9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. VI-B-23
component failure, check alarms at the remote site.
• Check to see if the communications failure is a both-way or one-way
problem. If both-way, the problem is more likely to be within an NCC/
IDU. If one-way the problem is more likely to be within one of the ODUs
or RAC/Radios at the mux (Tx) or demux (Rx) stages.
Additional Information
The Remote Communications Failure alarm signals that internal communication
between link ends is lost. This communication is carried in the overhead channel,
which also carries NMS, Auxiliary channels and Alarm I/O. The alarm is
triggered from the NCC/IDU.
Bus Facing IF Loopback
Bus facing IF loopback is active. This is a warning alarm.
Probable Cause
IF Loopback has been selected in the CT System Controls screen.
Recommended Actions
To remove the alarm, remove the loopback.
TX Power Mute
Transmitter power amplifier is muted. This is a warning alarm.
Probable Cause
Tx mute has been selected in CT System Controls.
Recommended Actions
To remove the alarm, delete the selection.
Additional Information
Tx mute may be used to mute the online Tx of a protected pair to test the forcing
of a transmitter switch from the remote radio (silent Tx switch command).
ATPC Disabled
The ATPC function has been disabled. This is a warning alarm.
Probable Cause
ATPC has been disabled through a CT command in the System Controls screen.
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