Specifications

1-82
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
Step 2 After you determine that the port is active, verify the signal source being received by the DS-N card
reporting the alarm.
Step 3 If traffic is being affected, delete and recreate the circuit.
Caution Deleting a circuit can be service affecting.
Step 4 Check the far-end OC-N card that provides STS payload to the DS-N card.
Step 5 Verify the cross-connect between the OC-N card and the DS-N card.
Step 6 Clean the far-end optical fiber:
a. Clean the fiber according to local site practice.
b. If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow the
instructions accompanying the product.
Step 7 Replace OC-N/DS-N cards.
Note When you replace a card with an identical type of card, you do not need to make any changes
to the database.
1.4 DS3E Line Alarms
Unlike the standard DS-3 card, which uses the unframed format exclusively, the DS3E card provides
three choices: unframed, M23, or C-bit. The choice of framing format affects which line alarms the
DS3E card reports. The table below lists the line alarms reported under each format.
The choice of framing format does not affect the reporting of STS alarms. Regardless of format, the
DS3E card reports the same STS alarms as the standard DS-3 card.
Table 1-2 DS3E Line Alarms
Alarm UNFRAMED M23 CBIT
LOS
uuu
AIS
uuu
LOF
muu
IDLE
muu
RAI
muu
Terminal Lpbk
uuu
Facility Lpbk
uuu
FE Lpbk
mmu
FE Common Equipment Failure
mmu
FE Equipment Failure-SA
mmu
FE LOS
mmu