JP3435700B2 - Method of transmitting alarm and command in network using optical amplification repeater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting various alarms and commands in a network using an optical amplification repeater.

[0002]

2. Description of the Related Art Conventionally, supervisory control has been performed by using a management overhead provided in a main signal. For example, STM-1 (Synchronous Transfer Module level) shown in FIG.
(1: CCITT compliant) In the frame, B1 is used to monitor the transmission path error rate.
Bytes, D1-D3 bytes for data communication channel (DCC), and E1 byte for order wire. The supervisory control information is transmitted between the repeaters by using the plurality of management overheads, and each repeater performs processing.

[0003]

In the above-mentioned prior art, a management overhead is provided in the main signal, the reception is performed by a conventional repeater (3R repeater), the received optical signal is converted into an electric signal, and then the management is performed. The remote monitoring control was realized by processing the overhead for use. However, since the optical amplification repeater (1R repeater) directly amplifies the received optical signal without converting it into an electric signal, it is impossible to process the management overhead in the optical amplification repeater. Therefore, SDH (Synch) specified in CCITT Recommendation G.707-709
It is difficult to realize the management function (for example, AIS function, failure location notification function (function of F1 byte)) that the STM frame of hronous Digital Hierarchy) has.

Therefore, it is necessary to use some means to control the network using the optical amplification repeater to a high level in SDH.

[0005]

To solve the above problems, it is possible to monitor and control the optical amplification repeater by utilizing a monitor control signal that is wavelength-multiplexed with a main signal and transmitted. .

[0006]

The operation is shown in FIG. In FIG. 1, the terminal stations 1 and 5 are connected via a plurality of repeaters 2, 3, 4. The repeater is an optical amplification repeater (1R repeater).
The main signal proceeds in the network while being amplified by the fiber amplifier of the optical amplification repeater. The supervisory control signal is converted from an optical signal into an electric signal in each optical amplification repeater, processed, converted into an optical signal, and transmitted to the next-stage repeater.

Next, FIG. 2 shows the configuration of the optical amplification repeater. The optical amplification repeater receives the main signal and the supervisory control signal wavelength-multiplexed with the main signal. The signal on the transmission line is light. The received signal 12-1 is separated into a main signal 13-1 and a supervisory control signal 14-1 by the demultiplexer 2-1, and the main signal is amplified as it is by the amplifying unit 22-1. The monitor / control signal 13-1 is converted into an electric signal by the optical / electrical conversion unit 25-1. After that, the CMI frame synchronization unit 26-1
Frame synchronization is achieved by CMI code rule violation. Next, the supervisory control signal receiving unit 27-1 checks the destination display in the supervisory control signal to determine whether it is addressed to its own repeater. When it is addressed to the own repeater, the instruction described in the supervisory control signal is executed. When it is addressed to another repeater, it is sent to the supervisory control signal generator 29-1, stored in the transmission buffer in the supervisory control signal generator, and transmitted in order. Further, the input abnormality / in-apparatus abnormality detection unit 28-1 of the repeater
When a fault is detected by the monitor and an alarm is issued, the supervisory control signal generating unit 29-1 transmits a supervisory control signal in which fault information (type, ID of own repeater, etc.) is recorded.
2-3 orders. Receiving this, the supervisory control signal generator 29-1
Generates a supervisory control signal and stores it in the transmission buffer,
Send in order.

Further, the monitoring control unit makes the alarm issuing cycle equal to the monitoring cycle, and when a serious failure such as a main signal disconnection or an optical fiber disconnection is detected, a failure occurs at a cycle shorter than the monitoring cycle. The detected ID of the optical amplifier repeater is recorded in the supervisory control signal and transmitted.

Further, a region for an order wire is fixedly provided in the supervisory control signal. This allows maintenance personnel who are distant from different points to call, so that CCITT ST
The function of E1 byte of M frame can be realized.

