JP2000004275A - Transmission/reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the signal of higher priority preferentially rather than the signal of lower transmission priority through a transmission line for originally transmitting the signal of lower priority even when any fault occurs on a transmission line for transmitting the signal of higher priority. SOLUTION: Concerning this transmission/reception system, even when any fault occurs on a first transmission line L1, since a first signal S1 of higher transmission priority is transmitted through a second transmission line L2 preferentially rather than a second signal S2 of lower transmission priority, the transmission of the first signal S1 is maintained. Similarly, even when any fault occurs on a third transmission line L3, since a third signal S3 of higher transmission priority is transmitted through a fourth transmission line L4 preferentially rather than a fourth signal S4 of lower transmission priority, the transmission of the third signal S3 is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transmission / reception system used in a synchronous communication device.

[0002]

2. Description of the Related Art Conventionally, a transmission / reception unit of a transmission / reception system has a transmission line changeover switch on a receiving side. The configuration of this system is a redundant configuration (for example, see Japanese Patent Laid-Open No. 9-247196).
Publication "Path switching control system"). That is, even if a failure occurs in one transmission path, the transmission / reception unit transmits the same signal via the other transmission path in which no failure has occurred. Therefore, communication does not stop.

As another conventional technique, a transmission / reception unit of a transmission / reception system transmits two different signals individually via two transmission paths without providing a transmission path changeover switch on the receiving side. . Therefore, the latter transmission / reception system transmits up to twice as many signals as the former transmission / reception system.

[0004]

However, in the latter transmission / reception system having two parallel transmission lines, if a failure occurs in one of the transmission lines, signals cannot be transmitted through this transmission line. If the transmission priority of the signal on this transmission path is higher than the transmission priority of the signal on the other transmission path where no failure has occurred, the damage is greater. Therefore, there has been a demand for a transmission / reception system that can preferentially transmit a signal having a high transmission priority when a failure occurs in a transmission path.

[0005]

To achieve this object, a transmission / reception system according to the present invention comprises a first transmission / reception unit including a first transmission selector and a first reception selector, and a second transmission selector and a second reception selector. A second transmission / reception unit, first and second transmission paths for individually transmitting the first and second signals from the first transmission selector to the second reception selector, and a third transmission path from the second transmission selector to the first reception selector.
And fourth and fourth transmission paths for individually transmitting the first and fourth signals, respectively.

The first transmission / reception unit further detects a failure that has occurred in the third transmission path, and switches the first transmission signal to the fourth transmission path by prioritizing the third signal over the fourth signal. To the first reception selector, and a first fault signal detector for generating a first trigger signal; a first game alarm signal generated in response to the first trigger signal; A first alarm signal generator which is inserted into the first signal or the second signal and is transmitted to the first transmission line or the second transmission line, respectively.

The second transmission / reception unit further detects a failure that has occurred in the first transmission line, and switches the second transmission line to the second transmission line so that the first signal is prioritized over the second signal and transmitted. To a second reception selector, and a second fault signal detector for generating a second trigger signal; generating a second game alarm signal in response to the second trigger signal; A second game alarm signal generator which is inserted into the third signal or the fourth signal and transmitted to the third transmission path or the fourth transmission path, respectively.

[0008] The first transmitting / receiving section further responds to the second game alarm signal by giving priority to the first signal over the second signal.
A second game alarm signal detector for sending a third switching signal to the first transmission selector for switching to a transmission path for transmission;

The second transmission / reception unit further gives priority to the third signal over the fourth signal in response to the first game alarm signal, and outputs the fourth signal.
A first game alarm signal detector for sending a fourth switching signal for switching to a transmission path for transmission to a second transmission selector.

According to such a configuration, even if a failure occurs in the first transmission line among the first and second transmission lines arranged in parallel, the first signal has priority over the second signal, and Since the transmission is switched to the second transmission path, the communication of the first signal is not hindered. Similarly, the third and fourth parallel
Even if a failure occurs in the third transmission path among the transmission paths, the third signal is given priority over the fourth signal and is switched to the fourth transmission path for transmission, so that communication of the third signal is not hindered.

Preferably, the first signal has a higher transmission priority than the second signal, and the third signal has a higher transmission priority than the fourth signal. .

