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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.5.2 Perform a Terminal Loopback on a Source-Node Ethernet Port
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 4 Complete the “Test the Ethernet Card” procedure on page 1-71.
Test the Ethernet 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 Clear the facility loopback:
a. Click the Maintenance > Loopback tabs.
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (IS; OOS,DSBLD; OOS,MT) from the Admin State column for the port
being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 6 Complete the “1.5.2 Perform a Terminal Loopback on a Source-Node Ethernet Port” procedure on
page 1-71.
1.5.2 Perform a Terminal Loopback on a Source-Node Ethernet Port
The terminal loopback test is performed on the node source Ethernet port. For the circuit in this example,
it is the source G-Series port in the source node. You first create a bidirectional circuit that starts on the
node destination G-Series port and loops back on the node source G-Series port. You then proceed with
the terminal loopback test. Completing a successful terminal loopback to a node source port verifies that
the circuit is good to the source port. Figure 1-31 shows terminal loopback on a G-Series port.
Note Terminal loopbacks are not available for R4.0 and earlier G-Series cards.
Note Terminal loopbacks require on-site personnel.
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