Further, the DCC (Data Communicator) is included in the supervisory control signal.
area is fixedly provided. This enables remote control of the optical amplifier repeater, which is why CCIT
The functions of the D1-D3 bytes of the T STM frame can be realized.

Further, the power supply voltage level of the repeater is measured,
If you drop below a preset level,
A predetermined bit in the supervisory control signal is set to notify the subsequent stage of power interruption.

Further, an output stop command is issued to an arbitrary repeater according to the monitor control signal. As a result, the output can be stopped at the repeater that has received the output stop command.

Further, the output level change is transmitted to an arbitrary repeater by the monitoring control signal. Then, the output level is changed in the repeater which has received the output level change command. This makes it possible to deal with a change in the transmission rate of the main signal.

Further, the LD of the optical amplifying section is duplicated in advance, and if the LD in use fails, the reliability can be improved by instructing to switch to the other by the supervisory control signal.

By the above control, high level network management can be realized.

[0016]

EXAMPLE A first example of the present invention will be described with reference to FIG. FIG. 1 is a network for performing communication between terminal stations using an optical amplification repeater. Main signal (wavelength 1.55 μm)
Is generated at the terminal station 1 or 5, is optically amplified by the optical amplification repeater, and travels in the network. Here, in this network, the main signal is the supervisory control signal (wavelength 1.48 μm)
Are wavelength-multiplexed and transmitted.

Next, FIG. 2 shows the configuration of the optical amplification repeater. The optical amplification repeater receives the main signal and the supervisory control signal wavelength-multiplexed with the main signal. The signal on the transmission line is light. The received signal 12-1 is separated into a main signal 13-1 and a supervisory control signal 14-1 by the demultiplexer 2-1, and the main signal is amplified as it is by the amplifying unit 22-1. The monitor / control signal 13-1 is converted into an electric signal by the optical / electrical conversion unit 25-1. After that, the CMI frame synchronization unit 26-1
Frame synchronization is achieved by CMI code rule violation. Next, the supervisory control signal receiving unit 27-1 checks the destination display in the supervisory control signal to determine whether it is addressed to its own repeater. When it is addressed to the own repeater, the instruction described in the supervisory control signal is executed. When it is addressed to another repeater, it is sent to the supervisory control signal generator 29-1, stored in the transmission buffer in the supervisory control signal generator, and transmitted in order. The electro-optical converter 30-1 converts this into an optical signal, and
At 33-1, it is multiplexed with the output (main signal) of the optical amplification section 22-1. Also,
When the input abnormality / in-apparatus abnormality detection unit 28-1 of the repeater detects a failure and issues an alarm, the monitoring control signal generation unit 29-1
In step 3, the monitoring control unit 2-3 commands the transmission of a monitoring control signal in which failure information (type, ID of own repeater, etc.) is written. Receiving this, the monitor control signal generation unit 29-1 generates a monitor control signal, stores it in the transmission buffer, and transmits it in order.

Here, the frame structure of the supervisory control signal is shown in FIG.
Shown in. The supervisory control signal shown in FIG. 3 has a frame length of 48 bytes and a transmission rate of 384 kbit / s. Frame period is 1
It will be a millisecond. In the frame, receiver device ID, sender device ID, alarm information area, FCS (Frame Check Sequence) area, optical amplification repeater section AIS (Alarm Indication Sign)
al) area, order wire area, and DCC area. Where the orderwire area is 8 bytes, so 64k
It has a b / s transmission rate. Also, the DCC area is 24 bytes, and thus has a transmission rate of 192 kb / s. Further, the supervisory control signal is transmitted by a CMI (Coded Mark Inversion) code. Therefore, CMI code rule violation enables frame synchronization.

