JPS62260439A - Monitor system for optical transmission system - Google Patents

Abstract

PURPOSE:To investigate the states of all optical relays even if one circuit develops fault by connecting the monitor signal lines of current and standby optical relays in a relay station and executing the polling of the optical relays of both circuits through the use of either of them. CONSTITUTION:If the circuit on the lower side is troubled, a monitor signal 103 on the current circuit side is transmitted to the SV disk 35a of the optical relay 32a on the troubled circuit side through the monitor signal line 103', with specification through polling given to the relay on the troubled circuit side. After ALM information overlaps with the monitor signal 103 on the SV disk 35a, it is again returned to the relay 31a on the current circuit side through the monitor signal line 103', put together with the monitor signal 103 in an AND circuit 42 on the current circuit side and transmitted to the current circuit side. Thus the state of the relay on the troubled circuit side can be investigated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is particularly applicable to an optical transmission system in which a monitoring signal is transmitted using the same transmission path as the main signal and monitoring is performed by polling. This invention relates to a monitoring method when a one-to-one switching configuration is adopted.

〔overview〕

The present invention includes an optical repeater that can perform polling by transmitting a monitoring signal using the same transmission path as the main signal,
In a monitoring method for an optical transmission system that has a working/standby switching configuration, the monitoring signal lines of the working optical repeater and the standby optical repeater at a relay station are connected to each other, and for example, if there is a failure in the transmission line at the exit of the standby optical repeater, In this case, the status of the repeater on the failed line can also be investigated by polling from the working line and sending a monitoring signal to the backup optical repeater to the working line via the working optical repeater. It is.

[Conventional technology]

FIG. 3 is a block diagram showing the configuration of an example of a conventional optical transmission system. A W-side optical terminal station 1 and an E-side optical terminal station 2 are connected via a transmission line via a relay station 3. The W-side optical terminal station 1 includes a switching device fil, an optical terminal device W12.13, and a monitoring device 14, and the E-side optical terminal station 2 includes a switching device 21, an optical terminal device 22.2.
3, and the relay station 3 includes optical repeaters 31, 32. In this configuration, the data signal 101 from the W-side optical terminal station 11 is
After passing through the switching device 11, it is sent out from the optical terminal device 12 to both the working and protection lines. Conversely, as for the signal from the transmission line side, the switching device 11 selects the signal of one of the two lines.

Now, if the main connection to the W-side optical terminal station 1 of the relay station 3 is cut off at point A, the monitoring device 14 in the W-side optical terminal station 1 will:
It becomes impossible to poll all optical terminal stations on the E side from the relay station 3.

Next, according to FIG. 4, CMI (Cod
An example of the internal configuration of the optical repeaters 31 and 32 when using the e Mark Inversion code will be described. CMI
Using a code, the supervisory signal can be superimposed on the main signal using a code rule violation. Optical signal 1 from W side optical terminal station 1
After passing through the optical-to-electrical converter 33 and the CMI decoding converter 43, the signal 04 is separated into the supervisory signal 103 and sent to the 5Vi35. Data (No. 8 105 and clock signal 106
is sent as is to the next CMI code conversion unit 36. S
In the V board 35, when the own station is designated by polling, the ALM information of the own station is superimposed on the monitoring signal 103 and sent back to the W side optical terminal station 1 using the line on the E-W side. If the local station is not designated, the received signal is sent to the CMI code converter 36 in the same manner as the data signal 105. Therefore, if the transmission line is disconnected at point A, there is no return line for the supervisory signal 103 to the W-side optical terminal station 1.

[Problem that the invention seeks to solve]

In the conventional optical transmission line optical monitoring method described above, even if the repeater on the working line side and the repeater on the faulty line side are adjacent to each other,
On the faulty line side, there was a drawback that it was impossible to monitor relay stations beyond the point of fault.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical transmission system monitoring system that eliminates the above-mentioned drawbacks and allows all statuses of repeaters on the faulty line side to be investigated.

[Means for solving problems]

The present invention provides a monitoring method for an optical transmission system in which a monitoring signal is transmitted using the same transmission path as the main signal, includes an optical repeater including a polling response means, and has a working/standby switching configuration.
The monitoring signal lines of the working optical repeater and standby optical repeater of each relay station are connected to each other, and the above monitoring signal input to either one of the two optical repeaters is given to the other optical repeater, and the response is sent to the other optical repeater. The present invention is characterized in that a monitoring means for transmitting data from one of the optical repeaters to the line is provided.

