ADC PG-FlexPlus AMU-912 Manual page 7

Table 14. PLL-735 Troubleshooting and Fault
Isolation
Indicator Probable Cause
MARGIN HDSL distance linit Verify that no alarms
LED on exceeded, HDSL exist on the PLL-735
loop fault, PLL-735 main screen.If you
fault, or RT fault cannot view the main
screen, replace the PLL-
735
Check engineering
records for
distancebetween PLL-
735 abd RT.
Check HDSL loss on
PLL-735 HDSL
performance screen to
ensure maximum
attenuation has not been
exceeded
Replace the PLL-735,
then RT.
MARGIN HDSL distance limit Verify that no alarms
LED exceeded, HDSL exist on the PLL-735
flashing loop fault, or RT main screen. If you
fault cannot view the screen,
replace the PLL-735.
Check engineering
records for distance
between PLL-735 and
RT.
Check HDSL loss on
PLL-735 HDSL
performance screen to
ensure maximum
attenuation has not been
exceeded.
Replace PLL-735, then
RT.
Table 14. PLL-735 Troubleshooting and Fault
Solution Indicator
SYNC LED HDSL loop has lost
off synchronization with
RT, HDSL distance
limit exceeded,
HDSL loop fault, or
PLL-735 or RT fault.
FLL-814 Fault Isolation and Troubleshooting
Table 15 provides fault isolation and troubleshooting
procedures for the FLL-814.
Table 15. FLL-814 Troubleshooting and Fault
Indicator
All LEDs No input power,
off FLL-814 fuse blown,
or FLL-814 processor
stopped
Isolation
Probable Cause Solution
Verify that no alarms
exist on the PLL-735
main screen. If you
cannot view the screen,
replace the PLL-735.
Check engineering
records for distance
between PLL-735 and
RT.
Check HDSL loss on
PLL-735 HDSL
performance screen to
ensure maximum
attenuation has not been
exceeded.
Replace PLL-735, then
RT.
Isolation
Probable Cause Solution
Verify fuses on bay fuse
panel.
Check input power in the
COT shelf battery
terminations.
Remove and re-insert the
FLL-814.
Verify that no alarms
exist on the FLL-814
main screen. If you
cannot view the main
screen, replace the FLL-
814
Replace the FLL-814
Page 7 of 11
Table 15. FLL-814 Troubleshooting and Fault
Isolation
Indicator Probable Cause
FAULT FLL-814 fault Remove and re-insert the
LED on detected FLL-814.
Replace the FLL-814
ALARM FLL-814 alarm On the FLL-814 main
LED on condition exists. screen, display alarm
conditions that exist and
correct the causes.
Replace the FLL-814
ALARM RT alarm condition On the FLL-814 main
LED exists. screen, display alarm
Flashing conditions that exist and
correct the causes.
Replace the RT Line unit.
MARGIN HDSL distance linit Verify that no alarms
LED On exceeded, HDSL loop exist on the FLL-814
fault, PLL-735 fault, main screen.If you
or RT fault cannot view the main
screen, replace the FLL-
814
Check engineering
records for
distancebetween FLL-
814 and RT.
Check HDSL loss on
FLL-814 HDSL
performance screen to
ensure maximum
attenuation has not been
exceeded
Replace the FLL-814,
then RT line unit.
Solution