Next, details of the alarm information area of the monitor control signal will be described with reference to FIG. The first byte of the alarm information area is used to transfer the monitoring information of the main signal system. In order from the first bit, the contents are optical fiber disconnection, loss of frame synchronization of supervisory control signal, error occurrence due to FCS inspection of supervisory control signal, main signal input disconnection, supervisory control signal input disconnection. Here, the optical fiber break indicates that neither the main signal nor the supervisory control signal is input. The main signal input disconnection indicates that the supervisory control signal is correctly received but the main signal is no longer input. Further, the disconnection of the supervisory control signal indicates that the main signal is correctly received but the supervisory control signal is no longer input. The second and subsequent bytes indicate the occurrence of device failure. The third byte sets bit1 to "1" when a failure of the optical amplifier is detected, and bit2-
Parts of the signal processing unit that has failed are shown using 8 bits. This can be easily realized by assigning an ID to each component in advance. The 4th byte is empty.

Returning to FIG. 3, assuming that the monitoring cycle is 1 second, the frame cycle is 1 millisecond. Therefore, if the number of repeaters is about 100, the monitoring control signal should be used by all the repeaters. Is possible.

In FIG. 1, the supervisory control signal is transmitted from the terminal station 1 to the transmission line 10 and from the terminal station 2 to the transmission line 11.

Each repeater always receives the above-mentioned supervisory control signal. And the destination device in the supervisory control frame
Looking at the ID, if it is addressed to itself, the reception monitoring control signal is taken in, and the command written in the monitoring control signal is executed. If it is not addressed to itself, it is sent to the supervisory control signal generation unit, temporarily stored in the transmission buffer in the supervisory control signal generation unit, and output after waiting for the turn.

Further, each repeater always transmits the supervisory control signal frame described above. Then, when reporting the alarm and the internal state, the supervisory control unit 2-3 uses the supervisory control signal generation unit 29-
1 to the destination device ID, the end station ID, the source device I
Enter the ID assigned to you in D. Further, among the bits shown in the alarm information area of the supervisory control signal shown in FIG. 4, the bit of the corresponding portion is set to 1 and the other portions are set to 0 to temporarily store in the transmission buffer, wait for the turn and transmit.

Alternatively, the monitor control unit 2-3 can instruct the monitor control signal generation unit 29-2 to output the monitor control signal to the WEST side. As a result, EAST receives instructions,
It is also possible to output a supervisory control signal to the WEST side.

Next, when the repeater detects an important fault such as a main signal input interruption, the section AIS (Alar) in FIG.
Enter the ID of the detected repeater in the m Indication Signal area and send. This allows the F of the CCITT STM frame to be
Realizes a 1-byte function. That is, the ID of the failure detection repeater is transmitted to the subsequent stage.

Next, the main signal return control will be described.
The terminal station 1 transmits a main signal loopback command to any repeater using the DCC area in the supervisory control signal. In FIG. 2, the monitor control unit 2-3 that has received the loopback command is the switch 2
Main signal from EAST to WEST by controlling 3-1 and 23-2
Wrap around (or vice versa). For example, when returning from EAST to WEST, the output of the optical amplification section 22-1 is changed from SW23-1 to 23-2.
It is turned back by transmitting to (signal line 17 in FIG. 2).

Next, changing the output level will be described. Terminal
From 1 the main signal output level change command is transmitted to any repeater using the DCC area in the monitor control signal, and the monitor control unit 2-3 which received the command instructs the optical amplification unit 22-1 to output Change the level.

Next, the processing in the 3R repeater 3 having the function of converting the main signal from light to electricity, processing it, and then converting it to light and transmitting it will be described. The configuration of the 3R repeater is shown in FIG. In the 3R repeater shown in FIG. 5, in addition to the function relating to the supervisory control signal processing of the optical amplification repeater described above,
After converting the main signal from light to electricity in the electric converter 31-1, in the main signal processing unit 32-1, frame synchronization is taken,
Descramble and handle section overhead. After processing, scramble the main signal,
The electric / optical converter 33-1 converts the light into light and outputs the light. FIG. 6 shows the frame structure of the main signal used in this embodiment. The main signal shown in FIG. 6 is an STM-1 frame defined in CCITT Recommendation G.707,708,709.

