User's Manual

5-15
Figure 5 - 6 Troubleshooting Radio RCV Alarms (Sheet 3 of 5)
ASTATUS
Receiver Fault
Receiver On Line
Channel Fail
Radio Dade
Eye Closure
Low RSL
Path Distortion
Radio Frame Loss
RECEIVER
MDR-1083
05/20/05
Loss of radio frame from RCVR in I/O Interface RCVR circuits. Before
starting, check USI for receiver Channel Fail alarms and Common
Command Path
alarm. If there is a Channel Fail alarm, troubleshoot and
clear that alarm first. If there is a Command Path alarm, troubleshoot and
clear that alarm second.
1. Verify farend radio configuration. Is farend radio hot-standby?
Yes, go to 2.
No, go to 4.
2. Check for Radio Frame Loss alarms on both A and B.
Are there Radio Frame Loss radio frame loss alarms on both A
and B?
Yes, go to 3.
No, only A or B has a frame loss alarm, go to 4.
3. Switch farend XMTRs. Do alarms clear?
Yes, replace farend off-line XMTR.
No, replace local I/O Interface on alarmed side. Do alarms clear?
Yes, stop. Procedure is complete.
No, replace local RCVR on alarmed side.
4. Replace local I/O Interface on alarmed side. Do alarms clear?
Yes, stop. Procedure is complete.
No, replace local RCVR on alarmed side.
Note
Always troubleshoot and clear the most severe alarm first.
Channel Fail is the most severe, followed by Radio Frame
Loss and Eye Closure.