Alcatel-Lucent MDR-8000 User Manual page 77

I/O conditioner cannot recover framing
from signal from RCVR module.
1. Is OC3/STM-1 AIS-L Detect alarm
on?
Yes, check for upstream XMTR
OC3/STM-1 AIS-L Detect alarm.
If XMTR OC3 AIS Detect alarm is on,
troubleshoot external MUX equipment
at XMT end. If not, troubleshoot
upstream XMTR.
No, go to 2.
2. Is radio hot-STBY?
Yes
A. Are A and B alarmed?
Yes, troubleshoot XMTR.
No, go to B.
B. Remove/replace RCVR module.
C. Remove/replace alarmed
OC3/STM-1 I/O INTFC.
Figure 5 - 8 Troubleshooting OC3/STM-1 Radio RCV Alarms
Future use
OC3 Output Online
OC3 Common Loss
OC3 LOF
OC3 AIS-L Detect
OC3 Degrade
AIS (blue signal), inserted at MUX
(external to the radio) has been detected
by OC3/STM-1 I/O INTFC RCV circuits.
Troubleshoot external MUX equipment
(fault is not in radio).
Signal from RCVR module (input to
OC3/STM-1 I/O INTFC) has exceeded
provisioned BER threshold (typical fade
condition).
Is OC3/STM-1 LOF also on?
Yes, troubleshoot OC3/STM-1 LOF .
No, and no-fade condition confirmed
1. Replace RCVR module.
2. Replace alarmed
OC3/STM-1 I/O INTFC
module.
MDR-1088
05/23/05
5-19