According to such a configuration, the first and the third
The first and third signals having a higher transmission priority are transmitted through the transmission path, respectively, and the second and fourth transmission paths are transmitted through the transmission path.
Signals can be transmitted by designating in advance such that the second and fourth signals having lower transmission priorities are transmitted. Therefore, even if a failure occurs in the first and third transmission paths, the first and third signals having higher transmission priorities are respectively transmitted prior to the second and fourth signals having lower transmission priorities. Therefore, transmission of the first and third signals is not hindered. Thus, damage is minimized.

[0013] Further, preferably, a fault occurring in the first and third transmission paths is determined by a path alarm indication by pointer interpretation recommended in the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). The first and second game alarm signals may be detected as path remote defect indications (P-RDIs) by detecting the first and second game alarm signals (P-AIS) (hereinafter referred to as International Telecommunication Union Telecommunication Standardization). IZation Sector (ITU-T)
The path alarm indication signal (P-AIS) is called TU-T and the path remote defect indication (P-AIS) is called P-AIS.
-RDI) is referred to as P-RDI).

Alternatively, preferably, a failure occurring in the first and third transmission paths is detected by a loss of pointer (LOP) based on pointer interpretation recommended by the ITU-T, and the first and second game alarms are detected. Signal is PR
DI (hereinafter referred to as a loss of pointer (L
OP) is referred to as LOP).

Alternatively, preferably, a fault occurring in the first and third transmission paths is detected by a bit interleave parity (BIP) operation recommended by the ITU-T, and the first and second game alarm signals are detected. And a path remote error indication (P-REI) (hereinafter, bit interleaved parity (BIP) is referred to as BIP, and path remote error indication (P-REI) is referred to as P-REI).

Alternatively, preferably, a failure occurring in the first and third transmission paths is detected by a P-AIS, LOP, or BIP operation recommended in each ITU-T, and the first and second game stations are detected. It is preferable to insert each of the alarm signals into the path overhead (POH) (hereinafter, the path overhead (POH) is
OH).

As described above, the transmission / reception system uses the ITU-
It uses an international standard protocol recommended by T, that is, does not use a special communication protocol. Therefore, it is not necessary to newly add a circuit for switching the first reception selector, the first transmission selector, the second reception selector, or the second transmission selector. Therefore, this transmission / reception system can be easily and inexpensively created.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a transmission / reception system according to an embodiment of the present invention; It should be noted that the drawings are only schematically shown to the extent that the present invention can be understood, and therefore, the present invention is not limited to the illustrated examples.

First, a transmission / reception system according to the present invention will be schematically described with reference to FIGS.

FIGS. 1, 2 and 3 are diagrams schematically showing an example of the configuration of the transmission / reception system of the present invention. In particular, FIG. 1 shows a signal flow in a normal state, and FIG. Road L1
3 shows a signal flow when a failure occurs in L3, and FIG. 3 shows a signal flow after selector switching.

The transmitting / receiving system of the present invention comprises first and second transmitting / receiving sections 10 and 20, and first, second, and third transmitting / receiving sections.
And fourth transmission lines L1, L2, L3 and L4. The first transmission / reception unit 10 includes a first transmission selector 11, a first transmission
Receiving selector 12, first fault signal detector 13, first game alarm signal generator 14, and second game alarm signal detector 15
Equipped. Similarly, the second transmission / reception unit 20 includes a second transmission selector 21, a second reception selector 22, a second fault signal detector 23, a second game alarm signal generator 24, and a first game alarm signal detector 25. . In addition, each of the devices of the first and second transmitting / receiving units 10 and 20 may be located outside the devices 10 and 20. For example, the first transmission selector 11 may be located outside the first transmission / reception unit 10.

The first and second transmission lines L1 and L2 are:
The first transmission selector 11 and the second reception selector 22 are connected, and the third and fourth transmission paths L3 and L4
Are the second transmission selector 21 and the first reception selector 12
Are connected.

Next, the function of each device of the transmission / reception system will be described.

The first and second transmission lines L1 and L2 are:
From the first transmission selector 11 to the second reception selector 22, the first
And the second signals S1 and S2 are individually transmitted.

The third and fourth transmission lines L3 and L4 are:
From the second transmission selector 21 to the first reception selector 12, a third
And the fourth signals S3 and S4 are individually transmitted.

The first fault signal detector 13 is connected to the third transmission line L
3, a first switching signal C1 for switching the third signal S3 to the fourth transmission path L4 for transmission by prioritizing the third signal S3 over the fourth signal S4 is transmitted to the first reception selector 12, , And generates a first trigger signal T1.

