Lucent DDM-2000 OC-3 User And Service Manual page 659

TAP-107
: Trouble Clearing
Page 15 of 28
Table B – RTRV-ALM Message Descriptions (Continued)
Description
inc IMA Link LIF
inc IMA Link LODS
inc IMA Link Misconnect
Alarm
Level
Status
Status
Status
DDM-2000 OC-3 M
Issue 2, February 2000
Meaning
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.
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.
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.
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