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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)
Step 5 Choose None from the Loopback Type column for the port being tested.
Step 6 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Step 7 Click Apply.
Step 8 Click Ye s in the confirmation dialog box.
Step 9 If the test set indicates a faulty circuit, the problem might be a faulty electrical card, faulty cabling from
the electrical card to the connection panel or the FMECs. Complete the “Test the Electrical Cabling”
procedure on page 1-26.
Test the Electrical Cabling
Step 1 Replace the suspect cabling (the cables from the test set to the electrical connection panel or the FMEC
card ports) with a known-good cable.
If a known-good cable is not available, test the suspected bad cable with a test set. Remove the suspected
bad cable from the electrical connection panel or the FMEC card and connect the cable to the Tx and Rx
terminals of the test set. Run traffic to determine whether the cable is good or defective.
Step 2 Resend test traffic on the loopback circuit with a known-good cable installed.
Step 3 If the test set indicates a good circuit, the problem was probably the defective cable. Replace the
defective cable.
Step 4 Double-click the card to display the card view.
Step 5 Click the Maintenance > Loopback tabs.
Step 6 Choose None from the Loopback Type column for the port being tested.
Step 7 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Step 8 Click Apply.
Step 9 Click Ye s in the confirmation dialog box.
Step 10 Complete the “Test the Electrical Card” procedure on page 1-26.
Test the Electrical Card
Step 1 Complete the “Physically Replace a Traffic Card” procedure on page 2-271 for the suspected bad card
and replace it with a known-good one.
Caution Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the “2.10.2 Protection Switching,
Lock Initiation, and Clearing” section on page 2-260 for basic instructions. For detailed information,
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, “Maintain the Node.”
Step 2 Resend test traffic on the loopback circuit with a known-good card installed.
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