JP3410576B2 - Optical repeater monitoring system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission system composed of a multiplexing terminal device, an optical regenerator, an optical linear repeater, and an optical fiber transmission line connecting them.
The present invention relates to an optical repeater monitoring system for monitoring an optical regenerator and an optical linear repeater. The optical transmission system is recommended by International Telegraph and Telephone Consultative Committee (ITU-T) Recommendations G.707, G.708,
It complies with G.709.

[0002]

2. Description of the Related Art FIG. 14 shows the configuration of a conventional optical transmission system. In the figure, opposing multiplexing terminal equipment (line terminal multiplexer LT-MUX) 51 is connected via a plurality of optical repeaters 52 and optical fibers 53. The multiple low-speed optical signals are multiplexed with the high-speed optical signal by the multiplexing terminal device 51. The high-speed optical signal output from the multiplexing terminal device 51 is affected by signal power attenuation due to loss of the optical fiber, chromatic dispersion of the optical fiber, and waveform distortion due to nonlinearity. The optical repeater 52 is used for receiving and reproducing a high-speed optical signal, reducing the signal waveform deterioration in the optical fiber, and increasing the transmission distance between the multiplexing terminal equipment 51. The high-speed optical signal after transmission is again separated into a plurality of low-speed optical signals by the multiplexing terminal device 51.

In an SDH transmission system that complies with the new synchronous interface recommended by ITU-T, the monitoring function is enhanced by using the STM frame shown in FIG. 15 for both low speed and high speed signals to improve the system reliability. The STM frame is a maintenance and operation information area (section overhead, hereinafter referred to as "SOH"), which is approximately 3.3% of the transmission rate.
With. SOH is classified into RSOH, pointer, and multiple section overhead (hereinafter referred to as “MSOH”). RSOH is defined in the optical repeater and the multiplexing terminal equipment as frame synchronization, error monitoring, and transfer of maintenance and operation information. MSOH is defined as system redundancy system switching, error monitoring, and transfer of maintenance and operation information in a multiplexing terminal device. In the SDH transmission system, the optical repeater is S
The upper 3 rows (RSOH) of the SOH in the TM frame are processed, and the multiplexing terminal device sets the SOH 9 in the STM frame.
Process all rows (RSOH + MSOH).

In the conventional optical transmission system, in order to enable maintenance and operation from a remote place, as shown in FIG. 16, a multiplexing terminal station device 51, an optical repeater 52, and a maintenance and operation device 54 are provided respectively. A separate maintenance operation communication channel consisting of communication functions and connection lines is provided to send and receive maintenance operation information. By the way, an optical linear repeater has been developed which amplifies an optical signal as it is without reproducing the optical signal. Therefore, as the optical repeater 52 shown in FIG. 14, an optical linear repeater can be used together with the conventional optical regenerative repeater.
This optical linear repeater is cheaper than the optical regenerative repeater due to its simple structure, and the cost of the optical transmission system can be reduced by using it.

[0005]

In an optical transmission system in which a large number of optical repeaters are connected between multiplex terminal equipment, a separate maintenance operation communication channel is provided for each optical repeater as shown in FIG. The monitoring system provided is costly.
In particular, preparing a separate maintenance operation communication channel for a low-cost optical linear repeater is economically disadvantageous in terms of its configuration.

It is an object of the present invention to provide an optical repeater monitoring system capable of reducing the cost of the optical transmission system by reducing the communication channels for maintenance and operation for the optical regenerator and the optical linear repeater. To do.

[0007]

According to the present invention, individual maintenance operation communication channels provided between a maintenance operation apparatus and each optical repeater are aggregated as a communication channel with a multiplexing terminal station apparatus on one side or both sides. To do. Then, the STM in the SDH transmission system is provided between the multiplexing terminal device and the optical regenerator.
A communication channel using the same optical fiber as a transmission medium is realized by using D1, D2, D3 bytes in RSOH included in the frame. Further, as a communication channel between the multiplexing terminal device and the optical linear repeater, a channel in the LSV for monitoring the optical linear repeater is used, and a communication channel using the same optical fiber as a transmission medium is realized. . As a result, a maintenance operation communication channel different from the main signal is set in the transmission frame or in the same optical fiber, and each optical repeater is remotely monitored via the multiplexing terminal equipment.

