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

Page: 1979 / 2536

TAP-107
: Trouble Clearing 363-206-285
Page 23 of 28 Issue 2, February 2000
DDM-2000 OC-3 M
ULTIPLEXER
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 causes: 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 causes: 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 causes: Unprotected failure of a DS1 circuit
pack at the near end, a DS1 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.)
inhibit auto. OS messages
ABN This message occurs when TL1 autonomous alarm
reporting is inhibited by the TL1
INH-MSG
command. This message is cleared by enabling
autonomous message reporting with the TL1
ALW-MSG
command.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level
Meaning