Configuration Data Analysis
Analyzing the configuration data is a method used to determine and locate faults.
Overview
Sudden change in ambient conditions or improper operations may change or damage the
configuration data, for example, NE and board data of the equipment.
This can affect the service. In this case, after locating the fault at a single NE, further analyze
the configuration data to locate the fault.
Application
Locate the fault by querying and analyzing the current configuration data of the equipment.
The configuration data includes the following items:
Node parameters of the multiplex section
Path loopback setting for the line and tributary boards
Tributary path protection attributes
Path trace byte
For example, if the SNCP protection of a certain tributary board does not work, query whether
the path attribute of the tributary board is set to "protection".
You can view the operation log on the NM to check whether any improper operation on the NM
is performed.
Summary
This method is applicable to further analysis of a known faulty NE and helps to find the root
cause of a fault. This method, however, takes a long time and requires expertise in the field of
optical transmission and essential product knowledge.
Configuration Modification
Configuration modification is a method used to determine and locate faults.
Overview
Use this method to modify the timeslot configuration, slot configuration, and board parameter
configuration. This method also removes problems caused by configuration errors in a known
faulty NE.
In addition, this method is used to troubleshoot pointer justifications.
Application
If some path of a tributary board or some tributary board is suspected to be faulty, modify the
timeslot configuration to shift the payload to other path or tributary board.
If a certain slot is suspected to be faulty, change the slot configuration.
If a VC-4 is suspected to be faulty, shift the traffic to another VC-4.
During the upgrade or expansion, if you are unsure about the new configuration, you can re-load
the original configuration for confirmation.
Modifying the timeslot configuration, however, does not help to locate the faulty point or faulty
board, for example, a line board, tributary board, cross-connect board or backplane.
In this case, use the replacement method or the loopback method to further locate the fault. This
method is applicable in the preliminary process of locating faults when spare boards are not
available. Other service channels or slots are used to resume the service temporarily.
To modify the configuration in case of pointer justification, modify the tracing direction and the
reference source of the clock.
Summary
This method is used to resume the service temporarily when no spare board is available for the
replacement, or is used in handling the problem of pointer justification. The maintenance
personnel may not find this method convenient.
In addition, save the original configuration before you use this method. Record the steps used
to locate the fault.
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