KR20070120742A - Subscriber processing apparatus and method for setting receiving port thereof - Google Patents

Abstract

A subscriber processing apparatus and a method for setting a receiving port thereof are provided to sense isolation in real time if the isolation of subscriber data is generated between the subscriber processing apparatus and a switching device due to port faults or cable faults, thereby maintaining a continuous service. A transceiver transmits and receives data to and from a switching device by interfacing with the switching device. The transceivers(318,328) include first and second ports(311,312,321,322). During a transmission operation, the transceiver forwards data to the first and second ports. During a receiving operation, the transceiver receives data from one port selected from the first and second ports. The transceivers further include diagnosis message generators(3181,3281) for generating a diagnosis message including information about the selected port, and include diagnosis message transceivers(3182,3282) for periodically transmitting the diagnosis message through the first and second ports.

Description

SUBSCRIBER PROCESSING APPARATUS AND METHOD FOR SETTING RECEIVING PORT THEREOF}

1 is a schematic diagram showing a part of communication equipment used in a mobile communication switching center.

2 is a schematic structural diagram of a duplicated subscriber processing apparatus.

3 is a diagram for explaining data transmission in a duplicated subscriber processing apparatus.

4 is a view for explaining data reception in a duplicated subscriber processing apparatus.

FIG. 5 is a connection configuration diagram of a subscriber processing device and a switching device of FIG. 2. FIG.

6 is a block diagram showing the configuration of a reference subscriber processing apparatus according to the present invention;

Figure 7 is a block diagram showing the configuration of a general subscriber processing apparatus according to the present invention.

8 is a connection configuration diagram illustrating a manner of connecting the subscriber processing apparatus and the switching apparatus of FIGS. 6 and 7 according to the present invention.

9 is a logical flow diagram of a method of setting up a receiver processing device receiving port according to the present invention;

The present invention relates to a subscriber processing apparatus in a mobile communication system, and more particularly, to a method of setting a receiving port of a subscriber processing apparatus for preventing the isolation of the subscriber processing apparatus.

Mobile communication systems such as CDMA or WCDMA have provided various services, such as text messaging, financial settlement, home automation, and wireless Internet, away from conventional voice call-oriented services. Accordingly, subscriber terminals are also diversified, and the types of data transmitted / received at one terminal are also broadened. In order to smoothly transmit and receive various types of data from various subscriber terminals, a device for matching the types of user data, that is, subscribers Processing device is required. In order to explain the function of the conventional subscriber processing apparatus, reference is made to FIG. 1, which schematically shows a part of the communication equipment used in the mobile telecommunication switching center.

In FIG. 1, communication device 100 includes a plurality of subscriber devices 111, 113, and 115, a subscriber processing device 130 connected to a plurality of subscriber devices, and a switching device 150 connected to a subscriber processing device. . Subscriber devices 111, 113, and 115 are devices that process data for each subscriber. The subscriber device cannot be directly connected to the switching device 150 because its data format is different for each device (subscriber terminal and transmission / reception data type). For this reason, the subscriber processing apparatus 130 is connected to the plurality of subscriber apparatuses 111, 113, and 115 and the switching apparatus 150. As shown in FIG.

The subscriber processing apparatus 130 converts the output data of the plurality of subscriber apparatuses 111, 113, and 115 into a suitable data format that the switching apparatus 150 can recognize, and then multiplexes the output data. In addition, the subscriber processing apparatus 130 demultiplexes the data received through the switching device 150, and converts the data into a data format that can be recognized by the connected subscriber apparatuses 111, 113, and 115 and outputs the data. Perform. Through such a subscriber processing device 130, each subscriber device (terminal) enables smooth data transmission and reception regardless of the data format used. The subscriber processing unit 130 may perform functions such as mapping to the switching device 150, alarm / reset / control of the subscriber devices 111, 113, and 115 in addition to the data matching function described above.

The switching device 150 transmits the data received from the subscriber processing device 130 to another subscriber processing device or another switching device. In addition, it performs a function for transmitting data received from another subscriber processing device or another switching device to the subscriber processing device (130).

Meanwhile, the subscriber processor 130 or the switching device 150 may be dually operated to increase the reliability. Redundancy means that two devices (boards) of the same function are mounted in a device, one of which is active and the other of which is operated in a standby state. The transmission and reception of data is carried out only on the active board, and if the active board is bad and there is a problem in using the service, the standby board is switched to the active state to provide continuous service.

