NE synchronisation failure
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Overview
The procedure described below should be performed if no valid
timing reference signal is received at the respective external
synchronization input (see Chapter 7, section
).
Procedure
Follow the steps below in the case of an NE synchronization
failure:
............................................................................................................................................................
1
Check for correct cabling and change as necessary.
IF ...
THEN ...
the NE does not
synchronize to the external
clock source,
proceed to step 2.
the NE synchronizes to the
external clock source,
END OF STEPS
..........................................................................................................................................................
2
Check for correct input impedance (75
Ω
, 100/110
Ω
, 120
Ω
) and
change as necessary.
IF ...
THEN ...
the NE does not
synchronize to the external
clock source,
proceed to step 3.
the NE synchronizes to the
external clock source,
END OF STEPS
..........................................................................................................................................................
3
Check for an external fault: input/output reversed or exchange supply
defect.
IF ...
THEN ...
the NE does not
synchronize to the external
clock source,
proceed to step 4.
Installation trouble shooting
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365-374-074
Issue a, April 2002
Lucent Technologies
A - 5