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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)
Test the EIA
Step 1 Remove and reinstall the EIA to ensure a proper seating:
a. Remove the lower backplane cover. Loosen the five screws that secure it to the ONS 15454 and pull
it away from the shelf assembly.
b. Loosen the nine perimeter screws that hold the EIA panel in place.
c. Lift the EIA panel by the bottom to remove it from the shelf assembly.
d. Follow the installation procedure for the appropriate EIA. Refer to the “Install the Shelf and
Backplane Cable” chapter in the Cisco ONS 15454 Procedure Guide for instructions.
Step 2 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the
reinstalled EIA. If the test set indicates a good circuit, the problem was probably an improperly seated
EIA, and you can proceed to Step 16. If the problem persists and the EIA is not shown to be improperly
seated, proceed to Step 3.
Step 3 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 4 Choose None from the Loopback Type column for the port being tested.
Step 5 Choose the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) from the Admin State column for
the port being tested.
Step 6 Click Apply.
Step 7 Click Yes in the confirmation dialog box.
Step 8 If the test set indicates a faulty circuit, the problem is probably a defective EIA. Return the defective EIA
to Cisco through the RMA process. Contact Cisco Technical Support at 1 800 553-2447.
Step 9 Replace the faulty EIA. Complete the “Replace the Electrical Interface Assembly” procedure on
page 2-281.
Step 10 Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the
replacement EIA. If the test set indicates a faulty circuit, repeat all of the facility loopback procedures.
Step 11 If the test set indicates a good circuit, the problem was probably the defective EIA. Clear the facility
loopback by clicking the Maintenance > Loopback tabs, Maintenance > DS1 tabs, or Maintenance >
DS3 tabs.
Step 12 Choose None from the Loopback Type column for the port being tested.
Step 13 Choose the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) from the Admin State column for
the port being tested.
Step 14 Click Apply.
Step 15 Click Yes in the confirmation dialog box.
Step 16 Complete the “1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)”
procedure on page 1-33.
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