Fujitsu FLM 150 ADM Maintenance And Trouble Clearing page 84

Maintenance and Trouble Clearing
FJTU-320-515-480
Table 3-68: Threshold Violations-Line (T-CVL, T-ESL, T-SESL, T-UASL)—
AID Type and
Direction
MONTYPE
OC3
CVL
ESL
SESL
UASL
OC12
CVL
ESL
SESL
OC12
UASL
Issue 9, May 1999
Transient Conditions (cont'd)
Probable Cause
RCV/ • Incoming
TRMT interface signal
at far end has a
problem.
• High-speed unit
problems at
intermediate
sites.
• Optical path
problems
between far end
and near end.
• Faulty MC1A
plug-in unit.
RCV • Incoming
interface signal
at far end has a
problem.
• High-speed unit
problems at
intermediate
sites.
• Optical path
problems
between far end
and near end.
• Faulty MC1A
plug-in unit.
TRMT • Incoming
interface signal
at far end has a
problem.
• High-speed unit
problems at
intermediate
sites.
• Optical path
problems
between far end
and near end.
• Faulty MC1A
plug-in unit.
FNC and FNC Customer Use Only
3.70: Threshold Violations-Line
Suggested Corrective Action
• Check the far end for incoming (TRMT) T3
alarms or threshold crossings or PM register
counts (see above).
• Check for alarm conditions at the far end
and at all intermediate sites.
• High-speed unit and fiber problems are not
the likely cause if only one channel is
reporting threshold crossings.
• Replace the suspect MC1A unit if the PM
register count stops incrementing when the
standby unit is on line.
• Check the far end for incoming (TRMT) T3
alarms or threshold crossings or PM register
counts (see above).
• Check for alarm conditions at the far end
and at all intermediate sites.
• High-speed unit and fiber problems are not
the likely cause if only one channel is
reporting threshold crossings.
• Replace the suspect MC1A unit if the PM
register count stops incrementing when the
standby unit is on line.
• Check the far end for incoming (TRMT) T3
alarms or threshold crossings or PM register
counts (see above).
• Check for alarm conditions at the far end
and at all intermediate sites.
• High-speed unit and fiber problems are not
the likely cause if only one channel is
reporting threshold crossings.
• Replace the suspect MC1A unit if the PM
register count stops incrementing when the
standby unit is on line.
Vol. ll, Page 480.3-42