The first game alarm signal generator 14 generates a first game alarm signal K1 in response to the first trigger signal T1, and converts the first game alarm signal K1 into the first signal S1 or the second signal S2. Insert the first transmission line L1 or the second transmission line L
2 respectively.

The second fault signal detector 23 is connected to the first transmission line L
1 to output a second switching signal C2 to the second reception selector 22 for switching the first signal S1 to the second transmission path L2 for transmission by giving priority to the first signal S2 over the second signal S2, , And a second trigger signal T2.

The second game alarm signal generator 24 generates a second game alarm signal K2 in response to the second trigger signal T2, and converts the second game alarm signal K2 into a third signal S3 or a fourth signal S4. Insert the third transmission path L3 or the fourth transmission path L
4 respectively.

The second game alarm signal detector 15 converts the first signal S1 into the second signal S2 in response to the second game alarm signal K2.
, And sends a third switching signal C3 to the first transmission selector 11 for switching to the second transmission path L2 for transmission.

The first game alarm signal detector 25 converts the third signal S3 into the fourth signal S4 in response to the first game alarm signal K1.
And a fourth switching signal C4 for switching to the fourth transmission line L4 for transmission to the second transmission selector 21.

First, the operation of the transmission / reception system in a normal state will be described.

In a normal state, the first and second signals S1 and S2 individually sent from the external signal source to the first transmission selector 11 via the first and second transmission lines L1 and L2 are the first and second signals, respectively. The signals are individually output from the transmission terminals (output terminals) of the two transmission lines L1 and L2. That is, the first transmission selector 11 operates in the normal transmission mode. At the same time, in a normal state, the second reception selector 2
2 is the first through the first and second transmission lines L1 and L2.
The first and second signals S1 and S2 sent from the transmission selector 11 are converted into first and second transmission lines L1 and L
2 to the outside from the sending terminals (output terminals). That is, the second reception selector 22 operates in the normal transmission mode.

Similarly, during normal operation, the third
The third and fourth signals S3 and S4 individually sent to the second transmission selector 21 via the third and fourth transmission lines L3 and L4 are output from the transmission terminals (output terminals) of the third and fourth transmission lines L3 and L4. ) Are output individually. That is, the second transmission selector 21 operates in the normal transmission mode. At the same time, in a normal state, the first reception selector 12 outputs the third and fourth signals S3 and S4 sent from the second transmission selector 21 via the third and fourth transmission lines L3 and L4 to the third and fourth signals. Transmission line L3
And L4 from the sending terminal (output terminal) to the outside. That is, the first reception selector 12
Operate in the normal transmission mode (FIG. 1).

The transmission / reception system described above is used in ITU-T
A description will be given of an example in which a synchronous digital hierarchy (SDH) device recommended by (for example, ITU-T G707) is used (hereinafter, a synchronous digital hierarchy (SDH) device is referred to as an SDH device).
Device). In this case, the transmitting and receiving system
An international standard protocol recommended by the TU-T is used, that is, a special communication protocol need not be used.

Next, the operation of the transmission / reception system when a failure occurs in the first transmission line L1 will be described.

In the above case, the second fault signal detector 23
A failure occurring in the first transmission line L1 is detected. The second fault signal detector 23 responds to this fault detection by responding to the first signal S.
1 is transmitted to the second reception selector 22 to switch the signal to the second transmission path L2 prior to the second signal S2 and transmit the second switching signal C2 to the second reception selector 22 and generate the second trigger signal T2 (FIG. 2). .

Subsequently, the second game alarm signal generator 24
A second game alarm signal K2 is generated in response to the second trigger signal T2, and the second game alarm signal K2 is inserted into the third signal S3 or the fourth signal S4, and the third transmission line L3 or the fourth The signal K2 is transmitted to the transmission line L4, and the signal K2 is transmitted to the first transmitting / receiving unit 10 during transmission.

Subsequently, the second game alarm signal detector 15
It receives the second game alert signal K2 and sends out the third switching signal C3 to the first transmission selector 11 in response to the signal K2 (FIG. 2). In response to the third switching signal C3, the first transmission selector 11 switches to the transmission mode in which the first signal S1 is given priority over the second signal S2 and is transmitted through the second transmission path L2 (FIG. 3). Therefore, when a failure occurs in the first transmission line L1, the first transmission line L1 becomes invalid, and the first signal S1 having a high transmission priority via the valid second transmission line L2.
Can be reliably transmitted from the first transmitting / receiving unit 10 to the second transmitting / receiving unit 20.

