Vol. VI-B-22 Alcatel-Lucent
Probable Cause
Equipment malfunction.
Recommended Actions
1. Check for other alarms, which may indicate a general loss of communications
with the ODU, in which case check the -48V supply to the ODU, and ODU
cable.
2. If this is the only alarm, and it has been active for at least 5 minutes, reboot
(power off, pause, power on). If the alarm remains, replace the ODU.
Additional Information
Alarm is triggered by a loss of the PPP (point-to-point protocol) link between the
NCC and ODU.
It indicates a failure within the ODU microprocessor, or an active watchdog
event, which should time-out within 5 minutes.
Remote Communications Failure
Cannot establish communications with the remote terminal. This is a major
alarm.
Probable Cause
Path loss or equipment malfunction.
Recommended Actions
1. Check for other alarms:
• If Demodulator Not Locked and Rx path failure and path warning alarms
are active, an Rx path or remote Tx failure is indicated.
• If Demodulator Not Locked is not active (traffic is not affected), a process
or component failure in the radio overhead is indicated, which may be at
the local or remote end, and may also be causing loss of NMS, Auxiliary
channels, and Alarm I/O over the link. The problem may be one-way or
both-way affecting.
2. If there are no traffic affecting path alarms, check NMS operation and ODU
alarms:
• If NMS is lost to the remote end, loss of the overhead channel is indicated.
• If an AUX plug-in is configured for the link, check the Auxiliary Channel
Clock Fail alarm(s). If active, it also indicates loss of the overhead
channel.
• If there are no RAC/Radio or ODU alarms to indicate a local process or
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