Colu Fault Indicators - ADC PRL-783 Manual

Fault Isolation
COLU F I
AULT
At the CO, you can use the VT-100 terminal to initiate a SDT to determine the cause of any of the following
problems. The following sections provide procedures for isolating faults indicated by the COLU LEDs.
No LEDs On
Fault LED On
M LED On
argin
Margin LED
Flashing
SYNC LED Off
14
NDICATORS
•
processor in the COLU stopped
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 you cannot view the COLU Main Screen,
a communication error exists indicating a faulty COLU.
3 If the LEDs do not illuminate, replace the COLU.
• indicates an existing alarm condition on 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 you
cannot view the COLU Main Screen, a communication error exists.
2 Remove and re-insert the COLU.
3 If the communication error still exists, replace the COLU.
• distance limitation exceeded
• fault in HDSL line.
• faulty 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 COTS and RT.
3 If existing installation, measure loss of HDSL line to ensure that the maximum
attenuation value has not been exceeded.
4 Replace COLU and/or the RT.
• distance limitation exceeded
• fault in HDSL line
• faulty RT
1 Initial installation, check engineering records for distance between COTS and RT.
2 If existing installation, measure loss of HDSL line to ensure that the maximum
attenuation value has not been exceeded.
3 Replace COLU and/or the RT.
• HDSL line has lost synchronization
• distance limitation may have been exceeded
•
COLU is faulty
1 Initial installation, check engineering records for distance between COTS and RT.
2 If existing installation, measure loss of HDSL line to ensure that the maximum
attenuation value has not been exceeded.
3 Replace COLU and/or the RT.
January 6, 2003
SCP-PRL783-012-03H
PG-Plus PRL-783