Cisco ONS 15454 Troubleshooting Manual page 342

2.7.201 LOF (DS1)
b.
c.
d.
e.
f.
g.
Step 2 If the alarm does not clear when the line framing and line coding match between the BITS input and the
TCC2/TCC2P, complete the
TCC2/TCC2P.
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
Step 3
for more information or call Cisco TAC 1 800 553-2447 in order to report a Service-Affecting (SA)
problem.
2.7.201 LOF (DS1)
The DS-1 LOF alarm indicates that the receiving ONS 15454 has lost frame delineation in an incoming
DS-1 data stream.
Clear the LOF (DS1) Alarm
Verify that the line framing and line coding match between the DS1 port and the signal source:
Step 1
a.
b.
c.
d.
e.
f.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-148
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 Framing matches the framing of the BITS timing source, either ESF or SF (D4).
If the framing does not match, click Framing 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 Framing
Note
field and the AMI coding field is normally paired with SF (D4) in the Framing field.
"Physically Replace a Traffic Card" procedure on page 2-273
Default Severity: Major (MJ), Service-Affecting (SA)
SONET Logical Object: DS1
In CTC, note the slot and port reporting the alarm.
Find the coding and framing formats of the signal source for the card reporting the alarm. You could
need to contact your network administrator for the format information.
Display the card view of the reporting card.
Click the Provisioning > 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.
Chapter 2 Alarm Troubleshooting
for the
November 2009