User's Manual

ADCP-75-130 • Issue 3C • August 2006
Page 52
© 2006, ADC Telecommunications, Inc.
Table 14. System Fault Isolation and Troubleshooting Guidelines
Alarm Type LED LED COLOR
None All Normal
Problem: Loss of phone service from one DRU. Service normal at all other DRU’s.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. DRU antenna cable disconnected.
2. DRU antenna obstructed or misdirected.
3. DRU antenna faulty.
4. DRU faulty.
1. Re-connect DRU antenna cable to DRU.
2. Remove antenna obstruction or re-orient antenna.
3. Replace antenna.
4. Replace DRU.
Alarm Type LED LED COLOR
None All Normal
Problem: Loss of phone service from all DRU’s.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Local Interface: Faulty forward path coaxial
connections between the DHU, HPCP and
BTS. Faulty reverse path coaxial connec-
tions between the DHU and BTS.
2. Remote Interface: Faulty forward or reverse
path coaxial connections between the DHU
and the RIU. Faulty coaxial connections
between the RIU and donor antenna.
3. Faulty HPCP or RIU.
4. Faulty DHU
5. Fault with cellular network or equipment.
1. Check forward path signals at the HPCP and the
DHU. Check reverse path signals at the BTS.
2. Check forward and reverse path signals at the DHU,
RIU, and donor antenna.
3. Adjust or replace HPCP or RIU.
4. Replace DHU.
5. Contact cell service provider and verify that
cellular network and equipment is operational.
Alarm Type LED LED COLOR
None All Normal
Problem: Calls may be originated and terminated but service is noisy.
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Some electrical device in the immediate
vicinity is creating interference.
1. Try turning off each device that may be causing
interference and see if problem corrects itself.
Alarm Type LED LED COLOR
None All Normal
Problem: Sudden high rate of blocked calls (delay dial tone).
POSSIBLE CAUSE CORRECTIVE ACTION/COMMENTS
1. Too many users for the number of channels
available.
2. Faulty DHU, DEU, or DRU.
1. Wait a few minutes and try dialing again. Upgrade
service if additional channels are required.
2. Replace defective unit.