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How to do Loopback when Troubleshoot Huawei OptiX OSN 2500?

MIBS, SMMPv1, SMMPv2, SMMPv3 and management

How to do Loopback when Troubleshoot Huawei OptiX OSN 2500?

Postby hone » Thu Mar 16, 2017 5:50 pm

Loopback is the most popular and effective method to locate faults in Huawei OptiX series equipment.

The most significant feature of this method is that there is no need of thorough data and
performance analysis. Hence, the equipment maintenance personnel are expected to be familiar
with this method.

Software Loopback Provided by the Huawei OptiX Series Equipment
By performing a loopback operations on the tributary board and the line board, you can locate
a fault to a specific NE and can check whether the board is faulty. This method is widely applied.
The maintenance personnel are required to master it.
You can perform a loopback on the cross-connect and timing board to check whether the board
fault occurs on the line side, tributary side, or in the cross-connection, and then to locate the fault
to the line board on one side. The loopback operations on the cross-connect and timing board
are complex, and thus are used in few cases.
Application
Before carrying out a loopback operation, determine the path and timeslot, the loopback position,
and the type of loopback to be used (inloop or outloop).\
Procedure
Step 1 By means of consultation, observation and test, select a faulty service channel on which the
loopback will be performed. Use the following simplified procedure to sample a service channel
for the loopback:
Select a faulty NE.
At the NE, select a faulty service channel.
NOTE
Since self-loop of the first VC-4 may affect the ECC communication, do not select the first VC-4 for
loopback.
Analyze the service in one direction of the selected service channel.
Step 2 Draw the path diagram of the selected service in one direction. Mark the source and sink of the
service, the NEs through which the service passes, and the VC-4 path and the timeslot the service
occupies.
Step 3 Perform loopback section by section and station by station according to the service trail until
the faulty NE is located.
Step 4 After locating the faulty NE, further locate the possible faulty board by looping back the line,
tributary or cross-connect boards like Huawei GXCSA. Confirm the faulty board by applying other test methods. Finally, replace the faulty board.
Summary
You can perform loopback to quickly locate a fault to a station or even to a board without
spending excessive time on analyzing the alarm or performance events. The operations are
simple and can be easily mastered by the maintenance personnel.
If any other services are normal in the loopback path, however, the loopback method may cause
transient service interruption. Thus, you can adopt the loopback method to handle
hone
Cisco Catalyst 4500
 
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Joined: Thu Jan 07, 2016 1:03 am

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