Lucent DDM-2000 OC-3 User And Service Manual page 658

363-206-285
Issue 2, February 2000
Table B – RTRV-ALM Message Descriptions (Continued)
Description
inc LAN fail (from cust_lan)
inc LAN fail (from sonet)
inc LAN Link LOCD
Alarm
Level
MJ
MJ
Status
DDM-2000 OC-3 M
Trouble Clearing:
Meaning
This message indicates cable disconnect from the
10/100BaseT interface of the IMA LAN circuit pack.
If the cable is connected this alarm indicates that
the IMA LAN circuit pack is not receiving valid link
test pulses from other LAN terminating equipment.
The following guidelines are used for AIDs in this
case: If the IMA LAN circuit pack is in LOW SPEED
GROUP-A-1 and LOW SPEED GROUP-A-2 and
the LAN interface fails, this alarm is created, and
ONLY the first port address a-1 is used; even if
multiple cross-connected channels already exist on
the circuit pack.
This message indicates failure from the SONET
side into the IMA LAN circuit pack. A more detailed
description of the failure should be indicated in an
associated status message. The corresponding
AID follows the same guidelines as for the previous
message.
This status message indicates a loss of cell
delineation (LOCD) failure from the SONET side
into the IMA LAN circuit pack. An LOCD condition
may result from a failure of the ATM (Asynronous
Transfer Mode) mapping function in local or far-end
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.
ULTIPLEXER
TAP-107
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