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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 2 General Troubleshooting
Identify Points of Failure on a Circuit Path
Step 3 If the test set indicates a good circuit, the problem was probably the defective card.
a. Return the defective card to Cisco through the returned materials authorization (RMA) process. Call
the Cisco Technical Assistance Center (TAC) at 1-800-553-2447 or login to
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of Cisco TAC
toll-free numbers for your country to obtain more information to open an RMA case.
b. Replace the faulty card.
c. Clear the loopback circuit before testing the next segment of the network circuit path.
d. Proceed to the “Perform a Hairpin on a Source Node” section on page 2-6.
Step 4 If the test set indicates a faulty circuit, the problem may be a faulty FMEC.
Proceed to the “Test the FMEC Card” section on page 2-6.
Procedure: Test the FMEC Card
Step 1 Replace the suspect card with a known-good card.
Step 2 Resend test traffic on the loopback circuit with a known-good card installed.
Step 3 If the test set indicates a faulty circuit, repeat all of the facility loopback procedures.
Step 4 If the test set indicates a good circuit, the problem was probably the defective FMEC card.
a. Return the defective card to Cisco through the RMA process. Call the Cisco TAC at 1-800-553-2447
or login to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of
Cisco TAC toll-free numbers for your country to obtain more information to open an RMA case.
b. Replace the faulty card.
c. Clear the loopback circuit before testing the next segment of the circuit path.
Proceed to the “Perform a Hairpin on a Source Node” section on page 2-6.
2.2.2 Perform a Hairpin on a Source Node
The hairpin circuit test is performed on the cross-connect card in the network circuit. A hairpin circuit
uses the same port for both source and destination. Completing a successful hairpin through the card
eliminates the possibility that the cross-connect card is the cause of the faulty circuit. Figure 2-7 shows
an example of a hairpin.
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