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Overview

Procedure

365-374-059

Issue a, January 2002

The procedure described below should be performed if no valid

timing reference signal is received at the respective external

synchronization input (see Chapter 6, section "NE Synchronisation

Test" (6-10)).

Follow the steps below in the case of an NE synchronization

failure:

............................................................................................................................................................

Check for correct cabling and change as necessary.

IF ...

the NE does not

synchronize to the external

clock source,

the NE synchronizes to the

external clock source,

..........................................................................................................................................................

Check for correct input impedance (75 Ω, 100/110 Ω, 120 Ω) and

change as necessary.

IF ...

the NE does not

synchronize to the external

clock source,

the NE synchronizes to the

external clock source,

..........................................................................................................................................................

Check for an external fault: input/output reversed or exchange supply

defect.

IF ...

the NE does not

synchronize to the external

clock source,

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THEN ...

proceed to step 2.

END OF STEPS

THEN ...