Cisco ONS 15310-MA Troubleshooting Manual page 85

Chapter 2 Alarm Troubleshooting
2.7.119 LOF (BITS)
The Loss of Frame (LOF) BITS alarm occurs when a port on the BITS input detects an LOF on the
incoming BITS timing reference signal. LOF indicates that the receiving ONS 15310-MA SDH has lost
frame delineation in the incoming data.
Clear the LOF (BITS) Alarm
Note This procedure assumes that the BITS timing reference signal is functioning properly. It also assumes
the alarm is not appearing during node turn-up.
Step 1 Verify that the line type and line coding match between the BITS port and the ONS 15310-MA SDH by
completing the following steps:
a.
b.
c.
d.
e.
f.
g.
Note
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.
2.7.120 LOF (E1)
The E1 LOF alarm indicates that the receiving ONS 15310-MA SDH has lost frame delineation in an
incoming E1 data stream. If the LOF appears on a E1 port, the transmitting equipment could have its line
type set to a format that differs from the receiving node.
78-18663-01
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SDH Logical Object: BITS
In node view or card view, note the slot and port reporting the alarm.
Find the coding and framing formats of the external BITS timing source. The formats should be in
the user documentation for the external BITS timing source or on the timing source itself.
Click the Provisioning > Timing > BITS Facilities tabs.
Verify that the Coding setting matches the coding of the BITS timing source, either B8ZS or AMI.
If the coding does not match, click Coding and choose the appropriate coding from the drop-down
list.
Verify that Line Type matches the line type of the BITS timing source, either ESF or SF (D4).
If the line type does not match, click Line Type and choose the appropriate framing from the
drop-down list.
On the timing subtab, the B8ZS coding field is normally paired with ESF in the Line Type field
and the AMI coding field is normally paired with SF (D4) in the Line Type field.
Default Severity: Major (MJ), Service-Affecting (SA)
SDH Logical Object: E1
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
Alarm Procedures
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