12 Aviat Networks
To remove the alarm, remove the loopback.
Line Facing IF Loopback
Line facing IF loopback is active. This is a warning alarm.
Probable Cause
IF Loopback has been selected in the Portal System Controls screen.
Recommended Actions
To remove the alarm, remove the loopback.
CAUTION: use extreme care if attempting to measure
voltage at the RAC/IDU front panel ODU connector, or at the
ODU end of the cable. Inadvertently shorting the inner to
outer will blow the surface-mounted PCB fuse on the RAC
module, which is not a field replaceable item. Aviat repair
will not be covered by warranty.
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 Portal Performance
screen. If not readable, it confirms a telemetry 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.
ODU RX Cable Unplugged
Cannot detect ODU RX cable. This is a critical alarm.
Probable Cause
Cable is disconnected or faulty.
Recommended Actions
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