FIG. 1 shows the basic configuration of the optical repeater monitoring system of the present invention. In the figure, the multiplexing terminal equipment 11 facing each other has a plurality of optical regenerators 12 and optical linear repeaters 13.
Connected via. A maintenance / operation communication channel including a communication function and a connection line is set between the multiplexing terminal device 11 and the maintenance / operation device 14. Multiplexing terminal device 11
Has a function of monitoring the optical regenerator 12 and the optical linear repeater 13 and a function of communicating with each optical repeater, in addition to the function of communicating with the maintenance operation device 14. In addition, the optical regenerator 1
2 and the optical linear repeater 13 have a function of monitoring the relay section and a communication function with the multiplexing terminal equipment. By using these functions, remote maintenance operation of the optical regenerator 12 and the optical linear repeater 13 connected between the multiplexing terminal equipment 11 is performed.

As a method of transferring information on the maintenance operation communication channel between the multiplexing terminal equipment 11, the optical regenerator 12 and the optical linear repeater 13, one maintenance operation communication channel is used and each optical repeater is used. The method of transferring in relay type while terminating the transfer information is adopted. Each optical repeater discriminates whether the transferred maintenance operation information is addressed to its own device or another device, and if it is addressed to its own device, it performs monitoring control processing according to the information content. If it is addressed to another device, the transferred maintenance / operation information is transferred to the adjacent optical repeater.

A plurality of optical regenerators 12 and an optical linear repeater 1
In the optical repeater monitoring system in which 3 is present, the optical regenerator 12 not only transfers information to another optical regenerator 12, but also transfers information (LSV) to the optical linear repeater 13 connected therebetween. Channel) is also required. Further, it is necessary to transfer not only the information from the optical regenerator 12 but also the information from the optical linear repeater 13 to the multiplexing terminal equipment 11.
Therefore, in the optical regenerator 12, as shown in FIG.
Information is branched from a communication channel using RSOH to a communication channel using a channel in LSV, and information is merged from a communication channel using a channel in LSV to a communication channel using RSOH.

Here, due to the branching / merging of information in the optical regenerators 12, a plurality of the same information A is generated each time passing through each optical regenerator 12, as shown in FIG. When a plurality of commands indicating control commands are issued from the maintenance / operation device to each optical repeater due to the branching / merging described above, each optical repeater receives a plurality of commands having the same content generated from one control command. In each optical repeater, a response is returned for each one, and a plurality of responses are returned for one control command. In order to prevent such a situation, in the optical repeater monitoring system of the present invention, the transferred information is terminated by the optical regenerator 12, and the optical regenerator 12 transfers the transferred information from the multiplexing terminal equipment 11. It has an algorithm for determining whether the command is a command or a response from each optical repeater, and changing the information transfer method according to the determination result.

[0012]

The multiplexing terminal device has a communication function with the maintenance operation device, each optical repeater and a maintenance operation communication channel in the transmission frame (for example, D1 and D2 in RSOH included in the STM frame in the SDH transmission frame). , D3 bytes)
Alternatively, it has a communication function of transmitting and receiving maintenance operation information using a channel in the LSV, and a function of monitoring each optical repeater from the maintenance operation information. Each optical repeater has a function of monitoring a repeater section including a connected optical fiber and a communication function of transmitting and receiving maintenance operation information using a maintenance operation channel in a transmission frame or a channel in LSV. By using these functions, the optical regenerator and the optical linear repeater connected between the multiplexing terminal equipment are remotely monitored via the multiplexing terminal equipment. As a result, it is possible to reduce the number of individual maintenance / operation communication channels conventionally provided between the maintenance / operation device and each optical repeater.