When the supervisory control signal is received by the 3R repeater 3 and an alarm notification is detected in the supervisory control signal,
Performs processing on the main signal and applies the CCITT Recommendation G.707,708,7
According to the method specified in 09, AIS (Alarm Indication Signal)
Is generated and the alarm is notified to the latter stage.

Further, using the DCC area in the supervisory control signal, B1 error rate deterioration detection threshold value, B2 error rate deterioration detection threshold value, alarm detection prohibition, Section-FERF detection prohibition, Section
-It is also possible to easily transmit SDH-related soft strap instructions such as FEBE detection prohibition and Path-AIS detection prohibition.

Next, the processing at the terminal station will be described. The configuration of the terminal station 5 is shown in FIG. On the EAST side of the terminal station 5 shown in FIG. 7,
In addition to the function related to the supervisory control signal processing of the optical amplification repeater described above, the optical / electrical conversion circuit 31-1 converts the main signal from light to electricity, and the main signal processing unit 33-1 performs frame synchronization. Then, descrambling is performed and section overhead processing and path overhead processing are performed. After processing, scramble the main signal and
The light conversion circuit 33-1 converts the light into light and outputs the light.

On the WEST side, the main signal is converted from light to electricity by the optical / electrical conversion circuit 31-2 and processed by the main signal processing unit 34-2, and then the optical signal is converted by the electro-optical conversion circuit 33-2. , And the multiplexer 24-2 wavelength multiplexes the supervisory control signal and the main signal.

The monitor controller 5-3 comprises a monitor control interface 35 and a monitor control circuit 36. The monitor control interface 35 corresponds to access from the outside.

At the terminal station 1, the processing on the EAST side and the processing on the WEST side are reversed.

The terminal station receives the supervisory control signal, and
When an alarm notification is detected in the supervisory control signal, the main signal is processed, and by the method defined in the CCITT Recommendation G.707,708,709, AIS (Alarm Indication Signal) is generated,
The alarm is notified to the latter stage.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 1 is a network for performing communication between terminal stations using an optical amplification repeater. The main signal (wavelength 1.55 μm) is generated at the terminal and is optically amplified by the optical amplification repeater,
Go through the network.

In this network, the supervisory control signal (wavelength 1.48 μm) is wavelength-multiplexed with the main signal and transmitted.

The supervisory control signal is sent from the terminal station 1 to the transmission line 10,
It is transmitted from the terminal station 5 using the transmission line 11.

Next, FIG. 2 shows the configuration of the optical amplification repeater. The optical amplification repeater receives the main signal and the supervisory control signal wavelength-multiplexed with the main signal. The signal on the transmission line is light. The received signal 12-1 is separated into a main signal 13-1 and a supervisory control signal 14-1 by the demultiplexer 2-1, and the main signal is amplified as it is by the amplifying unit 22-1. The monitor / control signal 13-1 is converted into an electric signal by the optical / electrical conversion unit 25-1. After that, the CMI frame synchronization unit 26-1
Frame synchronization is achieved by CMI code rule violation. Next, the supervisory control signal receiving unit 27-1 checks the destination display in the supervisory control signal to determine whether it is addressed to its own repeater. When it is addressed to the own repeater, the instruction described in the supervisory control signal is executed. When it is addressed to another repeater, it is sent to the supervisory control signal generator 29-1, stored in the transmission buffer in the supervisory control signal generator, and transmitted in order. The electro-optical converter 30-1 converts this into an optical signal, and
At 33-1, it is multiplexed with the output (main signal) of the optical amplification section 22-1. Also,
When the input abnormality / in-apparatus abnormality detection unit 28-1 of the repeater detects a failure and issues an alarm, the monitoring control signal generation unit 29-1
In step 3, the monitoring control unit 2-3 commands the transmission of a monitoring control signal in which failure information (type, ID of own repeater, etc.) is written. Receiving this, the monitor control signal generation unit 29-1 generates a monitor control signal, stores it in the transmission buffer, and transmits it in order.

