Lucent Technologies FiberReach DDM-2000 - Page 1416

TAP-107
: Trouble Clearing 363-206-305
Page 10 of 22 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
holdover mode active (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.
illegal CP type CR, MJ or
MN
An illegal or unknown circuit pack type has been
inserted into the shelf.
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 T1
interface, or the energy at the DS1 input is below a
preset threshold.
Likely cause:
Hard failure of upstream equipment
or facility (towards the DSX-1 or T1 interface). The
DS1 input is disconnected at the backplane or the
DSX-1 or T1 interface; equipment is failed or
removed at DSX-1 or T1 interface.
inc.(from DSX) DS1 sig fail MJ, MN or
None
The bit error ratio (BER) in the DS1 signal incoming
from the DSX-1 or T1 interface exceeds the
provisioned failure threshold, 10
-3
, 10
-6
, 10
-7
, or
10
-8
.
Likely cause:
Mismatch of line code (AMI/B8ZS).
Failure of upstream equipment or facility (towards
the DSX-1 or T1 interface). Cross-talk in office
wiring. Failure of the
DS1
,
DS1PM
, or
T1EXT
circuit pack.
inc. (from sonet) DS1 LOF MJ The system is unable to frame on the DS1 signal
from the SONET network.
Likely cause:
Upstream failure in the DS1 signal;
high bit error ratio on the received DS1 signal.
inc. (from sonet) DS1 AIS MJ DS1 alarm indication signal (AIS) is being received
from the SONET network.
Likely cause:
Failure of upstream equipment or
facility in the SONET network.
inc. DS1 sync. ref. AIS MJ or MN DS1 alarm indication signal (AIS) is being received
from the DS1 synchronization reference signal.
Likely cause:
Failure of upstream equipment or
facility (towards the DSX-1).
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning