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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port (East to West)
If a known-good cable is not available, test the suspected bad cable with a test set. (Refer to manufacturer
instructions for test-set use.) Remove the suspected bad cable from the DSx panel or the EIA 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. If the test set indicates a
good circuit, the problem was probably the defective cable.
Step 3 Replace the defective cable.
Step 4 In card view for the electrical card, depending upon the type, click the Maintenance > Loopback tabs,
Maintenance > DS1 tabs, or Maintenance > DS3 tabs.
Note The DS-3 Admin State is the basis of the DS-1 Derived State.
Step 5 Choose None from the Loopback Type column for the port being tested.
Step 6 Choose the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) from the Admin State column for
the port being tested.
Step 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Step 9 Complete the “Test the Electrical Card” procedure on page 1-31.
Test the Electrical Card
Step 1 Complete the “Physically Replace a Traffic Card” procedure on page 2-273 for the suspected bad card
and replace it with a known-good one.
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. Return the defective
card to Cisco through the RMA process. Contact Cisco Technical Support at 1 800 553-2447.
Step 4 Complete the “Physically Replace a Traffic Card” procedure on page 2-273 for the faulty card.
Step 5 In card view for the electrical card, depending upon the type, click the Maintenance > Loopback tabs,
Maintenance > DS1 tabs, or Maintenance > DS3 tabs.
Note The DS-3 Admin State is the basis of the DS-1 Derived State.
Step 6 Choose None from the Loopback Type column for the port being tested.
Step 7 Choose the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) from the Admin State column for
the port being tested.
Step 8 Click Apply.
Step 9 Click Yes in the confirmation dialog box.
Step 10 Complete the “Test the EIA” procedure on page 1-32.
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