Threshold Violations-Section - Fujitsu FLM 150 ADM Maintenance And Trouble Clearing

Maintenance and Trouble Clearing
FJTU-320-515-480
3.72

Threshold Violations-Section

The following are the definitions for the section threshold violations:
• CVS: Coding Violation count–Section
• ESS: Errored Second count–Section
• SESS: Severely Errored Second count–Section
• SEFSS: Severely Errored Framing Second count–Section
Table 3-70: Threshold Violations-Section (T-CVS, T-ESS, T-SESS,
AID Type
Direction
MONTYPE
OC3 TRMT
CVS
ESS
SESS
SEFSS
OC3 and OC12 RCV
CVS
ESS
SESS
SEFSS
Issue 9, May 1999
T-SEFSS)—Transient Conditions
Probable Cause
• The optical
tributary input to
the shelf contains
an AIS.
• Optical path
problems between
far end and near
end.
• Faulty MC1A
optical plug-in
unit.
• Improperly set
threshold.
• The optical input
to the shelf
contains an AIS.
• Optical path
problems between
upstream node
and near end.
• Faulty HC6A
optical plug-in
unit.
• Improperly set
threshold.
FNC and FNC Customer Use Only
3.72: Threshold Violations-Section
Suggested Corrective Action
• Inspect and clear alarms from the upstream
tributary equipment for an AIS indication.
• Check and clean all fiber-optic connectors in
the optic path between the tributary
equipment and the FLM 150 ADM shelf.
• Check optical output level at tributary
transmitter.
• Check optical receive level at input to FLM
150 ADM shelf.
• Replace the suspect MC1A unit if the PM
register count stops incrementing when the
other (standby) optical unit is on line.
• Refer to TL1 Commands practice
FJTU-320-515-274, Section 5, Performance
Monitoring Parameters, for the minimum,
maximum, and default parameters.
• Check for alarm conditions at the upstream
node.
• Check optical output level at upstream
transmitter.
• Check the optical receive level at input to local
FLM 150 ADM shelf.
• Replace the suspect HC1A unit if the PM
register count stops incrementing when the
other (standby) optical unit is on line.
• Refer to TL1 Commands practice
FJTU-320-515-274, Section 5, Performance
Monitoring Parameters, for the minimum,
maximum, and default parameters.
Vol. ll, Page 480.3-45