KR100247483B1 - Method for diagnosing automatically a functional failure in a network of optical transmission system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for automatically diagnosing malfunction in an optical transmission system network.

2. The technical problem to be solved by the invention

The present invention can automatically report to the uplink optical device the input signal loss (LOS) and multi-station power failure indication (MS-RDI) signals generated by blocking the light output of the light emitting device, compared with the results predicted in advance. The purpose of the present invention is to provide a method for automatically diagnosing functional disorders in an optical transmission system network capable of automatically diagnosing functional disorders of a network.

3. Summary of Solution to Invention

The present invention includes a first step of forcibly generating an input signal loss (LOS) alarm by automatically cutting off the light output of a light emitting element at a master region; A second step of storing, in the table of the master station, the contents of reports of the slave stations reported through the detected input signal loss alert and the fault indication signal; And a third step of automatically diagnosing a failure by comparing the information reported from each of the slave stations with a table predicted and stored in advance.

4. Important uses of the invention

The present invention is used for long distance optical transmission system.

Description

Automatic diagnosis of functional disorders in optical transmission system network

The present invention relates to a method for automatically diagnosing a functional disorder that can automatically diagnose a functional disorder in an optical transmission system network including an optical end station apparatus and an optical relay apparatus.

1 is a block diagram of a conventional optical transmission system network.

The conventional optical transmission system network is composed of an uplink optical station device 11, optical relay devices 12-1, 12-2, and a downlink optical station device 13.

The uplink optical station apparatus 11 includes a controller 111, a multiplex section overhead processor (MSHOP) 112, an optical transmitter 113, and an optical receiver 114.

The optical relay devices 12-1 and 12-2 include a controller 121 for detecting the LOS alarm and the optical path amplifier 122.

The downlink optical terminal device 13 includes a controller 121 for detecting an LOS alert, a multi-section overhead processor (MSHOP) 112, an optical transmitter 113, and an optical receiver 114.

The conventional method for diagnosing a malfunction in an optical transmission system network includes forcibly pulling an optical connector input to the optical path amplifier 122 of the optical relay devices 12-1 and 12-2 from an uplink optical station device 11 to perform optical The diagnosis was made by checking the LOS alarm generated by manually blocking the signal supply.

Therefore, the conventional method for diagnosing a malfunction of the optical transmission system network as described above has a cumbersome problem that an operator must visit and inspect the relay station directly.

The present invention has been made to solve the above problems, the input signal loss caused by blocking the light output of the light emitting device such as a laser diode (LD) of the optical transmitter in the optical relay device and the downlink optical terminal device ( Automatically diagnose LOS: Loss Of Signal (MS-RDI) and Multiplex Section Remote Defect Indicator (MS-RDI) signals to the uplink optical device to automatically diagnose network malfunctions compared with the predicted results. An object of the present invention is to provide a method for automatically diagnosing a malfunction in an optical transmission system network.

1 is a block diagram of a conventional optical transmission system network.

2 is a block diagram showing an example of an optical transmission system network to which the present invention is applied.

3 is a flowchart illustrating a method for automatically diagnosing a malfunction in an optical transmission system network according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: uplink optical station device

12: optical relay device

13: downlink optical station device

In order to achieve the above object, the present invention provides a method for diagnosing a malfunction in an optical transmission system network, the first step of forcibly generating an input signal loss (LOS) alarm by automatically blocking light output of a light emitting device at a master region. ; Giving a diagnostic command to slave stations via a communication channel, and storing the reports of each of the slave stations reported through the detected input signal loss alert and fault indication signal in a table of the master station; And a third step of automatically diagnosing a failure by comparing the information reported from each of the slave stations with a table predicted and stored in advance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating an example of an optical transmission system network to which the present invention is applied.

The optical transmission system network to which the present invention is applied is composed of an uplink optical station device 21, an optical relay device 22-1, 22-2, and a downlink optical station device 23.

