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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)
c. Pull the FMEC card outward by the faceplate to unseat it from the shelf assembly.
d. Push the FMEC card back inward by the faceplate to reseat it in the shelf assembly.
Step 2 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the
reinstalled FMEC.
Step 3 If the test set indicates a good circuit, the problem is probably an improperly seated FMEC. Click the
Maintenance > Loopback tabs.
Step 4 Choose None from the Loopback Type column for the port being tested.
Step 5 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Step 6 Click Apply.
Step 7 Click Yes in the confirmation dialog box. Continue with Step 17.
Step 8 If the test set indicates a faulty circuit, the problem is probably a defective FMEC card. Return the
defective FMEC card to Cisco through the RMA process. Log into the Cisco Technical Support Website
at http://www.cisco.com/techsupport for more information or log into
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco
TAC numbers for your country.
Step 9 Remove the faulty FMEC and replace it:
a. Unscrew the screws on the FMEC cover and pull the cover forward.
b. Loosen the faceplate screws that hold the FMEC card in place.
c. Pull the FMEC card outward by the faceplate to unseat it from the shelf assembly.
d. Push the FMEC card back inward by the faceplate to reseat it in the shelf assembly.
Step 10 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the
replacement FMEC card.
Step 11 If the test set indicates a faulty circuit, repeat all of the facility loopback procedures.
Step 12 If the test set indicates a good circuit, the problem is probably the defective FMEC card. Click the
Maintenance > Loopback tabs.
Step 13 Choose None from the Loopback Type column for the port being tested.
Step 14 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Step 15 Click Apply.
Step 16 Click Yes in the confirmation dialog box.
Step 17 Complete the “1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)” procedure
on page 1-13.
1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)
The hairpin test is performed on the XC-VXL 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
isolates the possibility that the cross-connect card is the cause of the faulty circuit. Figure 1-12 shows
an example of a hairpin loopback on a source-node port.
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