AT&T MERLIN LEGEND Installation & Maintenance Manual page 534

Maintenance and Troubleshooting
Table 5-2 Continued
Error Screen
Code Description
8408
ROTARY
RATE >
12PPS
8409
ROTARY
RATE <
8PPS
840A
BAD
DOWNLINK
MESSAGE
840B
NO LOOP
CURRENT
5-56 Troubleshooting
Possible Cause
Noisy line
Noisy line
Unrecognized
message from the
processor module to
the line/trunk and
station module
Unsteady power
cycle
Communication
problems between
the tine/trunk and
station module
and the CO
No loop current
Solution
Check the far end to
see if it is working and
translated properly.
Check for faulty cable.
Replace line/trunk and
station module as
needed.
Check the far end to
see if it is working and
translated properly.
Check for faulty cable.
Replace line/trunk and
station module as
needed.
Turn power off for at
least 1 second and then
back on. Repeat
system programming
procedure. If problem
persists, replace
line/trunk and station
module.
Swap positions of
similar line/trunk and
station modules. If
problem follows the
module, replace
line/trunk and station
module. If problem
stays at that position,
test Iine/trunk.