Further, each optical repeater discriminates whether the maintenance operation information transferred via the communication channel provided between the optical repeater and the other device is addressed to the own device or the other device, and the own device When it is addressed to the other device, it has a control processing for monitoring and control according to the information content, and when addressed to another device, it has an algorithm for transferring the maintenance and operation information to another device adjacent thereto. This allows
It is possible to reduce the number of individual maintenance operation communication channels conventionally provided between the maintenance operation device and each optical repeater.

Further, in the optical regenerative repeater, whether the maintenance operation information transferred via the communication channel provided with another device is a command from the multiplexing terminal device, It has an algorithm that determines whether it is a response and changes the information transfer method according to the determination result. As a result, even if there are a plurality of optical regenerators and optical linear repeaters, the maintenance operation communication channels between the multiplexing terminal equipment and each optical repeater can be integrated into one.

[0015]

【Example】

(First Embodiment) FIG. 4 shows the configuration of a first embodiment of the optical repeater monitoring system of the present invention. In the present embodiment, the optical repeater to be monitored is an optical regenerator, and the maintenance operation communication channel is D1, D2, D3 bytes in RSOH included in the STM frame in the SDH transmission system, and data is stored on the channel. It is assumed that the LAPD protocol is used for the layer 2 of the communication protocol as a means for establishing a link. Further, the information transfer method is such that the LAPD is terminated by using the uplink and the downlink between the adjacent devices, and whether the maintenance operation information is addressed to the own device or the other device is determined. Performs the monitoring control processing according to the information content, and when it is addressed to another device, transfers the maintenance and operation information to another adjacent device.

The multiplexing terminal device 11 is a maintenance / operation device 14
An information communication unit 21 for performing information communication processing with the optical repeater 12, a repeater remote monitoring control unit 22 for remotely monitoring the optical regenerator 12 located between the opposing multiplexing terminal devices, a LAP between adjacent devices.
LAPD unit 23 terminating D protocol, D in RSOH included in STM frame which is a main signal transmission frame
The STM frame transmitting unit 24 and the STM frame receiving unit 25 insert or separate maintenance operation information for remote monitoring control of the repeater into the 1, D2, D3 bytes.

The optical regenerator 12 is addressed to its own device or to another device based on the transfer information from the similar STM frame transmitter 31, STM frame receiver 32, LAPD 33, and LAPD 33. An information discriminating section 34 for discriminating
The monitoring control unit 35 monitors the relay section and controls the device. When information to be transmitted to the optical regeneration repeater 12 is generated in the maintenance operation device 14, the maintenance operation device 14 sends the information to the multiplexing terminal station device 11 to which the target optical regeneration repeater is connected. The multiplexing terminal device 11 includes an information communication unit 2
In step 1, the information is received, and since the information is the information to be transmitted to the optical regenerator 12, it is transmitted to the relay remote monitoring controller 22. The repeater remote monitoring controller 22 uses the maintenance operation communication channel to transmit the information to the optical regenerator 12. In order to transmit information, L of the multiplexing terminal device 11 is transmitted.
L of the APD unit 23 and the adjacent optical regenerator 12
The APD unit 33 uses D1, D2 and D3 in RSOH of the STM frame according to the protocol defined in LAPD.
Establish a data link on the byte. When the data link is established, the information from the maintenance operation device 14 is transferred from the multiplexing terminal equipment 11 to the adjacent optical regenerator 12 using the data link.

In the optical regenerator 12, the information discriminating section 34 discriminates whether or not the received information is addressed to itself. The information determination unit 34 notifies the monitoring control unit 35 when the information is addressed to itself. The monitoring control unit 35 performs monitoring control processing according to the information content and returns the response information to the maintenance operation device 14. The return is performed using the return data link in the same procedure as above. On the other hand, when it is addressed to another device, the information determination unit 34 transfers the information to the LAPD unit 33 that establishes a data link with the adjacent device. The transfer method to the adjacent device is performed using a predetermined data link as described above.