The uplink optical station apparatus 21 includes a master controller 211, an optical transmitter 212, a multi-section overhead processor (MSHOP) 213, and an optical receiver 214 that issue diagnostic commands.

The optical relay devices 22-1 and 22-2 include a slave controller 221 and an optical fiber amplifier 222 that perform diagnostic commands.

The downlink optical station apparatus 23 includes a slave controller 231, an optical receiver 212, an optical transmitter 212, and a multi-section overhead processor (MSHOP) 213 that perform diagnostic commands.

The optical station equipment designed based on Synchronous Digital Hierarchy (SDH) or Synchronous Optical Network (SONET) can insert MS-RDI on the uplink when a segmentation failure such as LOS occurs on the downlink. The overhead bit is allocated.

Since the optical path amplifier 222 in the optical relay devices 12-1 and 12-2 is not a synchronous transmission device, a data communication channel (DCC) is not provided, so the uplink and downlink optical station devices 11 and 13 are not provided. ) And the optical fiber amplifier 122 requires a separate communication channel.

A data communication channel (DCC) exists between the master controller 211 that issues a diagnostic command and the slave controller 221 that performs a diagnostic command. Therefore, each slave controller 221 can report the LOS alarm detected by the optical path amplifier 222 to the master controller 211 through the DCC, and receives the command from the master controller 211, the LD employed as a light emitting element. Can cut off the light output.

A method of automatically diagnosing a malfunction in an optical transmission system network to which the present invention having the configuration described above is applied is as follows.

When the master controller 211 issues the LD optical output blocking command to the slave controller 221 using the data communication channel (DCC), the slave controller 221 blocks the LD optical output of the optical fiber amplifier 222 in response to the command. .

Therefore, due to the blocked optical signal, the supply of the optical signal to all the rear end regions is automatically cut off so that the LOS alarm is simultaneously generated, and the generated alarm is reported to the master controller 211 and the optical relay devices 22-1 and 22- are generated. The main signal for the alarm detection function, the LD blocking function, and the downlink optical link of 2) are transmitted.

In addition, the downlink optical station device 23 inserts an MS-RDI signal upward to the LOS alarm generated when the LD is blocked to diagnose whether the main signal is transmitted to the uplink.

3 is a flowchart illustrating a method for automatically diagnosing a malfunction in an optical transmission system network according to the present invention.

The slave controller 221 blocks the LD optical output employed as the light emitting element according to the command of the master controller 211 of the uplink optical station device 211 during the downlink diagnosis, and thus all the downstream optical relay devices 22-2 and the downlink. The LOS alarm of the optical station apparatus 23 is detected and the LOS alarm is reported to the master controller 211. In addition, the slave controller 231 of the downlink optical station device 23 inserts an MS-RDI signal into the LOS alert upward and transmits the MS-RDI signal to the master controller 211 of the uplink optical station device 21.

The master controller 211 detects the reported LOS alarm and MS-RDI signal and compares the result with a stored table prepared by predicting the result in advance (see Table 1) to diagnose LD block command execution, LOS alarm detection function, and the like. Determine the transmission status for the main signal.

As a result of the determination by the master controller 211, if the LD optical output is shut off but there is no reported LOS alarm and no MS-RDI signal is detected, the LD blocking command is considered not executed, and all LOS alarms are reported but MS-RDI is received. If no signal is detected, the uplink is considered a failure, and the main signal transmission for the downlink is considered normal. In addition, when only the MS-RDI signal is detected without receiving the LOS alarm, the LOS detection function failure and the downlink and uplink main signal transmission are considered normal.

As described above, the present invention compares the stored table (Table 1) with the actual detected faults to detect the uplink and downlink faults, control command execution, and normal transmission of the main signal. Do this.

First, the master controller 211 generates an LOS alarm by blocking the LD optical output of the uplink optical station device 21 (301), and then performs an MS-RDI from the downlink optical station device 23 through the optical receiver 214. It is determined whether a signal has been received (302).

