Specifications

2-13
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
e. If the circuit is now good, the cross-connect card may have had a temporary problem that is now
cleared by the side switch.
Step 38 Click Apply and click the Circuits tab.
Step 39 To eliminate the possibility of faulty OC-N cards:
a. Replace the suspect source OC-N card with a known good card.
b. Resend test set traffic on the loopback circuit with a known good card.
c. If the circuit is now good, the problem was probably the defective card. Return the defective card to
Cisco. Call the Technical Assistance Center (TAC) at 1-877-323-7368 to open an RMA case.
d. Repeat steps a – b for the suspect destination OC-N card.
e. If the circuit is now good, skip to the “Perform a Terminal Loopback on a Destination DS-N Card”
procedure on page 2-6.
If the test traffic is not received or is poor quality and the OC-N card is a known good card, then the
fiber span is suspect.
Step 40 To test a suspect fiber span, see the“Faulty Fiber-Optic Connections” section on page 2-29 and return to
Step 41.
Step 41 If you now have a valid fiber span, resend test set traffic on the loopback circuit.
Step 42 Examine the test traffic being received by the test set. Look for errors or any other signal information
that the test set is capable of indicating.
Step 43 If you do not have a valid test signal or a valid fiber span, try to obtain access to another known good
span, hook the source and destination OC-N cards to the known good span, and resend the test signal.
Step 44 If you do not have a valid signal with a known good span, valid OC-N cards, and a valid cross-connect
card, repeat the “Perform a Hairpin on a Destination Node” procedure on page 2-10 to try and determine
the problem, or call the Cisco Technical Assistance Center (TAC) at 1-877-323-7368 and explain the
situation.
Step 45 If you have a valid test signal with the known good span, replace or fix the original fiber span to obtain
a valid circuit. Next go to “Perform a Hairpin on a Destination Node” procedure on page 2-10.
Step 46 Highlight the newly-created hairpin circuit.
Step 47 Click Delete.
Step 48 Proceed to the “Perform a Facility Loopback on a Destination DS-N Card” procedure on page 2-13.
Procedure: Perform a Facility Loopback on a Destination DS-N Card
The final test is a facility loopback performed on the last card in the circuit; in this case the DS-N card
in the destination node. Completing a successful facility loopback on this card eliminates the possibility
that the destination node cabling, DS-N card, LIU, or EIA is responsible for a faulty circuit.