User's Manual

5-12
Figure 5-7 Troubleshooting DS3 Radio RCV Alarms
A B
RECEIVER
RCV On Line
RCV Provisioning
Channel Fail
Radio Frame Loss
Eye Closure
RSL Status
Path Distortion
DS3 Frame Loss
DS3 Degraded
DS3 AIS Detect
DS3 AIS Insert
STATUS
I/O INTERFACE CANNOT RECOVER FRAMING
FROM SIGNAL FROM RCVR MODULE.
1. IS DS3 AIS Detect ALARM ON?
YES, CHECK FOR UPSTREAM XMTR
DS3 AIS Detect ALARM. IF XMTR DS3
AIS Detect ALARM IS ON, TROUBLESHOOT
EXTERNAL MUX EQUIPMENT AT XMT END.
IF NOT, TROUBLESHOOT UPSTREAM
XMTR.
NO, GO TO 2.
2. IS DS3 AIS Ins ALARM ON?
YES, CHECK FOR UPSTREAM XMTR
ALARMS. IF ANY XMTR ALARM IS ON,
TROUBLESHOOT UPSTREAM XMTR.
NO, GO TO 3.
3. 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 DS3 I/O
INTFC.
SIGNAL FROM RCVR MODULE (INPUT TO DS3
I/O INTFC) HAS EXCEEDED PROVISIONED BER
THRESHOLD (TYPICAL FADE CONDITION).
IS DS3 Frame Alarm ALSO ON?
YES, TROUBLESHOOT DS3 Frame Alarm.
NO, AND NO-FADE CONDITION CONFIRMED
1. REPLACE RCVR MODULE.
2. REPLACE ALARMED DS3 I/O INTFC
MODULE.
AIS (BLUE SIGNAL), INSERTED AT MUX
(EXTERNAL
TO THE RADIO) HAS BEEN DETECTED BY DS3 I/O
INTFC RCV CIRCUITS.
TROUBLESHOOT EXTERNAL MUX EQUIPMENT
(FAULT IS NOT IN RADIO).
LOS HAS BEEN DETECTED AT RCV INPUT OF DS3
I/O INTFC AND AIS (BLUE SIGNAL) IS BEING
INSERTED.
CHECK FOR LOS AT XMTR END OF HOP. IF NOT,
1. CHECK FOR UPSTREAM XMTR ALARMS.
ANY XMTR ALARMS?
YES, TROUBLESHOOT XMTR.
NO, GO TO 2.
2. REPLACE RCVR MODULE ON ALARMED SIDE.
3. REPLACE ALARMED DS3 I/O INTFC MODULE.
SEE DS1/E1
RCV ALARMS, FIG 5-5
SEE DS1/E1 RCV ALARMS
RCV PROV, FIG 5-5
LMW-3132
07/17/02