Alcatel-Lucent 9500 MXC User Manual page 754

Recommended Actions
Additional Information
Demodulator Not Locked
Probable Cause
Recommended Actions
Additional Information
Tuner Not Locked
Vol. VI-B-28
Replace the ODU.
Alarm indicates the ODU cable Rx IF frequency is not locked. It is possible for
traffic to pass over a link with IF synthesisers not locked, but it will be errored
with a high BER. This may be checked using local Performance screen
parameters.
Demodulator cannot synchronise to Rx data. This is a critical alarm.
Path loss, or equipment malfunction.
Check other local Link (RAC/Radio) alarms.
1. A path or remote Tx failure is indicated by the absence of upstream Rx
alarms.
• Possible upstream alarms include Rx Synthesiser and Rx IF Synthesiser
alarms.
2. A component failure is indicated by the additional presence of:
• One or more of the upstream alarms indicated in 1) above, or alarms
indicating a loss of communications with the ODU, such as an ODU Cable
Unplugged alarm.
3. A remote Tx failure is indicated in the absence of upstream Rx alarms, and
weather conditions not supporting reasons for a full path fade.
Demodulator unlocked is the primary receive-signal path and equipment alarm.
Always check upstream, towards the ODU, path and remote radio, to ascertain
the cause.
The demodulator is located in the RAC.
An unlocked demodulator will activate downstream path failure and path
warning alarms.
Receive path tuner has failed. This is a critical alarm.
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