User`s manual

Chapter 4 Monitoring and Maintenance
81
Message Description Corrective Actions Type Class
module.
STM1_LOF Loss of frame Clean up the Optical
fiber
Alarm Major
STM1_OOF Out of Frame–
A
1,
A
2 incorrect for >=
625 us
OOF state exited when
4 consecutive SDH
frames are received
with valid framing
patterns
Alarm Major
STM1_RS_TIM Regenerator
section trace
identifier
mismatch
Check Regenerator
section Received trace
identifier and Expected
trace identifier setting
Alarm Minor
STM1_MS_AIS Multiplex section
AIS
Check the higher layer
alarms
Alarm Major
STM1_MS_RDI Multiplex section
remote defect
indication
Check Multiplex section
alarm of FAR END
Alarm Minor
STM1_MS_EXC Multiplex section
Excessive Errors
Informative alert Alarm Major
STM1_MS_DEG Multiplex section
Degraded
Informative alert Alarm Minor
STM1_AU_AIS
A
dministrative unit
AIS
Check the higher layer
alarms
Alarm Major
STM1_AU_LOP
A
dministrative unit
loss of pointer
Check Cross Connect
setting of FAR END
Alarm Major
STM1_HP_UNEQ HO path
unequipped
Check the signal label
of received V5 byte
Alarm Minor
STM1_HP_TIM HO path trace
identifier
mismatch
Check HO path
Received trace identifier
and Expected trace
identifier setting
Alarm Minor
STM1_HP_RDI HO path remote
defect indication
Check HO path alarm of
FAR END
Alarm Minor
STM1_HP_EXC Higher Order Path
Excessive Errors
Informative alert Alarm Major
STM1_HP_DEG Higher Order Path
Degraded
Informative alert Alarm Minor