Here, the frame structure of the supervisory control signal is shown in FIG.
Shown in. The supervisory control signal shown in FIG. 8 has a frame length of 256 bytes and a transmission rate of 128 kbit / s. The frame period is 16 milliseconds. In the frame, an information area of 16 bytes is assigned to each repeater. Further, this area is divided into 8 bytes for EAST access and 8 bytes for WEST access, and access from both EAST and WEST can be executed. Also, the monitoring control signal is CM
It is transmitted by I (Coded Mark Inversion) code. Therefore, frame synchronization is achieved by CMI code rule violation. Next, details of the monitor control information area of the monitor control signal will be described with reference to FIG. The first byte of the supervisory control information information area is used for transmitting supervisory information of the main signal system. In order from the first bit, the contents are optical fiber disconnection, loss of frame synchronization of supervisory control signal, error occurrence due to FCS inspection of supervisory control signal, main signal input disconnection, supervisory control signal input disconnection.
Here, the optical fiber break indicates that neither the main signal nor the supervisory control signal is input. The main signal input disconnection indicates that the supervisory control signal is correctly received but the main signal is no longer input. Further, the disconnection of the supervisory control signal indicates that the main signal is correctly received but the supervisory control signal is no longer input. The 2nd and 3rd bytes indicate the occurrence of a device failure. The third byte indicates the component of the signal processing unit that has failed by using bit 7 as bits 2 to 8 when bit 1 is set to "1" when a failure in the optical amplification unit is detected. This can be easily realized by assigning an ID to each component in advance. The 4th byte is empty. The fifth and subsequent bytes are instructions. The fifth byte is the main signal loopback / cancellation instruction, the sixth byte is the output level setting command, and bits 1 to 4 are the types of the main signal transmitted on transmission lines 10 and 11 [STM-1 (about 150Mb / s), STM-4 (about 6
00Mb / s), STM-16 (approx. 2.4Gb / s), STM-64 (approx. 10Gb / s)] to change the output level. The 7th byte is an instruction for duplicating the mechanism of the optical amplification unit in advance and forcibly switching to the other when one fails. The 8th byte is an instruction for forcibly stopping the output of the optical amplification section.

In FIG. 1, the supervisory control signal is transmitted from the terminal station 1 to the transmission line 10 and from the terminal station 2 to the transmission line 11.

Each repeater always receives the above-mentioned supervisory control signal. Then, it executes the command described in its own supervisory control information area in the supervisory control frame.

Further, each repeater always transmits the above-mentioned supervisory control signal frame. When reporting the alarm and the internal state, the supervisory control unit 2-3 of FIG. 2 issues an instruction to the supervisory control signal generation unit 29-1, and further the bits shown in the supervisory control information area of the supervisory control signal shown in FIG. Of these, set the bit at the corresponding part to 1, and set the other parts to 0 to temporarily store in the transmission buffer, wait for the turn, and transmit. Then, it executes the command described in its own supervisory control information area in the supervisory control frame.

Next, the main signal return control will be described.
An arbitrary repeater is selected by the supervisory control signal from the terminal station and a main signal return instruction is transmitted by setting a predetermined bit in the supervisory control signal to 1, and a return test is performed.

Next, changing the output level will be described. An arbitrary repeater is selected by the supervisory control signal from the terminal station, and by setting a predetermined bit in the supervisory control signal to 1, an output level change command for main signal output is transmitted, and the optical amplification which received the command. Change the output level on the repeater.

Next, the output stop instruction will be described. The main signal output stop command is transmitted by selecting an arbitrary repeater from the terminal station by the monitor control signal and setting a predetermined bit in the monitor control signal to 1 and output by the optical amplification repeater receiving the command. To stop.

