ADC PG-Flex FRL-842, Руководство пользователя

Страница: 143 / 152

April 22, 2003 SCP-FRL842-013-01H
ADC Telecommunications, Inc. 131
F
AULT
I
SOLATION AND
T
ROUBLESHOOTING
Table 29 provides fault isolation and troubleshooting procedures for the FRL-842.
Table 29. FLL-812/FLL-814 and FRL-842 Fault Isolation
Indicator Probable Cause Solution
PWR LED off One or both HDSL lines are not
connected between the COT Shelf and
FRL-842. Verify the connections at the
FRL-842 and COT Shelf.
Measure 130 Vdc to 260 Vdc between
HDSL_T1 and HDSL_T2 on the RT enclosure
backplane during the periodic power-up time
frame
FLL-812/FLL-814 on-board fuse or office
fuse has blown
If power is present at COT Shelf backplane,
replace the FLL-812/FLL-814
If power is not present at COT Shelf backplane,
replace the CO fuse
FRL-842 power supply has failed Replace the FRL-842
FLL-812/FLL-814 power supply has
failed
Replace the FLL-812/FLL-814
LOOP 1 (2) SYNC LED
flashing or off
The HDSL line is attempting to
synchronize with the CO unit or cannot
detect the HDSL signal from the CO unit.
This is usually an indication that there is
a problem with the HDSL circuit between
the COT and FRL-842.
Verify the HDSL circuits are terminated
correctly and with the correct orientation
Measure the loop length of each HDSL circuit
(shorting the pair at the far end). The loop
length must be less than that shown in Table 1
on page 4 .
LOOP 1 (2) MARGIN
LED on
The HDSL line margin level is below a
preset level
See the previous discussion on the SYNC LED
flashing or off
FAULT LED on Faulty FRL-842 Replace the FRL-842