On the other hand, when the second fault signal detector 23 detects a fault that has occurred in the first transmission line L 1, a second switching signal C 2 is sent from this detector 23 to the second receiving selector 22. When the second switching signal C2 is input to the second reception selector 22, the selector 22 transmits the signal transmitted via the second transmission path L2 from the transmission terminal of the original first transmission path L1 to the outside. Switch to the transmission mode. Therefore, in response to the second switching signal C2, the second reception selector 22 changes the first signal S transmitted from the first transmission selector 11 via the second transmission line L2 from the normal transmission mode.
1 is switched to the transmission mode at the time of abnormality, which is transmitted from the transmission terminal of the first transmission path L1 of the second reception selector 22. The switching of the transmission mode of the second reception selector 22 is performed in synchronization with the switching of the transmission mode of the first transmission selector 11.

Next, the operation of the transmission / reception system when a failure occurs in the third transmission line L3 will be described.

In the above case, the first fault signal detector 13
A failure occurring in the third transmission line L3 is detected. The method of detecting this failure complies with, for example, an international standard protocol recommended by ITU-T described later. In response to the failure detection, the first failure signal detector 13 switches the first switching signal C1 for transmitting the third signal S3 to the fourth transmission path L4 by giving priority to the fourth signal S4. The signal is transmitted to the reception selector 12, and the first trigger signal T1 is generated (FIG. 2).

Subsequently, the first game alarm signal generator 14
A first game alarm signal K1 is generated in response to the first trigger signal T1, and the first game alarm signal K1 is converted to a first signal S1.
Alternatively, the signal K1 is inserted into the second signal S2 and sent to the first transmission line L1 or the second transmission line L2, respectively, and the signal K1 is sent to the second transmission / reception unit 20 during transmission.

Subsequently, the first game alarm signal detector 25
The first switching alarm signal K4 is transmitted to the second transmission selector 21 in response to the first game alarm signal K1 (FIG. 2). In response to the fourth switching signal C4, the second transmission selector 21 switches to the transmission mode in which the third signal S3 is given priority over the fourth signal S4 and is transmitted through the fourth transmission line L4 (FIG. 3). Therefore, when a failure occurs in the third transmission line L3, the third transmission line L3 becomes invalid, and the third signal S3 having a high transmission priority via the valid fourth transmission line L4.
Can be reliably transmitted from the second transmitting / receiving unit 20 to the first transmitting / receiving unit 10.

On the other hand, when the first fault signal detector 13 detects a fault that has occurred in the third transmission line L 3, a first switching signal C 1 is sent from the detector 13 to the first receiving selector 12. When the first switching signal C1 is input to the first reception selector 12, the selector 12 transmits the signal transmitted via the fourth transmission line L4 from the transmission terminal of the original third transmission line L3 to the outside. Switch to the transmission mode. Therefore, in response to the first switching signal C1, the first reception selector 12 changes the third signal S transmitted from the second transmission selector 21 via the fourth transmission line L4 from the normal transmission mode.
3 is switched to the abnormal transmission mode for transmission from the transmission terminal of the third transmission line L3 of the first reception selector 12. The switching of the transmission mode of the first reception selector 12 is performed in synchronization with the switching of the transmission mode of the second transmission selector 21.

As described above, even if a failure occurs in the first transmission line L1 of the first and second transmission lines L1 and L2 arranged in parallel, the first signal S1 has priority over the second signal S2. Then, the data is switched to the second transmission path L2 and transmitted. Similarly,
Even if a failure occurs in the third transmission line L3 of the third and fourth transmission lines L3 and L4 arranged in parallel, the third signal S3
Is transmitted prior to the fourth signal S4 and switched to the fourth transmission line L4.

The transmission priority of the first signal S1 is set higher than that of the second signal S2.
When the transmission priority is set higher than the fourth signal S4, the first and third signals S1 and S3 having the higher transmission priority are transmitted to the first and third transmission lines L1 and L3, respectively. In addition, signals can be transmitted by designating in advance so that the second and fourth signals S2 and S4 having a lower transmission priority are transmitted to the second and fourth transmission lines L2 and L4, respectively. Therefore, even if a failure occurs in the first transmission line L1, the first signal S1 having a higher transmission priority is transmitted via the second transmission line L2 in preference to the second signal S2 having a lower transmission priority. Therefore, the transmission of the first signal S1 is maintained. Similarly, the third transmission line L3
, The third signal S3 having a higher transmission priority
Are transmitted via the fourth transmission line L4 prior to the fourth signal S4 having a lower transmission priority, so that the transmission of the third signal S3 is maintained.

