9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. VI-B-29
Probable Cause
Equipment malfunction.
Recommended Actions
Reboot (power off, pause, power on). If the alarm remains, replace the ODU.
Additional Information
The Tuner supports I/Q demodulation. Failure will affect all receive traffic.
Downstream alarms will be active: Demodulator Not Locked, ODU Cable
Modulator Not Locked, RAC Cable Demodulator Not Locked, and Rx path
failure and warning alarms.
ODU Cable Unplugged
ODU cable unplugged alarm is active. This is a critical alarm.
Probable Cause
The ODU cable is disconnected or faulty.
Recommended Actions
Check The RAC OnLine LEDs for the affected link.
• If alarmed (red), it confirms a problem on the ODU cable, or the -48 Vdc supply
failure to the ODU. Check the ODU cable and connectors, and RAC -48V
Supply alarm.
• If not alarmed (green), it indicates a telemetry problem at the ODU; traffic is
not being affected. Check Detected Tx Power and RSL in the CT Performance
screen. If not readable, it confirms a telmetry problem. Replace the ODU.
Additional Information
The ODU Cable Unplugged alarm is activated by a failure to detect telemetry
data from the ODU. A failure may be due to the cable, the -48Vdc supply to the
ODU, or a problem within the ODU telemetry hardware.
A telemetry failure means all management communication to the ODU is lost. If
the power supply is interrupted, or a soft reset applied, it cannot be configured;
the ODU will not operate.
RAC RX Cable IF Synthesiser Not Locked
The RAC RX cable IF synthesiser is not locked. This is a critical alarm.
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