(Second Embodiment) FIG. 5 shows the configuration of a second embodiment of the optical repeater monitoring system of the present invention. In this example,
The procedure is the same as that of the first embodiment except the information transfer method in the optical regenerator. That is, in the optical regenerator 12, the LAPD 33 functions as the information discriminating unit 34. The information transfer method in the first embodiment is the LAPD
After the termination of the protocol, the information discriminating unit 34 determines whether the maintenance operation information is addressed to the own device or another device. That is, the discrimination process is performed in the layer 3 shown by the OSI model. The information transfer method according to the present embodiment performs the determination process on the LAPD protocol, that is, layer 2.

When information to be transmitted to the optical regeneration repeater 12 is generated in the maintenance operation device 14, the maintenance operation device 14 sends the information to the multiplexing terminal station device 11 to which the target optical regeneration repeater is connected. The multiplexing terminal device 11 includes an information communication unit 21.
Then, the information is received, and since the information is the information to be transmitted to the optical regenerator 12, it is transmitted to the remote monitor remote control unit 22. The repeater remote monitoring controller 22 uses the maintenance operation communication channel to transmit the information to the optical regenerator 12. LA of the multiplexing terminal equipment 11 for transmitting information
The PD unit 23 and the LAPD unit 33 of the optical regenerator 12, which is the target of transmission of the information, establishes a data link on the D1, D2, and D3 bytes in the RSOH of the STM frame by the protocol defined in LAPD. To do.
When the data link is established, the information from the maintenance and operation device 14 uses the data link to multiplex the terminal equipment 11
From the optical regenerator 12 to which the information is transmitted.

The information is received by the LAPD section 33 of the optical regenerator 12 which is the transmission target of the information. LA
The PD unit 33 notifies the monitor control unit 35 of the received information. The monitoring control unit 35 performs monitoring control processing according to the information content and returns the response information to the maintenance operation device 14. The return is performed using a predetermined data link as described above.

(Third Embodiment) FIG. 6 shows the configuration of a third embodiment of the optical repeater monitoring system of the present invention. In this example,
Instead of transferring the maintenance operation information using the LAPD protocol as in the first and second embodiments, the maintenance operation communication channel (D in RSOH) in the transmission frame is transferred.
1, D2, D3 bytes) are assigned bit by bit. The bit assign must be configured so that all the target optical repeaters can be remotely monitored and controlled.

The multiplexing terminal device 11 includes a maintenance operation device 14
An information communication unit 21 for performing an information communication process with an optical repeater 12, a repeater remote monitoring control unit 22 for remotely monitoring the optical regenerator 12 located between the opposing multiplexing terminal equipment, and an STM frame which is a main signal transmission frame. D1, D in RSOH included in
The STM frame transmitting unit 24 (STM frame receiving unit 25 in the opposite multiplexing terminal device 11) inserts maintenance operation information for remote monitoring control of the repeater into the 2, D3 bytes.

The optical regenerator 12 comprises a similar STM frame transmitter 31, an STM frame receiver 32, and a supervisory controller 35 for supervising and controlling the relay section. The monitoring control unit 35 fetches maintenance operation information, performs monitoring control processing according to the information content, and returns a response to ST.
The data is transferred to the multiplexing terminal device 11 via the M frame transmitter 31.

When information to be transmitted to the optical regeneration repeater 12 is generated in the maintenance operation device 14, the maintenance operation device 14 sends a command to the multiplexing terminal station device 11 to which the target optical regeneration repeater is connected. The multiplexing terminal apparatus 11 receives the command at the information communication unit 21, and since the command is a command to be transmitted to the optical regenerator 12, it transmits the command to the remote relay remote control unit 22. The repeater remote monitoring controller 22 uses the maintenance operation communication channel to transmit the command to the optical regenerator 12. In order to transmit this command, the multiplexing terminal device 11 has the RSOH of the STM frame.
Write the contents of the command onto the D1, D2, and D3 bytes of the above. At this time, the bit assignment predetermined by the content of the command is written.

