Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 1966 / 2536

363-206-285 Trouble Clearing:
TAP-107
Issue 2, February 2000 Page 10 of 28
DDM-2000 OC-3 M
ULTIPLEXER
(5) the system is provisioned for sync message
signaling, but the upstream system from which it
loop-times has not been provisioned for sync
message signaling. The condition can be cleared
by provisioning both systems the same
(
set-sync:
and
rtrv-sync:
commands).
Condition can be cleared by repairing at least one
of timing references (if both are failed) and
resetting synchronization mode protection switch
with command
switch-sync:s=mode,pri=reset
. In a central
office system, the synchronization mode can also
be reset with a TBOS control point.
illegal CP type
CR, MJ or
MN An illegal or unknown circuit pack type has been
inserted into the shelf.
LAN CP failed
MJ Internal equipment failure of the specified IMA LAN
circuit pack.
inc. (from DSX) DS1 LOS
MJ, MN or
None At least 128 consecutive zeros are received in the
DS1 signal incoming from the DSX-1, or the energy
at the DS1 input is below a preset threshold.
Likely causes: Hard failure of upstream
equipment or facility (towards the DSX-1). The
DS1 input is disconnected at the backplane or the
DSX-1; equipment is failed or removed at DSX-1.
inc.(from DSX) DS1 sig fail
MJ, MN or
None The bit error ratio (BER) in the DS1 signal incoming
from the DSX-1 exceeds the provisioned failure
threshold, 10
–3
, 10
–6
, 10
–7
, or 10
–8
.
Likely causes: Mismatch of line code (AMI/B8ZS).
Failure of upstream equipment or facility (towards
the DSX-1). Cross-talk in office wiring. Failure of
the DS1/DS1PM circuit pack.
inc. DS1 sync. ref. AIS
MJ or MN DS1 alarm indication signal (AIS) is being received
from the DS1 synchronization reference signal.
Likely causes: Failure of upstream equipment or
facility (towards the DSX-1).
inc. DS1 sync. ref. BER
MJ or MN The bit error ratio (BER) in the DS1
synchronization reference signal exceeds 10
–3
.
Likely causes: Failure of upstream equipment or
facility (towards the DSX-1).
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level
Meaning