Lof (Bits) - Cisco NCS 2000 series Troubleshooting Manual

LOF (BITS)

DETAILED STEPS
Complete the Clear a Lock-On or Lockout Command, on page 447
If the condition does not clear, log into the Technical Support Website at
for more information or call Cisco TAC (1 800 553-2447).
LOF (BITS)
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: BITS
The Loss of Frame (LOF) BITS alarm occurs when a port on the control card BITS input detects an LOF on
the incoming BITS timing reference signal. LOF indicates that the receiving ONS system has lost frame
delineation in the incoming data.
Note The procedure assumes that the BITS timing reference signal is functioning properly. It also assumes the
alarm is not appearing during node turn-up.
Clear the LOF (BITS) Alarm
SUMMARY STEPS
1. Verify that the line framing and line coding match between the BITS input and the control card :
2. If the alarm does not clear when the line framing and line coding match between the BITS input and the
control card, complete the
DETAILED STEPS
Step 1 Verify that the line framing and line coding match between the BITS input and the control card :
a) In node or card view, note the slot and port reporting the alarm.
b) 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.
c) In node view (single-shelf mode) or shelf view (multishelf mode), click the Provisioning > Timing > BITS Facilities
tabs.
d) Verify that the Coding setting matches the coding of the BITS timing source, either B8ZS or AMI.
e) If the coding does not match, click Coding and choose the appropriate coding from the drop-down list.
f) Verify that Framing matches the framing of the BITS timing source, either ESF or SF (D4).
g) If the framing does not match, click Framing and choose the appropriate framing from the drop-down list.
Note On the timing subtab, the B8ZS coding field is normally paired with ESF in the Framing field and the AMI
coding field is normally paired with SF (D4) in the Framing field.
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
264
procedure.
Physically Replace a Card, on page 453
http://www.cisco.com/c/en/us/support/index.html
procedure for the control card.
Alarm Troubleshooting