Further, the above-mentioned ITU-T (for example, IT
If the SDH device recommended in U-T G707) is used, the first reception selector 12 and the first transmission selector 1
1, the second reception selector 22 or the second transmission selector 2
There is no need to add a new circuit for switching 1. Therefore, this transmission / reception system can be easily and inexpensively manufactured.

If this SDH device is used, for example, first and second fault signal detectors 13 and 23 detect faults occurring in first and third transmission lines L1 and L3, respectively, by P-AIS based on pointer interpretation. Respectively, and both the first and second game alarm signals K1 and K2 can be set as P-RDI. Alternatively, the first and second fault signal detectors 13 and 23 detect faults occurring in the first and third transmission lines L1 and L3, respectively, by LOP based on pointer interpretation, and perform first and second game play. Both the alarm signals K1 and K2 can be set to P-RDI. Alternatively, the first and second fault signal detectors 1
3 and 23 are the first and third transmission lines L1 and L3
Can be respectively detected by BIP calculation, and both the first and second game alarm signals K1 and K2 can be set to P-REI. Alternatively, the first and second fault signal detectors 13 and 23 may detect faults occurring in the first and third transmission lines L1 and L3, respectively, by P-AIS based on pointer interpretation recommended by ITU-T or by pointer interpretation. Each of the first and second game alarm signals K1 and K2 can be inserted into the POH, respectively, detected by the LOP or BIP operation, respectively.

The present invention is not limited to the above embodiment, and various changes can be made according to the design.

For example, a third transmission / reception unit 30 is interposed between a first transmission line L1 and a third transmission line L3 for connecting the first transmission / reception unit 10 and the second transmission / reception unit 20, respectively. It is conceivable that the fourth transmission / reception unit 40 is interposed between the second transmission line L2 and the fourth transmission line L4 that connect the transmission / reception unit 10 and the second transmission / reception unit 20, respectively. FIGS. 4, 5 and 6 showing this modification are shown in FIGS. 1, 2 and 3, respectively.
Corresponding to Third and fourth transmission / reception units 30 and 40
Has the same functions as the first and second transmission / reception units 10 and 20, respectively. These third and fourth transmission / reception units 30
And 40 are the first and second transmission selectors 11
While receiving necessary signals from the first and second signals S1 and S2 respectively transmitted via the transmission lines L1 and L2, the third and fourth transmission / reception units 30 and 40 transmit the first and second signals, respectively. 2 transmission lines L1 and L
The signal required by the second transmission / reception unit 20 is added to the first and second signals S1 and S2, which are individually transmitted via the second transmission unit 2, and transmitted to the second reception selector 22, respectively. Similarly, the third and fourth transmission / reception units 30 and 40 transmit the third and fourth signals S3 and S4 individually transmitted from the second transmission selector 21 via the third and fourth transmission lines L3 and L4, respectively. While receiving necessary signals from the inside, the third and fourth transmission / reception units 30 and 40 respectively transmit the third and fourth signals S3 and S4 individually transmitted through the third and fourth transmission lines L3 and L4. And a signal required by the first transmission / reception unit 10, and transmits the signal to the first reception selector 12.

[0052]

As is apparent from the above description, according to the transmission / reception system of the present invention, even if a failure occurs in the first transmission line L1, the first signal S1 having a high transmission priority is transmitted in the transmission priority order. Priority is given to the second signal S2 having a lower priority and the second signal S2 is given priority.
Since the signal is transmitted via the transmission line L2, the transmission of the first signal S1 is maintained. Similarly, even if a failure occurs in the third transmission line L3, the third signal S3 having a higher transmission priority is transmitted via the fourth transmission line L4 prior to the fourth signal S4 having a lower transmission priority. Therefore, the transmission of the third signal S3 is maintained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining one configuration of a transmission / reception system of the present invention, particularly for explaining a signal flow in a normal state.

FIG. 2 is a diagram for explaining a signal flow when a failure has occurred in first and third transmission lines L1 and L3 of the transmission / reception system of the present invention.

FIG. 3 is a diagram for explaining a signal flow after selector switching in the transmission / reception system of the present invention.

FIG. 4 is a schematic diagram for explaining a configuration of a modified example of the transmission / reception system of the present invention, particularly a diagram for explaining a signal flow in a normal state.

