Analysis and elimination of Huawei SDH transmission equipment failure

Equipment failure phenomenon Huawei WDM

The common fault phenomena:

1.The circuit resistance

2.The part of 2M circuit interruption

3.The 2M circuit has error, exchange business interruptions, transmission equipment withoutwarning.

Cause analysis and treatment method.

1 first kind of phenomenon, should first check whether AB two standing plate are alarm, such as is it is very likely that the cable fault or receiving light power is too low, because thepossibility of two pieces of plate also bad not only receives the light plate, and a problem before the alarm. If only B station board alarm, you should test B station receives light, if the light is good, then the B station has fault, plate must be replaced, if the B station receives light is not good, then measuring station A light, such as light, then No. 1 fiber has a problem,or A station board failure.

2 second kind of phenomenon, should be the first to exchange side back, such as good, canwatch do back testing or in management from the B station inside the back positioning faultsection.

3 third phenomena, failure may have 3 kinds, one is the 2M cable contact is not good, two is DDF bad ground, three is the board received optical power is low (this will cause a large areacircuits have error or fault).

The Huawei transmission device, there are one three. To illustrate what I just use the network structure is the most simple description of the method and steps of processing faultabout daily maintenance, here is our most commonly used chain net structure to further elaborate.

Failure phenomenon

A station and D station of 2M business interruption.

The processing steps

A: put a 2M error code table in A, monitoring of A station and D station of 2M business. At this time, the error table indicating business interruption;

Two: through the network to the branch board D station software loop back. If the instrument display normal business, then there is the issue of D station, enter the third step. If theinstrument display business interruption, the transmission device has a problem, enter the fourth step.

The third step: in the DDF frame in the D station, then a transmission device hardware loopback, if the instrument is still displayed normal business, the transmission equipment is no problem. Need to consider a switch or relay cable problem.

The fourth step: the A station west to circuit boards, B circuit board, C station east stationeast to the circuit board as the inner loop back. If the business is in which station, the station fault or a station on the circuit board fault. Of course, if the ring back to the A station businessimpassability, then the fault point in the A station; if the ring back to the C station business,then may be D station, also may be the east station C to the circuit board has a problem.

The following C station further processing loop is as an example to explain the fault.

If the ring back to the B station west to the circuit board business, loop back to C station west to circuit board business impassability, may be C station malfunction or B station east to thecircuit board fault. Need to replace the circuit board.

The fifth step: arrive at B station, east to the circuit board by pigtail loop back, if A standingwatch test operations, the B station east to the circuit board is no problem, the point of failurein C stations or cable. Remove cable problem into sixth steps; if the ring back after businessis illogical, the board is faulty. By replacing the board, excluding the fault, if the fault is eliminated, the business back to normal, then the fault treatment completion. Otherwise,continue to the next step processing.

The sixth step: arrive at C station, one by one to replace C Station East, West to the circuit board and cross board, and troubleshootin       g. (if A station and C station service did not, then C station may also be fault clock board)

In fact, our actual maintenance process there are many situation will cause the circuit interruption, such as: power failure, power or low voltage power supply off equipment;maintenance personnel misoperation, modify or delete data, set the light path or branchexchange etc.. This requires us to constantly learning, accumulate experience, improve maintenance level, Huawei Transmission Card to ensure the network security, and stable operation.

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