Cisco ONS 15310-MA Troubleshooting Manual page 87

Chapter 2 Alarm Troubleshooting
Clear the LOF (DS3) Alarm
Change the line type of the non-ONS equipment attached to the reporting port to C bit by completing the
Step 1
following steps:
a.
b.
c.
d.
e.
If the alarm does not clear, log into the Technical Support Website at
Step 2
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.
2.7.122 LOF (E3)
The E3-1 LOF alarm occurs when a port on the reporting E3 port has an LOF condition. LOF 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 milliseconds. Receiving two consecutive
valid A1/A2 framing patterns clears the alarm.
Clear the LOF (E3) Alarm
Verify cabling continuity to the port reporting the alarm. To verify cable continuity, follow site practices.
Step 1
Always use the supplied electrostatic discharge wristband when working with a powered
Caution
ONS 15310-MA SDH.
If cabling continuity is good, clean the fiber according to site practice. If no site practice exists, complete
Step 2
the procedure in the "Maintain the Node" chapter in the Cisco ONS15310-MA SDH Procedure Guide.
Step 3 If the alarm does not clear, see the
the fault causing the LOF alarm.
If the alarm does not clear, or if you need assistance conducting network troubleshooting tests, call
Step 4
Cisco TAC to report a Service-Affecting (SA) problem (1-800-553-2447).
78-18663-01
Double-click the 15310-MA-CTX, E1-21/DS3-E3-3, or E1-63/DS3-E3-3 port to display the card
view.
Click the Provisioning > DS3 > Line tabs.
Verify that the line type of the reporting port matches the line type of the signal source.
If the signal source line type does not match the reporting port, click Line Type and choose C Bit
from the drop-down list.
Click Apply.
Default Severity: Critical (CR), Service-Affecting (SA)
SDH Logical Object: E3
"1.1 Network Troubleshooting Tests" section on page 1-2
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
Alarm Procedures
to isolate
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