User Manual

ADCP-75-110 • Issue 2B • July 2001
Page 48
© 2001, ADC Telecommunications, Inc.
Table 11. Fault Isolation and Troubleshooting, continued
Alarm Type Major
LED Indicators DHU or DEU:
DRU:
OK/NOK - Red or blinking Red - All other LEDs are green
STATUS - Green
Problem The DHU or DEU is not receiving an optical signal from the DRU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty reverse path optical link between
DHU or DEU and DRU.
2. Faulty optical receive port at DHU or DEU;
or faulty optical transmit port at DRU.
1. Test optical link and repair or replace if faulty
(see Subsection 5.4.2).
2. Test optical ports. Replace DHU, DEU, or DRU
if port is faulty (see Subsection 5.4.1).
Alarm Type Major
LED Indicators DHU or DEU:
DRU:
OK/NOK - Red or blinking Red - All other LEDs are green
STATUS - Red or Blinking Red
Problem The DHU or DEU is not receiving an optical signal from the DRU and the DRU is not receiving
an optical signal from the DHU or DEU; or the DRU detects an internal circuitry fault.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty forward and reverse path optical link
between the DHU or DEU and DRU
2. Faulty DRU.
1. Test optical link and repair or replace if faulty
(see Subsection 5.4.2)
2. Replace DRU.
Alarm Type Major
LED Indicators DHU or DEU:
Supported DEU:
All LEDs are green
HOST PORT - Red or blinking Red - All other LEDs are green
Problem The supported DEU is not receiving an optical signal from the DHU or DEU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty forward path optical link between
DEU or DHU and supported DEU.
2. Faulty optical transmit port at DHU or DEU or
faulty optical receive port at supported DEU.
1. Test optical link and repair or replace if faulty
(see and 5.4.2).
2. Test optical ports. Replace DHU, DEU, or sup-
ported DEU if port is faulty (see Subsection 5.4.1).
Alarm Type Major
LED Indicators DHU or DEU:
Supported DEU:
OK/NOK - Red or blinking Red - All other LEDs are green
All LEDs are green
Problem The DHU or DEU is not receiving an optical signal from the supported DEU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty reverse path optical link between
DEU or DHU and supported DEU.
2. Faulty optical receive port at DHU or DEU or
faulty optical transmit port at supported DEU.
1. Test optical link and repair or replace if faulty
(see and 5.4.2).
2. Test optical ports. Replace DHU, DEU, or sup-
ported DEU if port is faulty (see Subsection 5.4.1).
Alarm Type Major
LED Indicators DHU or DEU:
Supported DEU:
OK/NOK - Red or blinking Red - All other LEDs are green
HOST PORT - Red or blinking Red - All other LEDs are green
Problem The DHU or DEU is not receiving an optical signal from the supported DEU and the supported
DEU is not receiving an optical signal from the DHU or DEU.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty forward and reverse path optical link
between DEU or DHU and supported DEU.
1. Test optical link and repair or replace if faulty
(see and 5.4.2).
(continued)