2 is a schematic configuration diagram of a dual subscriber processing apparatus. The subscriber processing apparatus 200 is redundant, and includes two boards having the same function and configuration including transmission and reception, that is, the A board 210 and the B board 220. Each of the A board 210 and the B board 220 may include two ports 211 and 212 and 221 and 222 connected to a port and a link of a switching device, as described below. The reason each board has two ports is to enable cross linking with the switching devices. This will be described in more detail with reference to FIG. 5. The A board 210 and the B board 220 each include a general data processing unit of the subscriber processing apparatus as well as a data matching unit for switching the data format as described above (not shown).

3-4 is a diagram for explaining the transmission and reception of data when one board, for example, the A board 210 is active. As shown, the A board 210 includes a transceiver 218 that is directly related to transmission and reception, and a data processor 219 that performs the general functions of the subscriber processor. The transceiver 218 includes two input / output ports 211 and 212, a distributor 215, and a selector 217.

First, the transmission of data will be described with reference to FIG. The distributor 215 copies the data input from the data processor 219 to generate two identical data and transfers the same data to two ports, that is, the AA port 211 and the AB port 212. Therefore, at the time of data transmission, two identical data are transmitted.

Next, the reception of data will be described with reference to FIG. 4. The selector 217 selects one of the data input from the AA port 211 and the AB port 212 and transfers it to the data processor 219. Accordingly, when receiving data, one of two data received through the two ports 211 and 212 is selected and processed. In this case, since a method of selecting a receiving port of selecting which port's data is known in the art, a detailed description thereof will be omitted.

5 is a diagram illustrating a connection between a subscriber processing device having the configuration of FIGS. 3-4 and a redundant switching device.

First, when the configuration of the switching device 150 is described, the switching device 150 includes two boards that are duplicated and have the same function and configuration including transmission and reception, that is, the A board s10 and the B board s20. Each of the A board s10 and the B board s20 includes two ports s11 and s12 and s21 and s22 connected by a link with a port of a subscriber processing apparatus.

Redundant and the redundant subscriber processing unit (200 ₁ -200 _2), the switching device 150 is connected to the cross manner. Specifically AA port of a subscriber processor (200 ₁ -200 _2, 211 _1, 211 ₂₎ is connected to each port AA (s11) of the switching device 150. AB port of a subscriber processor (200 ₁ -200 _2, 212 _1, 212 ₂₎ is connected to each port BA (s21) of the switching device 150. BA port of a subscriber processor (200 ₁ -200 _2, 221 _1, 221 ₂₎ are connected respectively to the AB port (s12) of the switching device 150. BB port of a subscriber processor (200 ₁ -200 _2, 222 _1, 222 ₂₎ are connected respectively to the BB port (s22) of the switching device 150.

In the subscriber processing apparatus connection system configured as described above, it is conventionally determined whether only the receiving port is normal, and it is not determined whether the transmitting port is bad. Therefore, in the conventional subscriber processing device connection system, there is a problem in that data is not transmitted or received between two devices, so-called isolation of a subscriber data path.

Referring to FIG. 5, for example, it is assumed that the A board 210 ₁ of the first subscriber processing apparatus 200 ₁ is active and the AA port 211 ₁ is selected as the reception port. It is also assumed that the A board 210 ₂ of the second subscriber processing apparatus 200 ₂ is active, and the AA port 211 ₂ is selected as the receiving port. Such active board and the selection of the receiving port may be performed in the initialization process after the subscriber processing unit (200 ₁ -200 ₂₎ is mounted on the system. At this time, the selection method may be performed using any known technique. In this state, if the AA port 211 ₁ of the first subscriber processing apparatus 200 ₁ is inferior, the data received at the AA port 211 ₂ of the second subscriber processing apparatus 200 ₂ is processed by the first subscriber processing. Since it originates from the AA port 211 ₁ of the apparatus 200 ₁ , the second subscriber processing apparatus 200 ₂ cannot properly receive data.

As described above, in the conventional subscriber processor connection system, it is determined whether the reception port is defective. Therefore, the AA port 211 ₁ of the first subscriber processor 200 ₁ may be detected as defective, but the AA port 211 ₂ of the second subscriber processor 200 ₂ is detected as not defective, The second subscriber processing apparatus 200 ₂ does not detect that the data reception is failing. Therefore, even if the first subscriber processor 200 ₁ detects a defect of the AA port 211 ₁ and transfers the receiving port to the AB port 212 ₁ , the reception of the first subscriber processor 200 ₁ is performed. The problem is solved, but the second subscriber station 200 ₂ still has problems with data reception. This is because switching of the receiving port only changes the port selected by the selector in the subscriber processing apparatus, and no action is taken on the outside. In this case, there is a so-called isolation of the subscriber data path, which does not continuously receive data even when the device is normal.