FIG. 5 shows first and third transmission / reception systems shown in FIG. 4;
FIG. 9 is a diagram for explaining a signal flow when a failure occurs in the transmission lines L1 and L3.

6 is a diagram for explaining a signal flow after selector switching of the transmission / reception system shown in FIG. 4;

[Explanation of symbols]

 10: 1st transmission / reception unit 11: 1st transmission selector 12: 1st reception selector 13: 1st failure signal detector 14: 1st game alarm signal generator 15: 2nd game alarm signal detector 20: 2nd transmission / reception unit 21: second transmission selector 22: second reception selector 23: second fault signal detector 24: second game alarm signal generator 25: first game alarm signal detector 30: 30th transceiver 40: 40th transceiver C1: first switching signal C2: second switching signal C3: third switching signal C4: fourth switching signal K1: first game alarm signal K2: second game alarm signal S1: first signal S2: second signal S3: Third signal S4: Fourth signal T1: First trigger signal T2: Second trigger signal L1: First transmission line L2: Second transmission line L3: Third transmission line L4: Fourth transmission line

Claims (6)

[Claims] A first transmission / reception unit including a first transmission selector and a first reception selector; a second transmission / reception unit including a second transmission selector and a second reception selector; and the first transmission selector to the second reception selector. First
A first and a second transmission path for individually transmitting a second signal and a second signal respectively; and a third transmission path from the second transmission selector to the first reception selector.
Third and fourth transmission paths for individually transmitting the third signal and the fourth signal, respectively, and the first transmission / reception unit further detects a failure that has occurred in the third transmission path and converts the third signal into the fourth signal. A first failure signal detector for transmitting a first switching signal for switching to the fourth transmission path in preference to a signal for transmission to the first reception selector, and generating a first trigger signal;
A first game alarm signal is generated in response to a first trigger signal, and the first game alarm signal is inserted into the first signal or the second signal, and the first transmission line or the second transmission line is inserted. And a second game alarm signal generator for sending the first signal to the second signal, and the second transmitting / receiving unit further detects a fault that has occurred in the first transmission path, and gives priority to the first signal over the second signal. A second failure signal detector for transmitting a second switching signal for switching to the second transmission path for transmission to the second reception selector, and generating a second trigger signal;
A second game alarm signal is generated in response to a second trigger signal, and the second game alarm signal is inserted into the third signal or the fourth signal, and the third transmission path or the fourth transmission path is inserted. And a second game alarm signal generator for sending the first signal to the second signal, respectively, wherein the first transmission / reception unit further gives priority to the first signal over the second signal in response to the second game alarm signal,
A second switching alarm signal detector for transmitting a third switching signal for switching to the second transmission path and transmitting the switching signal to the first transmission selector; In response to the third signal, giving priority to the fourth signal,
A transmission / reception system, comprising: a first game alarm signal detector for sending a fourth switching signal for switching to the fourth transmission path for transmission to the second transmission selector. 2. The transmission / reception system according to claim 1, wherein the first signal has a higher transmission priority than the second signal, and the third signal has a higher transmission priority than the fourth signal. A transmission / reception system, wherein the order is set high. 3. The transmission / reception system according to claim 1, wherein the fault is determined by a path alarm indication by pointer interpretation recommended in International Telecommunication Union Telecommunication Standardization Sector (ITU-T). A transmission / reception system characterized in that the first and second game alarm signals are detected as path remote defect indications (P-RDI) by detecting the first and second game alarm signals by an indication signal (P-AIS). 4. The transmission / reception system according to claim 1, wherein the failure is determined by a pointer interpretation recommended by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). (LO
P) The transmission / reception system, wherein the first and second game alarm signals are detected as path remote defect indications (P-RDI). 5. The transmission / reception system according to claim 1, wherein the interfering bit is a bit interleaved parity (BIP) recommended in the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). The first and second game alarm signals are detected by calculation,
Path Remote Error Indication (PR
EI). 6. The transmission / reception system according to claim 1, wherein the fault is determined by a path alarm indication by pointer interpretation recommended in International Telecommunication Union Telecommunication Standardization Sector (ITU-T). Signal (P-AIS), loss of pointer (LOP) by pointer interpretation, or bit
Each of the first and second game alarm signals is detected by an interleaved parity (BIP) operation and
A transmission / reception system, wherein the transmission / reception system is inserted into an overhead (POH).