[Effect]

The present invention connects the monitoring signal lines of a working repeater and a standby repeater in a relay station, and uses a transfer procedure to transmit, for example, a monitoring signal input to the working repeater from its S board to the SV board of the standby repeater. After inputting the signal and checking the status of the standby repeater, it is taken back into the working repeater and sent out to the working line.

Therefore, even if the backup transmission line is disconnected at the end of the backup repeater, when polling the backup repeater, a monitoring signal is sent via the working line and the working repeater.
The results can be sent back to the source together with the monitoring signal on the working line side, making it possible to investigate the status of all repeaters on the failed line side.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an optical transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing details of the configuration of an optical repeater.

In the optical transmission system of this embodiment, a W-side optical terminal station 1 and an E-side optical terminal station 2 are connected via a relay station 3a by two transmission lines, a working line and a backup line, respectively. The W-side optical terminal station 1 includes a switching device 11, an optical terminal device 12.13, and a monitoring device 14, and the E-side optical terminal station includes a switching device 21, an optical terminal device 22.23, and a relay station. 3a is the monitoring signal line 103'
It includes optical repeaters 31a and 32a connected to each other.

Further, the optical repeater 31a and the optical repeater 32a each include an optical-to-electrical converter 33.41 and a CMI decoding converter 34.
．． 40, SV135a, CM 1 code conversion unit 36
．． 39 electrical-optical converter 37, 38 and AND circuit 42
Contains. Note that the AND circuit 42 is omitted in the optical repeater 32a. This is shown in Fig. 2 by the optical repeater 31.
This is for the purpose of avoiding complexity by showing the case where the optical repeater 32a operates as a working repeater and the optical repeater 32a as a standby repeater.

The feature of the present invention is that, in FIGS. 1 and 2, a supervisory signal line 103' and an AND gate 42 are provided, and an SV board 35a having corresponding means is provided.

Next, the operation of this embodiment will be explained.

In this embodiment, the upper optical repeater 31a in FIG. 2 is on the working line side, and the lower optical repeater 32a is on the failed line side. If there is no abnormality on both lines, the supervisory signal 103 sent to the SV board 35a of the upper optical repeater 31a passes through the AND circuit 42 and is sent to the CMl on the E-W side if the local station is designated by polling. The signal is sent to the code conversion section 39. If a fault occurs in the lower line, if the repeater on the faulty line is specified by polling, the monitoring signal 103 on the working line will be transmitted from the SV panel 35a to the faulty line through the monitoring signal line 103'. ' is sent to the SV board 35a of the optical repeater 32a. And on that SV board 35a, A
After superimposing the LM information etc. on the monitoring signal 103, it is returned to the repeater 31a on the working line side through the monitoring signal line 103' again, and is combined with the monitoring signal 103 on the working line side by the AND circuit 42, and then sent to the working line side. is sent to the E-W line of

Note that even when the optical repeater 32a is on the working line side and the optical repeater 31a is on the faulty line side (however, in FIG. 2, the AND gate 42 is also added to the optical repeater 32a side), the same operation as above is performed. perform an action.

〔Effect of the invention〕

As explained above, the present invention connects the monitoring signal lines of both the active and standby optical repeaters at a relay station, and allows polling of the optical repeaters of both lines using either line. This has the advantage that even if one of the lines fails, the status of all optical repeaters can be investigated.

Therefore, according to the present invention, it is possible to obtain a monitoring method for an optical transmission system in which it is easy to search for the cause of a failure and the maintainability is improved, which is highly effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an optical transmission system according to an embodiment of the present invention. FIG. 2 is a block diagram showing details of the configuration of the optical repeater. FIG. 3 is a block diagram showing the configuration of a conventional optical transmission system. FIG. 4 is a block diagram showing details of the configuration of the optical repeater.

Claims (1)

[Claims] (1) The monitoring signal is transmitted using the same transmission path as the main signal, includes an optical repeater including polling response means, and is
In a monitoring method for an optical transmission system with a standby switching configuration, the monitoring signal lines of the working optical repeater and standby optical repeater of each relay station are connected to each other, and the above-mentioned monitoring signal that is input to either one of the two optical repeaters is 1. A monitoring system for an optical transmission system, comprising monitoring means for applying a signal to another optical repeater and transmitting a response from said one optical repeater to a line.