As such, the connection technology of the conventional subscriber processor does not detect the link cable between the activated subscriber processor and the redundant switching device, even if a problem occurs in the port processor of the subscriber processor that is transmitting or a long time. Only after this time did the detection occur, causing the service to disconnect. In addition, since the conventional technology determines only whether a reception port is bad, even if the reception port of a bad device is changed, other normal subscriber processing devices that receive data transmitted from the bad port continue to fail in data reception, resulting in service disconnection. I had a problem that occurred.

Accordingly, an object of the present invention is to provide a subscriber processing device that can maintain a continuous service by detecting the real-time isolation of subscriber data due to a port or cable failure between the subscriber processing device and the switching device; The present invention provides a method for setting a receiving port of a subscriber processor.

Subscriber processing apparatus according to an embodiment of the present invention, a device for performing a matching function between the subscriber device and the switching device, and includes a transceiver for interfacing with the switching device for transmitting and receiving data with the switching device. The transceiver includes a first port and a second port, forwards data to the first port and the second port in a transmission operation, and selects one of the first port and the second port in a reception operation. Receive data from the port. The transceiver includes a diagnostic message generator for generating a diagnostic message including information on the selected port and a diagnostic for controlling the diagnostic message to be periodically transmitted through the first port and the second port of the transceiver. The apparatus further includes a message transmitter.

A subscriber processing apparatus according to an embodiment of the present invention includes a first subscriber board and a second subscriber board, wherein the first and second subscriber boards are mutually exclusively in an active state or a standby state. Each of the first board and the second board includes a transceiver for interfacing with the switching device to transmit and receive data with the switching device. The transceiver includes a first port and a second port, and receives data from a selected port of either the first port or the second port. The transceiver includes a diagnostic message receiver for receiving a diagnostic message and a port controller for performing an operation of changing or maintaining the selected port in response to the reception of the diagnostic message.

Subscriber processing apparatus according to an embodiment of the present invention, Preferably, the first and second transceivers, respectively, a counter for counting a message reception failure; And an apparatus switching unit for changing the standby transceiver unit to an active state when the counter exceeds a predetermined number of times.

The subscriber processor connection system according to the present invention includes at least one reference subscriber processor according to an embodiment of the present invention, a plurality of general subscriber processor units according to an embodiment of the present invention, and a switching device. And a first transceiver and a second transceiver, each of the first and second transceivers including a first port and a second port. The first and second ports of the transceiver of the first subscriber board of the subscriber processors are connected to the first ports of the first and the second transceiver of the switching device, respectively, The first and second ports of the transceiver of the two subscriber boards are connected to the second ports of the first and second transceivers of the switching device, respectively.

Receiving port setting method of the subscriber processing apparatus according to the present invention, the first subscriber processing apparatus, generating a diagnostic message including the information of the receiving port, and

At the first subscriber processing device, periodically transmitting the generated diagnostic message to a second subscriber processing device.

Hereinafter, embodiments of the present invention will be described in more detail with reference to FIGS. 6-9.

6 is a block diagram showing a reference subscriber processing apparatus according to the present invention. As shown, the subscriber processing apparatus 300 includes two boards having the same function and configuration including transmission and reception, that is, the A board 310 and the B board 320. Each board 310, 320 includes a transceiver 318, 328 that is directly related to transmission and reception, and a data processor 319, 329 that performs the general functions of the subscriber processor. The configuration of the data processing units 319 and 329 is the same as that of the data processing unit 219 of the conventional subscriber processing apparatus 200 described above with reference to FIGS. 3-4.

The transceivers 318 and 328 have two ports 311 and 312 and 321 and 322, distributors 315 and 325, selectors 317 and 327, diagnostic message generators 3181 and 3281 and diagnostic message transmitters 3318. , 3282). Transmission and reception is performed only on the active board among the two transceivers 318 and 328, and at this time, the functions of the two ports 311 and 312 and 321 and 322, the distributors 315 and 325 and the selectors 317 and 327 The operation is the same as the functions / operations of ports 211 and 212 and 221 and 222, distributors 215 and 225 and selectors 217 and 227 of the conventional subscriber processor 200 described above with reference to FIGS. Hereinafter, for convenience, it will be described assuming the active state of the A board (310).

