of the invention that the same network address, i.e., the same IP
address, is allocated to the printer 100 with respect to the
respective networks E and W. By doing so, maintenance requirements
for the networks with a plurality of IP addresses of the printer
100 can be reduced. According to the present embodiment, the first
data processing unit 220 further comprises an address manage unit
227, and the address manage unit 227 causes the same IP address to
be given to the second data processing unit 260 and to the first
data processing unit 220.
[0057] When the same IP address is allocated to the first and the
second boards 210 and 250, respectively, the first data processing
unit 220 temporarily stores the signals received through the
respective ports 217 and 280, respectively, in a sequential order.
The first data processing unit 220 keeps the signal from the other
network waiting until the signal exchange between one network with
the printer control unit 120 is completed. Then with the completion
of the signal exchange, the first data processing unit 220 controls
signal exchange between the printer control unit 120 with a
corresponding network so as to attend to the signals being inputted
through the other port. Since the same network address is given
both for the wired and wireless networks, malfunction of the
printer 100 due to redundant reception of signals through the first
and the second data processing units 220 and 260, respectively, can
be prevented.
[0058] Meanwhile, with respect to the network interface device 200
according to the embodiment of FIGS. 3 and 4, it is an aspect of
the invention that the first and the second boards 210 and 250,
respectively, are provided with a single physical address, i.e., a
single Media Access Control (MAC) address. To this end, the first
data processing unit 220 controls the second data processing unit
260 so that the MAC address, which is stored in the memory 225, is
provided to the first and the second boards 210 and 250,
respectively. As a result, even in the complex function in which
the first and the second boards 210 and 250, respectively, connect
the printer 100 to the plurality of networks E and W, respectively,
the first and second boards 210 and 250, respectively, can be
controlled as one body, and therefore, maintenance becomes
easier.
[0059] FIG. 5 shows the appearance of a network interface device
according to another embodiment of the present invention, and FIG.
6 shows the structure of the network interface device according to
the embodiment of FIG. 5.
[0060] Referring to FIGS. 5 and 6, the network interface device 300
according to this embodiment is distinguished from the previous
embodiment mainly in the facts that the second board 350 can be
independently connected to the connecting slot 118 (FIG. 2) of the
printer 100, or can be installed in other electronic devices such
as a computer (not shown) which is capable of signal exchange
according to a protocol different from the printer 100.
[0061] In order to accomplish the above aspects, the second board
350 of the network interface device 300 according to this
embodiment further comprises a second connecting terminal 390. The
second connecting terminal 390 may be constructed in the same way
as the first connecting terminal 315, or can be constructed for the
signal exchange in accordance with a protocol which is different
from the first connecting terminal 315.
[0062] According to this embodiment, the first board 310 further
comprises a third port 319. The third port 319 is connected to the
second board 350 via a separate cable C to be able to transmit and
receive signals with the second data processing unit 360. Albeit
not shown, the third port 319 can be connected with the second data
processing unit 360 sequentially through the first data processing
unit 320 and the first and the second link portions 340 and 370,
respectively.
[0063] Accordingly, if it is impossible to install the second
connecting port 380 on the second board 350 due to a limited
installation environment of the network interface device 300, or if
it is impossible to use the second port 380 installed on the second
board 350, the second data processing unit 360 can be connected
with the other external networks by an indirect route, i.e.,
through the third port 319. To this end, when the second data
processing unit 360 is connected with the wireless network W, the
third port 319 is constructed to be connected with a separate
transceiver, such as an antenna A, which corresponds to the signal
transmission and/or reception mode of the wireless network, and
when the second data processing unit 360 is connected with the
wired network E, the third connecting port 319 is constructed to be
a connecting port for a wired network, such as an RJ-45 JACK.
[0064] Meanwhile, according to this embodiment, considering the
fact that the second board 350 is independently mounted on the
electronic device of another network to be used, the second data
processing unit 360 may further include a memory 365 and an address
manage unit 367. Accordingly, when the second board 350 is
independently used for the network electronic device, the second
board 350 can have a MAC address and an IP address which are
different from the first board 310. In other words, the second
board 350 can perform independent network interfacing. In the case
that the first and the second boards 310 and 350, respectively, are
used in connection with each other, the first data processing unit
320 controls the second data processing unit 360 so that the second
board 350 is allocated with the same MAC address and the IP address
as those of the first board 310. In either case, the same effect as
obtained in the previous embodiment is guaranteed.
[0065] So far, the case is provided in which the first board is
connected to the wired network while the second board is connected
to the wireless network, as a network interface device for use in
the network printer. However, this is just by way of an example,
and one will appreciate that the present invention will not be
limited to the described example only. Accordingly, the network
interface device according to the present invention can be adapted
to various network electronic devices, and also, the first board
can be connected to the wireless network while the second board is
connected to the wired network. Further, the first and the second
link portions are not limited to the above-described forms of
protrusions and holes, but can be modified in various ways such as
cable connection.
[0066] According to the embodiments of the present invention, a
predetermined number of network interface devices 200 and 300 are
provided and are capable of connecting to at least one of wired and
wireless networks E and W, respectively, through a single
connecting terminal 118 (FIG. 2) provided at the network electronic
device 100. As a result, compactness of the network electronic
device 100 can be obtained, manufacturing costs are reduced, and
the unit price of the electronic device 100 is reduced because
there is no need to separately purchase a network interface device
150 and 150' (FIG. 2) anymore.
[0067] Although a few preferred embodiments of the present
invention have been described, it will be understood by those
skilled in the art that the present invention should not be limited
to the described preferred embodiments, but instead, various
changes and modifications can be made within the spirit and scope
of the present invention as defined by the appended claims.
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