Next, the processing in the 3R repeater 3 having the function of converting the main signal from light to electricity, processing it, and then converting it to light and transmitting it will be described. The configuration of the 3R repeater is shown in FIG. In the 3R repeater shown in FIG. 5, in addition to the function relating to the supervisory control signal processing of the optical amplification repeater described above,
After converting the main signal from light to electricity in the electric converter 31-1, in the main signal processing unit 32-1, frame synchronization is taken,
Descramble and handle section overhead. After processing, scramble the main signal,
The electric / optical converter 33-1 converts the light into light and outputs the light. FIG. 6 shows the frame structure of the main signal used in this embodiment. The main signal shown in FIG. 6 is an STM-1 frame defined in CCITT Recommendation G.707,708,709.

When the supervisory control signal is received by the 3R repeater 3 and an alarm notification is detected in the supervisory control signal,
Performs processing on the main signal and applies the CCITT Recommendation G.707,708,7
According to the method specified in 09, AIS (Alarm Indication Signal)
Is generated and the alarm is notified to the latter stage.

Next, the processing at the terminal station will be described. The configuration of the terminal station 5 is shown in FIG. On the EAST side of the terminal station 5 shown in FIG. 7,
In addition to the function related to the supervisory control signal processing of the optical amplification repeater described above, the optical / electrical conversion circuit 31-1 converts the main signal from light to electricity, and the main signal processing unit 33-1 performs frame synchronization. Then, descrambling is performed and section overhead processing and path overhead processing are performed. After processing, scramble the main signal and
The light conversion circuit 33-1 converts the light into light and outputs the light.

On the WEST side, the main signal is converted from light to electricity by the optical / electrical conversion circuit 31-2 and processed by the main signal processing unit 34-2, and then the optical signal is converted by the electro-optical conversion circuit 33-2. , And the multiplexer 24-2 wavelength multiplexes the supervisory control signal and the main signal.

The supervisory controller 5-3 comprises a supervisory control interface 35 and a supervisory control circuit 36. The monitor control interface 35 corresponds to access from the outside.

At the terminal station 1, the processing on the EAST side and the processing on the WEST side are reversed.

The terminal station receives the supervisory control signal, and
When an alarm notification is detected in the supervisory control signal, the main signal is processed, and by the method defined in the CCITT Recommendation G.707,708,709, AIS (Alarm Indication Signal) is generated,
The alarm is notified to the latter stage.

[0054]

According to the present invention, it is possible to monitor and control the optical amplification repeater.

[Brief description of drawings]

FIG. 1 is a diagram showing a network configuration.

FIG. 2 is a diagram showing a configuration of an optical amplification repeater.

FIG. 3 is a diagram showing a frame structure of a supervisory control signal handled in the first embodiment.

FIG. 4 is a diagram showing details of an alarm information area in FIG.

FIG. 5 is a diagram showing a configuration of a 3R repeater.

FIG. 6 is a diagram showing the structure of an STM-1 frame defined in CCITT Recommendation G.707,708,709.

FIG. 7 is a diagram showing a configuration of a terminal station.

FIG. 8 is a diagram showing a frame structure of a supervisory control signal handled in the second embodiment.