The diagnostic message generator 3318 generates a diagnostic message. The diagnostic message may include information on the selected receiving port. For example, when data of the AA port 311 is selected by the selector 317 when receiving, the diagnostic message may include information about the AA port 311 which is the selected receiving port.

The diagnostic message transmitter 3322 periodically transmits the diagnostic message to the other subscriber processing apparatus through the two ports 311 and 312. The duration of the diagnostic message may be preferably set to a time sufficient to detect real-time data path isolation without overloading the subscriber processing unit. According to an embodiment of the present invention, the period of the diagnostic message may be set to 0.1 second.

7 is a block diagram showing a general subscriber processing apparatus according to the present invention. As shown, the subscriber processing apparatus 400 includes two boards having the same function and configuration including transmission and reception, that is, the A board 410 and the B board 420. Each board 410, 420 includes a transceiver 418, 428 that is directly related to transmission and reception, and a data processor 419, 429 that performs the general functions of the subscriber processor. The configuration of the data processing units 419 and 429 is the same as that of the data processing unit 219 of the conventional subscriber processing apparatus 200 described above with reference to Figs.

Transceivers 418 and 428 are two ports 411 and 412 and 421 and 422, distributors 415 and 425, selectors 417 and 427, diagnostic message receivers 4141 and 4281 and receiver port maintain / change units. (4182, 4282). The transceivers 418 and 428 may preferably further include counters 4183 and 4283 and device switching units 4184 and 4284. Transmission and reception is performed only on the active board of the two transceivers 418 and 428, at which time the functions of the two ports 411 and 412 and 421 and 422, the splitters 415 and 425 and the selectors 417 and 427 / The operation is the same as the functions / operations of ports 211 and 212 and 221 and 222, distributors 215 and 225 and selectors 217 and 227 of the conventional subscriber processor 200 described above with reference to FIGS. Hereinafter, for convenience, it will be described assuming the active state of the A board 410.

The diagnostic message receiver 4141 receives the diagnostic message through the two ports 411 and 412 by waiting for a predetermined predetermined period. The predetermined period here is preferably such that real-time data path isolation can be detected without overloading the subscriber processing device and, like the reference subscriber processing device, can be 0.1 second.

Receiving port holding / changing section 4142 interprets the received diagnostic message and sets the receiving port included in the diagnostic message and the receiving port selected by selector 417 to be the same. For example, when the receiving port included in the diagnostic message is the AA port 311 and the receiving port selected by the selector 417 is the AA port 411, the receiving port holding / changing unit 4142 maintains the receiving port as it is. do. On the other hand, if the receiving port selected by the selector 417 is the AB port 412, the receiving port holding / changing unit 4142 transmits a port control signal to the selecting unit 417 to transfer the receiving port to the AA port 411. Change it.

By applying this approach, the receiving ports of all subscriber processing units are connected to one switching unit board. This unified management facilitates the detection of problematic devices.

Continuing with reference to FIG. 7, the counter 4183 may increase the count in response to the reception result of the diagnostic message receiver 4141. For example, if the reception of the diagnostic message fails, the count is incremented. The counter may also reset the count to zero, preferably upon successful reception of the diagnostic message. The reason for resetting the count to zero upon receiving the diagnostic message is to count only the cases where the reception fails continuously to exclude such a case because the diagnostic message may not be received by chance even if the port is not defective.

When the count of the counter 4183 exceeds a predetermined number of times, the device switching unit 4148 changes the standby board to the active state. Here, the predetermined number may be appropriately determined according to the system as the number of consecutive reception failures that can be assured that the reception port is bad. According to one embodiment of the present invention, if the count of the counter 4183 exceeds, for example, three times, the device switching unit 4148 may change the B board 420 into an active state. Thereafter, data is transmitted and received at the B board 420.

That is, the subscriber processor connection system according to the present invention has a problem by transmitting a diagnostic message from the reference subscriber processor instead of changing the bad reception port by determining only the receiving port in a data transmission / reception situation between the conventional subscriber processors. Change the board of the device. By such a configuration, it is possible to detect the problem device itself and change the state of the device. Therefore, when only the failure of the conventional receiving port is detected and the receiving port of the device is changed, it is possible to prevent a data isolation phenomenon in which the other device continuously fails to receive data.