In the optical regenerator 12, the received D1, D
Monitor and control unit 3 for the contents of bit assignment of 2, D3 bytes
Notify 5. The supervisory controller 35 performs supervisory control processing according to the contents of the command, and then sends a response to the maintenance operation device 14 as necessary to the opposing multiplexing terminal equipment 1
Return via 1 D1, D2, D3 for return
Writing on the byte is performed in the same manner as above.

(Fourth Embodiment) FIG. 7 shows the configuration of a fourth embodiment of the optical repeater monitoring system of the present invention. In this example,
Similar to the third embodiment, the maintenance operation communication channel (RSOH
(D1, D2, D3 bytes in the above) is a bit-by-bit assignment method. However, instead of using the multiplexing terminal equipments 11 at both ends, one of the multiplexing terminal equipments 11 is used.
Differs in that it constitutes an optical repeater monitoring system. That is, in the present embodiment, the uplink and downlink between the multiplexing terminal devices 11 are assigned as the command line and the response line, and the response to the command is returned to the command transmission source.

(Fifth Embodiment) FIG. 8 shows the configuration of a fifth embodiment of the optical repeater monitoring system of the present invention. In this example,
This is the same as the first embodiment except that the optical repeater to be monitored is the optical linear repeater 13. That is, the channel in the LSV is used as the communication channel for maintenance and operation, the LAPD protocol is used for the layer 2 and the discrimination processing protocol of the information transfer destination is used for the layer 3 as the communication protocol. Is a main signal channel, and is a maintenance operation communication channel for transferring maintenance operation information using a channel in the LSV.

Since the optical linear repeater 13 cannot process the maintenance operation communication channel in the transmission frame like the optical regenerative repeater 12, the multiplexing terminal station device 11 and the optical linear repeater 13 do not operate.
A channel in the LSV wavelength-multiplexed in the same optical fiber as that of the main signal transmission frame is used as a communication channel between and. Therefore, the multiplexing terminal device 11 transmits / receives the ST transmitting / receiving the STM frame which is the main signal transmission frame.
M frame transmitter 24 and STM frame receiver 25
In addition, an LSV signal transmitter 26 and an LSV signal receiver 27 that terminate the LSV channel are provided. The optical linear repeater 13 is similar to the LSV signal transmitter 36, LSV.
The signal reception unit 37, the LAPD unit 33, the information determination unit 34, and the monitoring control unit 35 are included.

(Sixth Embodiment) FIG. 9 shows the configuration of a sixth embodiment of the optical repeater monitoring system of the present invention. In this example,
It is the same as the second embodiment except that the optical repeater to be monitored is the optical linear repeater 13. That is, the channel in the LSV is used as the communication channel for maintenance and the LAPD protocol is used for the layer 2 as the communication protocol.

Multiplexing terminal device 11 and optical linear repeater 1
3 includes the LSV signal transmitters 26 and 36 for terminating the LSV channel and the LSV, as in the case of the fifth embodiment.
Signal receiving units 27 and 37 are provided. (Seventh Embodiment) FIG. 10 shows the configuration of a seventh embodiment of the optical repeater monitoring system of the present invention.

This embodiment is the same as the third embodiment except that the optical repeater to be monitored is the optical linear repeater 13. That is, a method of transferring information bit by bit by using a channel in the LSV as a maintenance operation communication channel is adopted. As in the case of the fifth embodiment, the multiplexing terminal equipment 11 and the optical linear repeater 13 are provided with LSV signal transmitters 26, 36 and LSV signal receivers 27, 37 for terminating the LSV channel.

