Colu Fault Indicators - ADC PG-PLUS PRL-779 Manual

SCP-PRL779-015-04H
COLU F I
AULT
At the CO, you can use the VT-100 terminal to initiate a subscriber drop test to determine the cause of any of the
following problems. Table 1
LED Mode
None On processor in the COLU
stopped
Fault On indicates an existing alarm
condition on the COLU
M
argin On • distance limitation
exceeded
• fault in HDSL line
• faulty COLU
M
argin Flashin • distance limitation
g
exceeded
• fault in HDSL line
• faulty RT
SYNC Off • HDSL line has lost
synchronization
• distance limitation may
have been exceeded
• COLU is faulty
• no input power
PWR Off
• on-board fuse is blown on
COLU
PWR Flashin • HDSL line open
g
• an overload exists
PRL-779 List 1E
NDICATORS
provides procedures for isolating faults indicated by the COLU LEDs.
Table 1. COLU LED Fault Isolating
Condition
1 Remove and re-insert the COLU.
2 At the VT-100 interface, go to the COLU Main screen to view the
Performance report to verify that no alarms exist. If the COLU Main
screen cannot be viewed, a communication error exists, indicating a
faulty COLU.
3 If the LEDs do not illuminate, replace the COLU.
1 At the VT-100 interface, go to the COLU Main screen to view the
Performance report to determine the cause of the alarm. Correct the
condition, if possible. If the COLU Main screen cannot be viewed, a
communication error exists.
2 Remove and re-insert the COLU.
3 If the communication error still exists, replace the COLU.
1 At the VT-100 interface, go to the COLU Main screen to view the
Performance report to verify that no alarms exist.
2 Initial installation, check engineering records for distance between COT
shelf and RT.
3 If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
4 Replace the COLU or the RT.
1 Initial installation, check engineering records for distance between COT
shelf and RT.
2 If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
3 Replace the COLU or the RT or both.
1 Initial installation, check engineering records for distance between COT
shelf and RT.
2 If existing installation, measure loss of HDSL line to ensure that the
maximum attenuation value has not been exceeded.
3 Replace the COLU or the RT or both.
1 Ground fault condition exists.
2 Check input COT power at COT shelf backplane with COLU removed.
3 If power is present at COT shelf backplane, replace the COLU.
1 Check line continuity and resistance.
2 COLU power supply or RT may be faulty.
January 6, 2003

COLU Fault Indicators

Procedure
13