The present invention can also detect in real time whether or not a diagnostic message has been received once the data reception has failed. In addition, according to the present invention, even if each board fails one by one, the standby board is changed to an active state so that when a subscriber data isolation occurs, other normal boards are operated so that the subscriber data path is always maintained. You can continue to receive services.

FIG. 8 is a connection diagram illustrating a method of connecting the reference subscriber processor of FIG. 6 to the general subscriber processor and the switching device of FIG. (-400 400 _{1 2)} Figure 8 is a general subscriber processing device is only two are shown. However, a subscriber apparatus connected to the system of the present invention is not limited to such an arrangement, many more general subscriber processing unit (400 ₁ -400 It may include ₂ ).

Subscriber processing unit (300, 400 ₁ -400 ₂₎ and the switching device 150 is connected to the cross manner. Specifically subscriber processing device _{(300, 400 1 -400 2)} AA port (311, 411 _1, 411 ₂₎ is connected to each port AA (s11) of the switching device 150. Subscriber processing device (300, 400 ₁ -400 ₂₎ of the AB port (312, 412 _1, 412 ₂₎ is connected to each port BA (s21) of the switching device 150. Subscriber processing device _{(300, 400 1 -400 2)} BA port (321, 421 _1, 421 ₂₎ are connected respectively to the AB port (s12) of the switching device 150. Subscriber processing device _{(300, 400 1 -400 2)} BB port (322, 422 _1, 422 ₂₎ are connected respectively to the BB port (s22) of the switching device 150. In FIG. 8, in the reference subscriber device 300, the A board 310 is active, the AA port 311 is selected as the receiving port, and the first subscriber device 400 ₁ has the A board 410 ₁ active. , AA port 411 ₁ is selected as the receiving port, and in the second subscriber device 400 ₂ , the B board 420 ₂ is active and the BA port 421 ₂ is selected as the receiving port. Hereinafter, a reception port setting method for bringing this into a state will be described.

Based on the subscriber unit 300 periodically generates a diagnostic message is sent to the first and second general subscriber processing unit (400 ₁ -400 _2). As described above, the diagnostic message may include information about a reception port of the reference subscriber device 300. For example, the diagnostic message may include AA port 311 information of the reference subscriber device 300.

First and second general subscriber processing unit (400 ₁ -400 ₂₎ to match the receiving port and the self-receiving port of the received diagnostic message to wait for the agreed period after, a diagnostic message. If the receiving port of the diagnostic messages AA port 311 one time, the first and the second common port, each AA receiving port of a subscriber processor _{(400 1 -400 2) (411} 1), BA port (421 _2), Since the receiving port matches port A, keep the port as it is. On the other hand, the first and second general subscriber processing unit (400 ₁ -400 ₂₎ receive port, each port AB (412 _1), BB port (422 _2), then the receive ports do not match based on subscriber processing device (300 in The port holding / changing unit 4142 ₁ , 4282 ₂ (FIG. 7) changes the receiving port to the AA port 411 ₁ and the BA port 421 ₂ so as to match the receiving port. In all subscriber processing unit (300, 400 ₁ -400 ₂₎ via the same control can be connected to a board (s10) of the switching device 150, and this management is centralized along.

At this time, assume that the AA port 411 ₁ of the first general subscriber processor 400 ₁ is defective. In this case, the first general subscriber processor 400 ₁ cannot receive a diagnostic message transmitted by the reference subscriber processor 300 because the receiving port is bad, so that the count of the counter 4183 ₁ ; Is increased. If the count is more than a predetermined number of times, for example three times, the device switching unit 4184 ₁ (FIG. 7) changes the B board 410 ₁ of the first general subscriber processor 400 ₁ to an active state. Therefore, data transmission and reception of the first general subscriber processor 400 ₁ is performed through the B board 410 ₁ . As such, the normal device including the second general subscriber processing unit 400 ₂ has a problem in receiving by switching the board itself instead of the switching of the receiving port in the first general subscriber processing unit 400 _{1 in} which the bad port is detected. You will not.

9 is a flowchart illustrating a method for setting a receiver processing device receiving port according to the present invention.

In the method 600 for setting a subscriber processing unit receiving port, the reference subscriber processing unit 300 (FIG. 8) first generates a diagnostic message (601). As described above, the diagnostic message may include information about a reception port of the reference subscriber processing device. Based on subscriber processing device 300 is the generated diagnostic messages general subscriber processing device; and transmits the (400 ₁ -400 ₂₈ Fig. 602). The generation and transmission of the diagnostic message may be repeatedly performed at predetermined intervals, for example, every 0.1 seconds, as described above.

