Lof (Ds3); Lof (Oc-N) - Cisco ONS 15327 User Documentation
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Also See for ONS 15327:
- Procedure manual (478 pages) ,
- Manual (42 pages) ,
- Reference manual (166 pages)
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Chapter 14
Alarm Troubleshooting
b.
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h.
14.4.69 LOF (DS3)
•
The LOF alarm indicates that the receiving ONS 15327 lost frame delineation in the incoming data. The
framing of the transmitting equipment may be set to a format that differs from the receiving ONS 15327.
On XTC-28-3 cards, the alarm occurs only on cards with the provisionable framing format set to C-bit
or M23, not on cards with the provisionable framing format is set to unframed.
Procedure: Clear the LOF Alarm on the XTC-28-3 Card
Change the line type of the non-ONS equipment attached to the reporting card to C-bit.
14.4.70 LOF (OC-N)
•
The LOF alarm means a port on the reporting OC-N card has an LOF condition. LOF indicates that the
receiving ONS 15327 has lost frame delineation in the incoming data. LOF occurs when the SONET
overhead loses a valid framing pattern for three milliseconds. Receiving two consecutive valid A1/A2
framing patterns clears the alarm.
LOF on an OC-N card is sometimes an indication that the OC-N card reporting the alarm expects a
specific line rate and the input line rate source does not match the input line rate of the optical receiver.
June 2002
Find the coding and framing formats of the signal source for the card reporting the alarm. You may
need to contact your network administrator for this information.
Display the card-level 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.
If the signal source line type does not match the reporting port, click Line Type to reveal a menu.
Choose the matching type.
Verify that the reporting Line Coding matches the signal source line type.
If the signal source line coding does not match the reporting port, click Line Coding to reveal the
menu. Choose the matching type and click Apply.
On the Line tab, the B8ZS coding field is normally paired with ESF in the Framing field.
Note
AMI coding is normally paired with SF (D4) in the Framing field.
When you replace a card with an identical type of card, you do not need to make any changes
Note
to the database.
Critical, Service-Affecting
Critical, Service-Affecting
Cisco ONS 15327 User Documentation, R3.3
Alarm Procedures
14-51
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