TAP-111 : Trouble Clearing 363-206-285
Page 1 of 6 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
Clear OLIU or Fiber Trouble
Linear Extensions
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 circuit packs, ensure that protection switching is
available. When available, use a CIT and the
switch-line:
command
to do a protection switch. The line protection switching request is
unidirectional. It may be necessary to perform a
switch-line:
at the
near end and far end to switch both transmit and receive to the same line.
!
CAUTION:
When removing circuit packs, always remove the one without a lighted
ACTIVE
LED first.
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. A lighted ACTIVE LED indicates that
the OLIU is carrying service (transmitting, receiving, or both).
NOTE:
Because the OC-3 line protection switching request is unidirectional in all
releases, it is possible to have lighted FAULT LEDs on both the service
and protection OLIUs and still be in service. When troubleshooting OLIU
problems, you must first fully analyze the trouble indications. This may be
done by noting LED indications at both ends of the system or using a CIT
at the far-end terminal to log in and using the rtrv-alm: and
rtrv-state-eqpt: commands to check the far-end status.
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