A general subscriber processing unit (400 ₁ -400 _2), receives the diagnostic message sent by the subscriber based on processor 300 (603). If the general subscriber processing unit (400 ₁ -400 _2), preferably succeeds in receiving diagnostic messages, it is possible to reset the count to zero (604). As described above, this is to exclude from the count if a diagnostic message is not received by accident even if the port is not defective. Next, it is checked whether the receiving port of the reference subscriber processing apparatus 300 and the receiving port thereof are the same in the received diagnostic message (605). If it is the same, leave it as it is, otherwise change its receive port (606).

In operation 603, when the reception of the diagnostic message fails, the count is increased by one (607). Next, it is checked whether the count exceeds a predetermined number of times (608). When the count exceeds a predetermined number of times, for example, three times, the standby board is changed to the active state (609).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Such a method and apparatus of the present invention have been described with reference to the embodiments shown in the drawings for clarity, but these are merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

According to the subscriber processing apparatus and the receiving port setting method of the subscriber processing apparatus of the present invention, the following effects can be obtained.

First, all subscriber processors are connected to a single switching board for uniform management.

Second, it is possible to detect the problematic processing device itself and change the state of the device. Therefore, it is possible to prevent a data isolation phenomenon in which failure occurs continuously in receiving data from another device.

Third, once a failure occurs in data reception, it may be detected in real time through the reception of a diagnostic message.

Fourth, in each processing unit, even if each board fails one by one, if the subscriber data isolation occurs by changing the standby board to an active state, another normal board operates to maintain the subscriber data path at all times. Can continue to receive services.

Claims (7)

A subscriber processing device that performs a matching function between a subscriber device and a switching device, And a transceiver configured to interface with the switching device to transmit and receive data with the switching device. The transceiver includes a first port and a second port, forwards data to the first port and the second port in a transmission operation, and selects one of the first port and the second port in a reception operation. Receive data from the port, The transceiver includes a diagnostic message generator for generating a diagnostic message including information on the selected port and a diagnostic for controlling the diagnostic message to be periodically transmitted through the first port and the second port of the transceiver. The subscriber processing apparatus further comprises a message transmitter. A subscriber processing device that performs a matching function between a subscriber device and a switching device, A first subscriber board and a second subscriber board, wherein the first and second subscriber boards are mutually exclusively active or in a standby state; Each of the first subscriber board and the second subscriber board includes a transceiver for interfacing with the switching device to transmit and receive data with the switching device. The transceiver includes a first port and a second port, and receives data from a selected port of any one of the first port or the second port, The transceiver includes a diagnostic message generator for generating a diagnostic message including information on the selected port and a diagnostic for controlling the diagnostic message to be periodically transmitted through the first port and the second port of the transceiver. The subscriber processing apparatus further comprises a message transmitter. The method of claim 2, The transceiver further includes a diagnostic message receiver for receiving a diagnostic message and a port controller for changing or maintaining the selected port in response to the reception of the diagnostic message. The method of claim 3, wherein the transceiver unit, A counter for counting message reception failures; And When the counter exceeds a predetermined number of times, the device switching unit for changing the standby board to the active state Subscriber processing device further comprising. As a receiving port setting method of a subscriber processing device, Generating, at the first subscriber processing device, a diagnostic message comprising information of a receiving port; Periodically transmitting, by the first subscriber processing device, the generated diagnostic message to a second subscriber processing device; Receiving, at the second subscriber processing apparatus, a diagnostic message including information of a receiving port of the first subscriber processing apparatus, and At the second subscriber processing device, changing or maintaining its own receiving port in response to receiving the diagnostic message. The method of claim 5, Periodically checking whether the second subscriber processor receives a diagnostic message transmitted from the first subscriber processor; Incrementing a count if it fails to receive the transmitted diagnostic message as a result of the checking, and Changing the standby board to an active state when the count exceeds a predetermined number of times. As a receiving port setting method of a subscriber processing device, Generating, at the first subscriber processing device, a diagnostic message including information of a reception port, Periodically transmitting, by the first subscriber processing device, the generated diagnostic message to a second subscriber processing device; Periodically checking whether the transmitted diagnostic message is received by the second subscriber processing apparatus; Incrementing a count if it fails to receive the transmitted diagnostic message as a result of the checking, and Changing the standby board to an active state when the count exceeds a predetermined number of times.

Images