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Cisco ONS 15310-MA Troubleshooting Manual page 86

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Alarm Procedures
When the ONS 15310-MA SDH raises an LOF (E1) or LOS (E1) alarm, a path protection switch will
Note
occur, but a PDI-P alarm will not be generated due to hardware limitations.
Clear the LOF (E1) Alarm
Verify that the line type and line coding match between the E1 port and the signal source by completing
Step 1
the following steps:
a.
b.
c.
d.
e.
f.
g.
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.
2.7.121 LOF (DS3)
The DS-3 LOF alarm indicates that the receiving 15310-MA SDH CTX, E1-21/DS3-E3-3, or
E1-63/DS3-E3-3 port has lost frame delineation in the incoming DS-3 data stream. The framing of the
transmitting equipment could be set to a format that differs from the receiving system. On DS-3 ports,
the alarm occurs only on when the provisionable line type format set to C bit or M13.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
2-86
In CTC, note the slot and port reporting the alarm.
Find the coding and line type formats of the signal source for the port reporting the alarm. You might
need to contact your network administrator for the format information.
Display the card view of the reporting E1 card (15310-MA SDH CTX, E1-21/DS3-E3-3, or
E1-63/DS3-E3-3).
Click the Provisioning > E1 > Line tabs.
Verify that the line type of the reporting port matches the line type of the signal source (DS4 and
DS4, unframed and unframed, or ESF and ESF). If the signal source line type does not match the
reporting port, click the Line Type cell to reveal a drop-down list and choose the matching type.
Verify that the reporting Line Coding matches the signal source line coding (AMI and AMI or B8ZS
and B8ZS). If the signal source line coding does not match the reporting port, click the Line Coding
cell and choose the correct type from the drop-down list.
Click Apply.
Note
On the Line tab, the B8ZS coding field is normally paired with ESF in the Line Type field.
AMI coding is normally paired with SF (D4) in the Line Type field.
Default Severity: Critical (CR), Service-Affecting (SA)
SDH Logical Object: DS3
Chapter 2
Alarm Troubleshooting
78-18663-01

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