If the MS-RDI signal is detected from the downlink optical station device 23, the LD blocking success and the MS-RDI signal detection success for the uplink optical station device 211 are stored in the table (303), and the LOS alarm is relayed optically. It is determined 304 whether it has been reported from the device 22 and the downlink optical station device 23.

On the other hand, if the MS-RDI signal is not detected from the downlink optical station device 23, it is determined whether the LOS alarm is reported from the optical relay device 22 or the downlink optical station device 23 without storing in the table (304).

As a result of the determination, if the LOS alarm is reported from the optical relay device 22 or the downlink optical station device 23, the LOS alarm detection success of the corresponding locality is stored in the table (305), and then the LD light output blocking command is released (306). Allow the light output to occur normally.

As a result of the determination, if the LOS alarm is not reported from either the optical relay device 22 or the downlink optical station device 23, the LD light output blocking command is released (306) so that the light output normally occurs.

Then, it is determined whether the downlink optical station apparatus 23 is 307.

If it is not the downlink optical station device 23, it is assumed that there is an optical relay device 22 to be diagnosed, and then moves to the next optical relay device 22 (308). 306 to 306 are repeatedly performed to sequentially block and restore the LD light outputs of all the optical relay devices 22.

Finally, the downlink optical station apparatus 23 compares the result with the table (Table 1) created by predicting the result in advance, and finds the local region which does not operate normally (309). That is, it diagnoses the malfunction of the optical link and the state of the main signal transmission.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

According to the present invention as described above, it is possible to automatically diagnose the malfunction caused during the operation of the system, there is an effect that can be quickly and conveniently handled during the maintenance of the optical link.

Claims (5)

In the functional failure diagnosis method in the optical transmission system network, A first step of forcibly generating an input signal loss (LOS) alarm by automatically cutting off the light output of the light emitting element at the master area; Giving a diagnostic command to slave stations via a communication channel, and storing the reports of each of the slave stations reported through the detected input signal loss alert and fault indication signal in a table of the master station; And A third step of automatically diagnosing a failure by comparing the information reported from each of the slave stations with a table predicted and stored in advance Automatic diagnosis of malfunction in the optical transmission system network comprising a. The method of claim 1, The second step, A fourth step of determining whether a fault indication signal inserted in a last slave local area of each slave local area is detected; A fifth step of storing a light output blocking success of the light emitting means and a successful detection of the fault indication signal in a table when a fault indication signal is detected; A sixth step of determining whether an input signal loss alert detected from each of the slave stations has been reported; A seventh step of storing an input signal alarm detection success in a table when an input signal loss alarm is reported; An eighth step of releasing the light emitting means light output blocking command if no information is reported from each of the slave localities; A ninth step of determining whether it is the last slave locality of each of the slave localities and moving to the next slave local if it is not the last slave local to block and restore the light output means of the light emitting means of all the slave localities in sequence; Automatic diagnosis of malfunction in the optical transmission system network comprising a. The method according to claim 1 or 2, The communication channel of the second stage, And a data communication channel (DCC) existing between the master local and the slave localities. The method of claim 3, wherein The second, fourth, and fifth step fault indication signals are respectively, Automated malfunction in the optical transmission system network, characterized in that it is a Multiplex Section Remote Defect Indicator (MS-RDI) signal inserted in the Loss Of Signal (LOS) alarm at the last slave locality. Diagnostic method. The method of claim 4, wherein Disability function diagnosis method using the table of the fourth step, If the laser diode (LD) light output is blocked but there is no reported input signal loss alarm and no MS-RDI signal is detected, it is determined that the laser diode (LD) blocking command has not been executed. If all of them are reported but the MS-RDI signal is not detected, it is considered as an uplink failure, the main signal transmission for the downlink is determined to be normal, and a multi-section is not received without receiving an input signal loss (LOS) alarm. If only a failure indication (MS-RDI) signal is detected, the automatic failure diagnosis method for the optical transmission system, characterized in that it determines the input signal loss (LOS) alarm detection failure and the downlink and uplink main signal transmission is normal.

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