(Eighth Embodiment) FIG. 11 shows the configuration of an eighth embodiment of the optical repeater monitoring system of the present invention. This embodiment is the same as the fourth embodiment except that the optical repeater to be monitored is the optical linear repeater 13. That is, a channel in the LSV is used as a maintenance operation communication channel, information is transferred bit by bit, and a response to the command is returned to the command transmission source.

Multiplexing terminal device 11 and optical linear repeater 1
3 includes the LSV signal transmitters 26 and 36 for terminating the LSV channel and the LSV, as in the case of the fifth embodiment.
Signal receiving units 27 and 37 are provided. Hereinafter, the optical regenerator 12 and the optical linear repeater 13 are provided between the multiplexing terminal equipment 11.
A case in which the two are mixed will be described with reference to FIGS. 12 and 13.

FIG. 12 shows an SDH including an optical linear repeater 13.
1 shows an example configuration of a transmission system. Optical linear repeater 13
Between the optical linear repeater 13 and the optical regenerative repeater 12, and between the optical linear repeater 13 and the multiplexing terminal equipment 11.
An LSV different from the line that transmits the frame is provided.
FIG. 13 shows the input / output states of the optical regenerator 12 and the optical linear repeater 13 in the optical repeater monitoring system of the present invention.

(1) shows how the optical regenerator 12 transmits the command received from the upstream RSOH to the downstream RSOH and LSV. (2) shows that the optical regenerator 12 does not transmit the command received from the upstream LSV to the downstream. (3) is an optical regenerator 12
In Fig. 4, a state in which the response received from the upstream RSOH is transmitted only to the downstream RSOH is shown.

(4) shows that the optical regenerator 12 transmits the response received from the upstream LSV only to the downstream RSOH. (5) shows how the optical linear repeater 13 transmits the command or response received from the upstream LSV to the downstream LSV. With the above configuration, it is possible to prevent the optical regenerator 12 from generating unnecessary information, and it is possible to transfer information (command or response) to the optical linear repeater 13.

[0038]

As described above, in the optical repeater monitoring system of the present invention, the maintenance and operation device remotely monitors the optical regenerator and the optical linear repeater via the multiplexing terminal equipment. Therefore, it is possible to reduce individual maintenance operation communication channels between the maintenance operation device and each optical repeater. Further, even when there are a plurality of optical regenerators and optical linear repeaters, the maintenance operation communication channels between the multiplexing terminal equipment and each optical repeater can be integrated into one. Thereby, an economical optical repeater monitoring system can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of an optical repeater monitoring system of the present invention.

FIG. 2 is a diagram for explaining an information branching / merging operation in the optical regenerator.

FIG. 3 is a diagram for explaining how a plurality of pieces of the same information are generated by branching / merging of information in an optical regenerator.

FIG. 4 is a block diagram showing a configuration of a first embodiment of an optical repeater monitoring system of the present invention.

FIG. 5 is a block diagram showing the configuration of a second embodiment of the optical repeater monitoring system of the present invention.

FIG. 6 is a block diagram showing the configuration of a third embodiment of the optical repeater monitoring system of the present invention.

FIG. 7 is a block diagram showing the configuration of a fourth embodiment of the optical repeater monitoring system of the present invention.

FIG. 8 is a block diagram showing the configuration of a fifth embodiment of the optical repeater monitoring system of the present invention.

FIG. 9 is a block diagram showing the configuration of a sixth embodiment of the optical repeater monitoring system of the present invention.

FIG. 10 is a block diagram showing the configuration of a seventh embodiment of the optical repeater monitoring system of the present invention.

FIG. 11 is a block diagram showing the configuration of an eighth embodiment of the optical repeater monitoring system of the present invention.

FIG. 12 is a block diagram showing an embodiment configuration of an SDH transmission system including an optical linear repeater 13.

FIG. 13 is a diagram showing input / output states of the optical regenerator 12 and the optical linear repeater 13 in the optical repeater monitoring system of the present invention.

FIG. 14 is a block diagram showing a configuration of a conventional optical transmission system.

