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Table 12. PLL-735 LED Indicators
LED
Color
State
PWR
Green
On
HDSL in sync
Flash
HDSL not in sync
Off
Unit not powered
SYNC
Green
On
HDSL in sync to RT
Flash
HDSL attempting to sync
Off
No RT detected
MARGIN Yellow
On
CO margin below threshold
Flash
RT margin below threshold
Off
CO and RTmargins above
threshold
TEST
Yellow
On
Subscriber drop test in
progress
Off
No drop test in progress
FAULT
Red
On
Fault in unit
Flash
Alarm in unit
Off
No fault in unit
Table 13 describes the LED indicator status on the front
panel of the FLL-814. Refer to Table 15 for fault isolation
and troubleshooting procedures.
Table 13. FLL-814 LED Indicators
LED
Color
State
PWR
Green
On
Unit is powered
Flash
Unit attempting to power RT
or doubler
Off
Unit is not powered
SYNC n
Green
On
HDSL Loop n is in sync with
RT or doubler
Flash
HDSL Loop n is attempting to
sync with RT or doubler
Off
No RT or doubler detected
MARGIN n Yellow On
HDSL Loop n CO margin
below threshold
Flash
HDSL Loop n RT margin
below threshold
Off
CO and RT margins above
threshold
TEST
Yellow On
Subscriber drop test in
progress
Off
No drop test in progress
Table 13. FLL-814 LED Indicators
LED
Description
ALARM
FAULT
FAULT ISOLATION AND
TROUBLESHOOTING
This section provides information on fault isolation and
troubleshooting based on front panel LED indicators.
Additional information on system performance and alarms
can be found by connecting a VT-100 terminal or PC running
VT-100 emulation software to the RS-232 connector on the
front panel of the AMU-912 and viewing the screens for
each of the units. Refer to the technical documentation for
each unit for detailed information on accessing and
interpreting these screens. If you need additional assistance,
contact Technical Support
(see page 11).
PLL-735 Fault Isolation and Troubleshooting
Description
Table 14 provides fault isolation and troubleshooting
procedures for the PLL-735.
Color
State
Description
Red
On
CO alarm condition exists
Flash
RT alarm condition exists
Off
No alarm condition exists
Red
On
Fault in unit
Off
No fault in unit
Page 6 of 11
Table 14. PLL-735 Troubleshooting and Fault
Isolation
Indicator
Probable Cause
All LEDs
No input power,
Verify fuses on bay fuse
off
PLL-735 fuse blown,
panel.
or PLL-735
processor stopped
Check input power in the
COT shelf battery
terminations.
Remove and re-insert the
PLL-735.
Verify that no alarms
exist on the PLL-735
main screen. If you
cannot view the main
screen, replace the PLL-
735
Replace the PLL-735
PWR LED
HDSL loop open or
Check HDSL loop
Flashing
HDSL ground fault
continuity and length.
detected
PLL-735 power supply
or RT fault. Replace
PLL-735, then RT.
FAULT
PLL-735 fault
Remove and re-insert the
LED on
detected
PLL-735.
Replace the PLL-735.
FAULT
PLL-735 has
Clear the alarm(s)
LED
detected an alarm
displayed on the pll-735
Flashing
condition
main screen.
Solution
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