OPU-1
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
GENERAL DESCRIPTION - Rev 7 (May 2019)
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4.3
MONITORING MENU
The monitoring menu allows information to be gained about the state of each terminal of
the link.
The monitoring of the remote terminal is carried out by transmitting data through the
internal communication channel, which can only take place when the channel is not used
for link synchronization and when there are no transitions in the signalling channel. If
signalling appears while data are being transmitted, this transmission process is interrupted
and resumed again once the sending of telephone signalling has finished.
The information provided by the monitoring system relating to each terminal is the following:
Terminal alarms, Chronological list of alarms, Chronological list of events, Receive pilot
level, S/N ratio, Quality of the received signal (established with regard to Recommendation
G.821), and the state of module MQPU ports as well as those of the optional modules of
the built-in multiplexer (MXPU or DMPU/TMPU).
❖
Alarm display
The alarms of the terminal that can be monitored from the Management System are the
following:
•
Main and/or secondary power-supply failure.
•
Amplifier overload of 3 s.u. shelf.
•
Low output level in amplifier of 3 s.u. shelf.
•
Loss of synchronism.
•
Pilot loss.
•
Low Signal/Noise ratio.
•
AF limiter operation in analog channel.
•
Temperature alarm.
•
Terminal configuration error.
•
Hardware failure.
•
BER>10
-3
in digital channel.
•
BER>10
-6
in digital channel.
•
Low RCV level in digital channel.
•
RCV level exceeded in digital channel.
•
Failure in G.703 interface input in digital channel.