9 is a diagram showing details of an alarm information area in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 terminal station, 2 optical amplification repeater, 3 3R repeater, 4 optical amplification repeater, 5 terminal station, 1-1 EAST side signal processing section 1-2 of terminal station 1 WEST side signal processing section 1 of terminal station 1 -3 Monitoring and Control Unit 2-1 of Terminal Station 2-1 EAST-Side Signal Processing Section 2 of Optical Amplification Repeater 2-2 WEST-Side Signal Processing Section of Optical Amplification Repeater 2 Terminal Station 2-3 Optical Amplification Repeater 2 Terminal Station 1 monitoring control section 3-1 3R repeater 3 EAST side signal processing section 3-2 3R repeater 3 WEST side signal processing section 3-3 3R repeater 3 monitoring control section 4-1 Optical amplification repeater 4 EAST-side signal processing unit 4-2 WEST-side signal processing unit 4-3 of optical amplification repeater 4 Supervisory control unit 5-1 of optical amplification repeater 4 EAST-side signal processing unit 5-2 of terminal station 5 Terminal station 5 WEST-side signal processing unit 5-3 Supervisory control unit 10 of terminal station 5 Transmission line, 11 Transmission line 12-1 Main signal and supervisory control signal Input 12-2 main signal to the EAST side and the input 13-1 EAST side main signal input to the WEST side of the monitor control signal, 13-2 WEST
Side main signal input 14-1 EAST side monitoring control signal input 14-2 WEST side monitoring control signal input 15-1 EAST side main signal output, 15-2 WEST
Side main signal output 16 main signal, 17 main signal 21-1 and 21-2 demultiplexer 22-1 and 22-2 optical amplifier 23-1 and 23-2 switch (SW) 24-1 and 24-2 combination Wave devices 25-1 and 25-2 Optical / electrical converters 26-1 and 26-2 CMI frame synchronization units 27-1 and 27-2 Supervisory control signal reception units 28-1 and 28-2 Input error / in-device error Detectors 29-1 and 29-2 Supervisory control signal generators 30-1 and 30-2 Electric / optical converters 31-1 and 31-2 Optical / electrical converters 32-1 and 32-2 Main signal processing unit 33 -1 and 33-2 Electric / Optical converters 34-1 and 34-2 Main signal processing unit 35 Supervisory control interface 36 Supervisory control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H04B 17/02 H04L 12/26 (56) Reference JP-A-3-104334 (JP, A) JP-A-3-236649 (JP , A) JP 63-144635 (JP, A) JP 60-177758 (JP, A) JP 60-241349 (JP, A) JP 59-5754 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 12/24 H04B 10/08

Claims (5)

(57) [Claims] Claim: What is claimed is:
(1) A method of transmitting an alarm and a command in a network for transmitting and receiving an optical signal, wherein the alarm and the command are an alarm generated in any of the plurality of optical amplification repeaters or a terminal station, and information on a location where the alarm is generated, and A second optical signal having a wavelength different from that of the first optical signal including a command for controlling either the plurality of optical amplification repeaters or the terminal station and destination information of the command, and the plurality of optical amplification repeaters. Each of the first optical signal and the second optical signal when receiving the optical signal wavelength-multiplexed,
The second optical signal is separated and converted into an electric signal, and if the command is directed to another optical amplification repeater, the command is relayed to execute control corresponding to the reception alarm, and the command is automatically transmitted. If the command is directed to the optical amplification repeater, the control corresponding to the command and the reception alarm is executed, and if a failure of the own device is detected, an alarm and information on the location where the alarm is generated are added to the electric signal, A method of transmitting an alarm and a command in a network using an optical amplification repeater, which comprises converting a signal into the second optical signal and transmitting the wavelength-multiplexed optical signal as the first optical signal. 2. Each of the optical amplification relay records comprises the second
2. The optical amplifying repeater according to claim 1, wherein another command and destination information of the other command are generated based on a command included in the optical signal or a fault of the own device to change the electric signal. A method for transmitting alarms and commands in a network using a network. 3. The first signal output from an optical amplification repeater designated by a command included in the second optical signal and destination information of the command.
3. The method of transmitting an alarm and a command in a network using the optical amplification repeater according to claim 1, wherein the output level of the optical signal is changed. 4. The first optical signal folding function is provided in any of the optical amplification repeaters, and any optical amplification repeater or terminal station returns the optical signal to the optical amplification repeater with the second optical signal. A method of transmitting an alarm and a command in a network using an optical amplification repeater according to any one of claims 1 to 3, wherein a command is transmitted and a first optical signal of the network is tested. 5. An optical amplifier for amplifying the first optical signal of the optical amplifying repeater has a redundant configuration, and if any one of the amplifiers fails, the second optical signal is used for another optical amplifying repeater. In the network using the optical amplification repeater according to any one of claims 1 to 4, characterized in that the first optical signal switching command is transmitted to the first optical signal repeater and the first optical signal of the network is transmitted. Alarm and command transmission method.