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Cisco ONS 15327 Troubleshooting Guide, R3.4
March 2004
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Procedure: Clear the LOF (BITS) Alarm
Step 1 Verify that the framing and line coding match between the BITS input and the XTC:
a. In node view or card view, note the slot and port reporting the alarm.
b. Find the framing and coding 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. Click the Provisioning > Timing tabs to display the General Timing window.
d. Verify that the Coding field matches the coding of the BITS timing source (B8ZS or AMI).
e. If the coding does not match, click Coding and choose the appropriate coding from the drop-down
menu.
f. Verify that the Framing field matches the framing of the BITS timing source, either SF (D4) or ESF.
g. If the framing does not match, click Framing and choose the appropriate framing from the
drop-down menu.
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.
Step 2 If the alarm does not clear when the line framing and line coding match between the BITS input and the
XTC, complete the “Physically Replace a Card” procedure on page 2-130 for the XTC card.
Note When replacing a card with an identical type of card, no additional CTC provisioning is
required.
Step 3 If the alarm does not clear, log onto http://www.cisco.com/tac for more information or call TAC to report
a service-affecting problem (1-800-553-2447).
2.6.105 LOF (DS-1)
• Major (MJ), Service Affecting (SA)
The DS-1 LOF alarm indicates that the receiving ONS 15327 has lost frame delineation in an incoming
DS-1 data stream.
Procedure: Clear the LOF (DS-1) Alarm
Step 1 Verify that the line framing and line coding match between the DS-1 port and the signal source:
a. In CTC, note the slot and port reporting the alarm.
b. Find the coding and framing formats of the signal source for the card reporting the alarm. You might
need to contact your network administrator for the format information.
c. Display the card view of the reporting XTC.
d. Click the Provisioning > DS1 > Line tabs.