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

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TAP-107
: Trouble Clearing 363-206-285
Page 15 of 28 Issue 2, February 2000
DDM-2000 OC-3 M
ULTIPLEXER
inc IMA Link LIF
Status This status message indicates a loss of IMA frame
(LIF) failure from the SONET side into the IMA LAN
circuit pack. An LIF condition may result from a
failure of the IMA function in the local or far-end
IMA LAN circuit pack. This message may have a
source address corresponding to one or more DS1
ports assigned to the IMA LAN circuit pack (e.g.
a-1-1
), and should always be accompanied by an
inc LAN fail (from sonet)
alarm.
Likely causes: The most likely cause is a failure of
the local or far-end IMA LAN circuit pack.
Upstream SONET or DS1 facility failures would
normally mask this message with a
inc. DS1
sync. ref. AIS
or
inc. DS1 sync. ref.
LOF
alarm. Failure of an upstream ATM switch in
the path could also produce this message.
inc IMA Link LODS
Status This status message indicates a loss of IMA delay
synchronization (LODS) failure from the SONET
side into the IMA LAN circuit pack. An LODS
condition results from excessive differential delay
between one or more DS1 paths in the IMA
channel. The condition is cleared by changing the
routing of the DS1 channels so that the maximum
differential delay is less than 50 ms. This message
may have a source address corresponding to one
or more DS1 ports assigned to the IMA LAN circuit
pack (e.g.
a-1-1
), and should always be
accompanied by an
inc LAN fail (from
sonet)
alarm.
inc IMA Link Misconnect
Status This status message indicates an IMA link failure
from the SONET side into the IMA LAN circuit
pack. The misconnect condition indicates that the
link in question does not have the correct IMA
Group ID. This message may have a source
address corresponding to one or more DS1 ports
assigned to the IMA LAN circuit pack (e.g.
a-1-1
),
and should always be accompanied by an
inc
LAN fail (from sonet)
alarm.
Likely causes: The most likely cause is a
provsioning error of the far-end IMA termination or
a crossconnect provisioning error. Upstream
SONET or DS1 facility failures would normally
mask this message with a
inc. DS1 sync.
ref. AIS
or
inc. DS1 sync. ref. LOF
alarm.
Table B – RTRV-ALM Message Descriptions (Continued)
Description
Alarm
Level
Meaning