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

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363-206-285 Trouble Clearing:
TAP-119
Issue 2, February 2000 Page 1 of 4
DDM-2000 OC-3 M
ULTIPLEXER
Clear OLIU or Fiber Trouble
Path Protected Ring
1. !
WARNING:
Open optical connectors may emit invisible laser radiation. Do not view
beam with optical instruments. Avoid direct exposure to the beam. Use of
controls or adjustments or performance of procedures other than those
specified herein may result in hazardous radiation exposure.
!
CAUTION:
When removing OLIU circuit packs or replacing fiber, ensure that all
VT/STS paths are active on the OLIUand fiber that is NOT being
removed or replaced. When available, use a CIT and the
switch-path-( ):all:pri=manual
command to switch all VT/STS
paths to the OLIU and fiber that are not being removed or replaced. It is
also recommended to login to the far end of the OLIU and use the
switch-path-( ):all:pri=manual
command to switch all VT/STS
paths to the OLIU and fiber that are not being removed or replaced.
!
CAUTION:
If timing source has been previously set to optical line (main-1 or main-2)
that has failed, use the
set-sync:src=main-1
or
main-2
command
to select timing source from good optical line.
NOTE:
A lighted FAULT LED on the OLIU indicates that either the receiver, the
transmitter, or both has failed. A flashing FAULT LED on the OLIU
indicates that either the near-end receiver, far-end transmitter, or
incoming (receive) fiber has failed. In a Path Protected Ring network,
both OLIUs are normally ACTIVE. One OLIU carries service on one path
of the ring and the other OLIU carries service on the other path. If
possible, log into shelf associated with source address (for example,
main-2
) of
inc. OC3 LOS
,
inc. OC12 LOS
, or
inc. OC1 LOS
, etc.
to see if circuit pack is removed or failed.
Was OLIU(s) removed or being replaced or installed when alarm occurred?
If YES, then continue with Step 2.
If NO, then proceed to Step 8.