FIG. 15 is a diagram showing the structure of an STM frame.

FIG. 16 is a block diagram showing a configuration of a conventional optical repeater monitoring system.

[Explanation of symbols]

11 Multiplexing terminal device 12 Optical regenerator 13 Optical linear repeater 14 Maintenance operation equipment 21 Information and Communication Department 22 Repeater remote monitoring controller 23 LAPD section 24 STM frame transmitter 25 STM frame receiver 26 LSV signal transmitter 27 LSV signal receiver 31 STM frame transmitter 32 STM frame receiver 33 LAPD section 34 Information Discrimination Section 35 Monitoring and Control Unit 36 LSV signal transmitter 37 LSV signal receiver

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Sato 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (56) Reference JP-A-5-292083 (JP, A) JP-A 6-260973 (JP, A) JP-A-5-308361 (JP, A) JP-A-6-205002 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 10/00 -10/28 H04J 14/00-14/08

Claims (3)

(57) [Claims] 1. An optical transmission system comprising an optical regenerator and an optical linear repeater arranged between multiplex terminal equipment, and an optical fiber connecting them, wherein the multiplex terminal equipment is a communication device. A communication function with a maintenance operation device for maintenance operation of a network or a transmission line network, a communication function for transmitting and receiving maintenance operation information using the optical regenerator and the main signal channel, an optical linear repeater and a monitoring line ( LS
V) has a communication function of transmitting and receiving maintenance and operation information using the channel in, and a function of monitoring the optical regenerator and the optical linear repeater from the maintenance and operation information, and the optical regenerator is connected. Having a function of monitoring a relay section including an optical fiber, and a communication function of transmitting and receiving maintenance operation information using a multiplexing signal terminal device or an optical regenerator and a main signal channel, the optical linear repeater, It has a function to monitor the relay section including the connected optical fiber, and a communication function to send and receive the maintenance operation information using the channel in the LSV with the multiplexing terminal equipment, the optical regenerator and the optical linear repeater. , ITU-T Recommendation G.264 as the main signal channel. 70
7, G.I. 708, G.I. 709-compliant synchronous transfer mode frame (STM frame) included in the regenerator section overhead (RSOH) D1, D2
The D3 byte is used, and a multiplexing terminal device is provided between the multiplexing terminal device and the optical regenerator.
Optical regenerator and optical regenerator
Between the optical regenerator and the optical linear repeater
The maintenance operation information is terminated by the optical regenerator and the optical regenerator is transferred via the communication channel.
Information is a command from the multiplexing terminal device
Or the response from the optical regenerator or optical linear repeater.
The main signal channel is the channel that transferred the information.
Or the channel within the LSV, and
As a result, if the main signal channel transfers the command,
Both the main signal channel and the channel in the LSV
Transfer and the channel in the LSV transfers the command
Stops transferring the command and the main signal channel is
If the response is transferred, the response is returned to the main signal channel.
Channel, and the channel in the LSV transfers the response.
If sent, transfer the response to the main signal channel
The maintenance operation device performs remote monitoring of the optical regenerator and the optical linear repeater arranged between the multiplexing terminal equipment via the multiplexing terminal equipment. An optical repeater monitoring system characterized by the above. 2. The optical repeater monitoring system according to claim 1, wherein ITU-T Recommendations Q.920 and Q.920, Q.920 are provided as communication means between the multiplexing terminal equipment and the optical regenerator or optical linear repeater. An optical repeater monitoring system having a configuration using the LAPD protocol according to 921. 3. The optical repeater monitoring system according to claim 1, wherein the optical regenerator and the optical linear repeater are the maintenance operation information transferred via the communication channel to their own devices or other devices. It has an algorithm to determine whether it is addressed to the device itself, and if it is addressed to the device itself, perform monitoring control processing according to the information content, and if it is addressed to another device, have an algorithm to transfer the maintenance operation information to another device adjacent Optical repeater monitoring system.