User Manual

ADCP-75-110 • Issue 2B • July 2001
Page 44
© 2001, ADC Telecommunications, Inc.
Table 10. Troubleshooting Installation Problems, continued
PROBLEM 6
The OK/NOK LED indicator on the DHU or DEU is RED or blinking RED and the STATUS indicator
on the corresponding DRU is RED or blinking RED.
DHU OR DEU
FORWARD PATH LINK
REVERSE PATH LINK
DRU 3
= RED
= GREEN
16437-A
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Forward and reverse path optical links
reversed.
2. Faulty forward and reverse path optical links.
3. Faulty DHU, DEU, or DRU.
1. Verify forward and reverse path optical
connections at the DHU or DEU are correct.
2. Test optical links and repair or replace as required.
3. Replace defective unit.
PROBLEM 7 The OK/NOK LED indicator on the DHU or DEU is RED or blinking RED and the HOST PORT LED
indicator on the corresponding remote DEU is GREEN.
DHU OR DEU
FORWARD PATH LINK
REVERSE PATH LINK
REMOTE DEU
(Port 3)
= RED
= OFF
= GREEN
16438-A
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty reverse path optical link.
2. Faulty optical transmit port at remote DEU.
3. Faulty optical receive port at DHU or DEU.
1. Test optical link and repair or replace as required.
2. Replace remote DEU.
3. Replace DHU or DEU.
PROBLEM 8 The OK/NOK LED indicator on the DHU or DEU is GREEN and the HOST PORT LED indicator on
the corresponding remote DEU is RED or blinking RED.
DHU OR DEU
FORWARD PATH LINK
REVERSE PATH LINK
REMOTE DEU
(Port 3)
= RED
= OFF
= GREEN
16439-A
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty forward path optical link.
2. Faulty optical receive port at remote DEU.
3. Faulty optical transmit port at DHU or DEU.
1. Test optical link and repair or replace as required.
2. Replace remote DEU.
3. Replace DHU or DEU.
PROBLEM 9 The OK/NOK LED indicator on the DHU or DEU is RED or blinking RED and the HOST PORT LED
indicator on the corresponding remote DEU is RED or blinking RED.
DHU OR DEU
FORWARD PATH LINK
REVERSE PATH LINK
REMOTE DEU
(Port 3)
= RED
= OFF
= GREEN
16440-A
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Forward and reverse path optical links
reversed.
2. Faulty forward and reverse path optical links.
1. Switch forward and reverse path optical
connections at the DHU or DEU.
2. Test optical links and repair or replace as required.
PROBLEM 10 The STATUS LED indicator on the DRU stays OFF when the PORT 1-6 ON/OFF switch at the DHU or
DEU is placed in the ON position or when the ac/dc converter is connected.
DHU OR DEU
FORWARD PATH LINK
REVERSE PATH LINK
DRU 3
= RED
= OFF
= GREEN
16441-A
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Faulty DC power cord or plug not seated.
2. DC power cord too long.
3. Insufficient DC power output from DHU,
DEU, or ac/dc converter.
1. Test DC power cord and plug. Correct as required.
2. Verify power cord does not exceed 500 meters.
3. Verify DC voltage level at DRU is between 34
and 48 Vdc. Replace DHU, DEU, or ac/dc
converter if voltage is outside specified range.