Alcatel MDR-8000 User Manual page 55

COMMUNICATION FAILURE BETWEEN CONTROLLER AND
RCVR. MAY BE CAUSED BY MISMATCH BETWEEN
CAPACITY KEYS. IF BOTH A AND B SIDES ARE ALARMED,
REMOVE/REPLACE CONTROLLER. IF ONLY ONE SIDE IS
ALARMED, CHECK RCVR CAPACITY KEY ON FAILED SIDE.
DEGRADED SIGNAL. NORMALLY
THRESHOLD IS PROVISIONED TO
PRECEDE CHANNEL FAIL ALARM.
NORMALLY ON IF CHANNEL FAIL
AND RADIO FRAME ARE ALARMED.
VERIFY RSL ON ANALOG MONITOR
SCREEN. IF RSL IS OK,
REMOVE/REPLACE RCVR. IF NOT:
1. CHECK FOR PATH FADING.
2. CHECK UPSTREAM XMTR.
LOW RSL ON ALARMED RCVR.
ALARM ONLY FUNCTIONS IF
AGC SWITCHING THRESHOLD
IS PROVISIONED ACTIVE.
1. CHECK FOR PATH FADING.
2. CHECK UPSTREAM XMTR.
HIGH LEVEL OF DISTORTION IN
TDE DUE TO EXCESSIVE
MULTIPATH ACTIVITY. CHECK
PATH FOR INTERFERENCE.
Figure 5-6 Troubleshooting DS1/E1 Radio RCV Alarms
RECEIVER
STATUS A
RCV On Line
RCV Provisioning
Channel Fail
Radio Frame Loss
Eye Closure
RSL Status
Path Distortion
Radio Dade
LOSS OF SIGNAL LOCK IN RCVR.
MAY BE DUE TO LOSS OF RCV SIGNAL
OR LO OFF FREQUENCY
1. VERIFY RSL ON ANALOG MONITOR
SCREEN. IF RSL IS OK, GO TO 2.
IF NOT GO TO 3.
2. VERIFY RCVR XTAL FREQUENCY. IF
FREQUENCY IS CORRECT,
REMOVE/REPAIR RCVR. IF NOT,
REMOVE/REPLACE XTAL OSC
SUBBOARD
3. ON ANALOG MONITOR SCREEN VERIFY
RECEIVE LO VOLTAGE IS -3.0 ±0.5V dc.
IF VOLTAGE IS CORRECT CHECK
UPSTREAM XMTR. IF NOT,
REMOVE/REPLACE XTAL OSC
SUBBOARD.
LOSS OF RADIO FRAME IN I/O INTERFACE.
IF A AND B ARE ALARMED, REPLACE I/O
INTERFACE. IF NOT, REPLACE ON LINE
XMTR.
OUT OF DADE RANGE. APPLICABLE TO
HOT-STANDBY RADIO. CHECK CABLE
LENGTHS.
LMW-1028
09/14/02
5-11