Cisco ONS 15310-MA Troubleshooting Manual page 88

Alarm Procedures
2.7.123 LOF (STM)
The LOF alarm occurs when a port on the reporting port has an LOF condition. The alarm indicates that
the receiving ONS 15310-MA SDH has lost frame delineation in the incoming data. LOF occurs when
the SDH overhead loses a valid framing pattern for 3 ms. Receiving two consecutive valid A1/A2
framing patterns clears the alarm.
When the alarm is raised on an STM1 or STM4 port, it is sometimes an indication that the STM1 or
STM4 port expects a specific line rate and the input line rate source does not match the input line rate
of the optical receiver.
Clear the LOF (STM) Alarm
Complete the
Step 1
If the alarm does not clear, or if you need assistance conducting network troubleshooting tests, call
Step 2
Cisco TAC to report a Service-Affecting (SA) problem (1-800-553-2447).
2.7.124 LOF (VCTRM-HP)
Clear the LOF (VCTRM-HP) Alarm
Complete the
Step 1
Step 2 If the alarm does not clear, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC (1 800
553-2447) in order to report a Service-Affecting (SA) problem.
2.7.125 LOGBUFR90
The Log Buffer Over 90 alarm indicates that the per-NE queue of incoming alarm, event, or update
capacity of 5000 entries is over 90 percent full. LOGBUFR90 will clear if CTC recovers. If it does not
clear, LOGBUFROVFL occurs.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
2-88
Default Severity: Critical (CR), Service-Affecting (SA)
SDH Logical Objects: STM, VCTRM-HP
"Clear the LOF (E3) Alarm" procedure on page
Default Severity: Critical (CR), Service-Affecting (SA)
SDH Logical Object: VCTRM-HP
A Loss of Frame alarm for a VC circuit termination indicates that the LOF has occurred at the
terminating point of the circuit (such as an STM-N port). It is similar to the
page 2-88.
"Clear the LOF (STM) Alarm" procedure on page
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SDH Logical Object: SYSTEM
Chapter 2 Alarm Troubleshooting
2-87.
"LOF (STM)" alarm on
2-88.
78-18663-01