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Always troubleshoot and clear the most severe alarm
first.
Frame Loss and Eye Closure.
Loss of radio frame from RCVR in I/O Interface RCVR circuits. Be-
fore starting, check USI for receiver
alarm. If there is a
mon Command Path
shoot and clear that alarm first. If there is a
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.
Figure 5 - 4 Troubleshooting Radio RCV Alarms (Sheet 3 of 5)
5-10
Note
is the most severe, followed by Radio
Channel Fail
alarms and
Channel Fail
Channel Fail
Command Path
Com-
alarm, trouble-
alarm,
STATUS
Receiver Fault
Receiver On Line
Channel Fail
Eye Closure
Low RSL
Path Distortion
Radio Frame Loss
Radio Dade
RECEIVER
A
MDR-1083
05/20/05
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Table of Contents
Troubleshooting
