Alcatel MDR-8000 User Manual page 166

1
A B
DS1 LINE #
SIDES
TX SIG
TX ALM
RX ALM
LOS has been detected at RCV Input of I/O interface
and AIS (All Ones or Zeros) is being inserted.
Check for LOS at XMT end of HOP. If not,
1. Check for upstream XMTR alarms.
Any XMTR alarms?
Yes, troubleshoot XMTR.
No, go to 2.
2. Replace alarmed DS3 I/O INTFC.
DS1 ALARMS
DS1 Inuput Loss
DS1 XMT ALARM
DS1 AIS INSERT
DS1 RCV ALARM
Figure 5 - 9 Troubleshooting DS3 Radio Wayside DS1 Alarms
5-18
Loss of input signal to I/O Interface, inability to recover clock on alarmed
line, or bipolar violation detection
1. Check presence and quality of DS1/E1 input to radio
2. Enable
DS1 I/O Loopback
for DS1 signal through LBO and I/O interface module.
Continuity?
Yes – replace I/O interface
No – check LBO connectors for open or bent pins.
Transmit hardware failure or buffer spills on alarmed line.
1. Verify quality of TX input data.
2. Replace I/O Interface module.
Loss of receive clock, buffer spills, or alarm insertion signal on the alarmed
line. May also be caused by DS1 driver failure.
Replace I/O Interface module.
Figure 5 - 8 Troubleshooting DS1/E1 Radio Alarms
Loss of input signal to I/O Interface, inability to recover clock on
alarmed line, or bipolar violation detection.
1. Check presence and quality of DS1/E1 input to radio.
2. Replace I/O Interface module.
Transmit hardware failure or buffer spills on alarmed line.
1. Verify quality of TX input data.
2. Replace I/O Interface module.
Loss of receive clock, buffer spills, or alarm insertion signal on
the alarmed line. May also be caused by DS1 driver failure.
Replace I/O Interface module.
on USI control screen for continuity check
Repair as required.
LMW-1030
04/07/05
LMW-3134
04/07/05