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This can occur with electrical interface connections. If two interconnected devices are not
mutually grounded, ground loop interference will occur. Interface in the transport cable will
distort the transport signals. This can cause interconnection failure.
Other problems
Optical power mismatch (long haul, short haul), optical type mismatching (single-mode,
multimode) and so on.
Troubleshooting Principles
To find the cause of a fault categorize it external fault, equipment fault, or interconnection fault.
To locate the equipment faults, follows the procedures below:
1) Check the fibers, and then check the equipment
After confirming that a fault occurs in one or more fibers check this fibers or this set of fibers’
cables first.
If no cable problems are found, then check the equipment.
2) Check the equipment, and then check the modules
When a fault occurs, do not take it for granted that the fault must be with a specific module.
Check all alarms. From the alarm information the root cause of the fault can be determined,
which may have originated somewhere else in the equipment.
3) Query the alarm and performance information
Transport network faults often generate many alarms. Through analysis of these alarms, the
source of the network fault can be found.
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