Cisco ONS 15454 SDH Specifications Page 93

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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
Procedure: Test the E3-12 Cabling
Step 1 Replace the suspect cabling (the cables from the test set to the DSx panel or the FMEC card ports) with
a known-good cable.
Step 2 If a known-good cable is not available, test the suspect cable with a test set. Remove the suspect cable
from the DSx panel or the FMEC card and connect the cable to the transmit (Tx) and receive (Rx)
terminals of the test set. Run traffic to determine whether the cable is good or suspect.
Step 3 Resend test traffic on the loopback circuit with a known-good cable installed.
Step 4 If the test set indicates a good circuit, the problem was probably the defective cable.
a. Replace the defective cable.
b. Clear the loopback circuit.
c. The entire E3-12 circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
Step 5 If the test set indicates a faulty circuit, the problem may be a faulty card or a faulty FMEC card.
Proceed to the “Test the E3-12 Card” section on page 2-5.
Procedure: Test the E3-12 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 good circuit, the problem was probably the defective 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.
d. The entire E3-12 circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
Step 4 If the test set indicates a faulty circuit, the problem may be a faulty FMEC card.
Proceed to the “Test the FMEC Card” section on page 2-6.
Procedure: Test the FMEC card
Step 1 Remove and reinstall the FMEC card to ensure a proper seating:
a. Remove the lower backplane cover, loosen the five screws that secure it to the ONS 15454 SDH, and
pull it away from the shelf assembly.
b. Loosen the nine perimeter screws that hold the backplane rear cover in place.
c. Lift the FMEC card panel by the bottom to remove it from the shelf assembly.
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