Lucent Technologies FiberReach DDM-2000 - Page 1423

363-206-305 Trouble Clearing:
TAP-107
Issue 3, June 2000 Page 17 of 22
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
inc. VT AIS CR, MJ,
MN, or
None
The system has detected VT path alarm indication
signal (AIS) incoming from the active OC-3/OC-12
line. The system responds by transmitting DS1
AIS toward the DSX-1 and VT yellow toward the
fiber from which the AIS is being received.
Likely cause:
Incomplete or incorrect
cross-connect provisioning in end-to-end network
(In ring applications, this alarm may be caused by
fiber or
OLIU
circuit pack failures). Unprotected
removal or failure of a
DS1
,
DS1PM
, or
T1EXT
circuit pack at the far end.
inc. VT LOP MJ or MN The system has detected a VT loss-of-pointer
(LOP) condition.
Likely cause:
Unprotected failure of a
DS1
,
DS1PM
, or
T1EXT
circuit pack at the near end or
far end; unprotected failure of an
MXRVO
circuit
pack at the far end; unprotected failure of a
OLIU
circuit pack at the near end or far end; unprotected
failure of a protection
OLIU
circuit pack at the far
end.
inc. VT sig degrade (BER) MJ or MN In a VT path switched ring, the system has
detected a VT error rate that exceeds the
provisioned threshold of 10
–5
to 10
–8
. The system
selects a good VT signal from the other ring path.
Likely cause:
An
OLIU
circuit pack failure or a
fiber failure at some point on the failed ring.
inc. VT unequipped MJ or MN The system has detected the unequipped code
(SONET path overhead VT signal code label
byte=0) on an in-service VT1.5 channel.
Likely cause:
An upstream VT1.5 cross connect
has been deleted or a DS1 LOW SPEED slot has
been unequipped.
inc. VT yellow NE ACTY The far end is detecting VT AIS or VT LOP and
inserting VT yellow in its transmit signal.
Likely cause:
Unprotected failure of a
DS1
,
DS1PM
, or
T1EXT
circuit pack at the near end, a
DS1
,
DS1PM
, or
T1EXT
circuit pack at the far end,
an
MXRVO
circuit pack at the near end, an
MXRVO
circuit pack at the far end, or fiber at some
point in the end-to-end path.
inconsistent DCC values MJ The Network Side/User Side parameters are set
the same at both ends of a DCC (optical span).
(See the set-fecom: command.)
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level Meaning