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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 Destination 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.
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 defective electrical
card.
Step 5 Clear the terminal loopback state on the port:
a. Double-click the electrical card in the destination node with the terminal loopback.
b. Depending upon the card 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.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) in the Admin State column for
the port being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 Delete the terminal loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 7 Complete the “1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port (East to West)”
procedure on page 1-27.
1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port (East to
West)
The facility loopback test is performed on the destination-node electrical port in the network circuit.
Completing a successful facility loopback on this port isolates the cabling, the electrical card, and the
EIA as possible failure points. Figure 1-15 shows an example of a facility loopback on a destination
DS-N port.
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