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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.2.8 Perform a Terminal Loopback on a Source-Node Electrical Port (East to West)
Step 13 Create the terminal loopback on the destination port being tested:
a. Go to the node view of the destination node:
• Choose View > Go To Other Node from the menu bar.
• Choose the node from the drop-down list in the Select Node dialog box and click OK.
b. In node view, double-click the card that requires the loopback, such as the DS-N card in the
destination node.
c. Click the Maintenance > Loopback tabs.
d. Select OOS,MT from the Admin State column. If this is a multiport card, select the row appropriate
for the desired port.
e. Select Terminal from the Loopback Type column. If this is a multiport card, select the row
appropriate for the desired port.
f. Click Apply.
g. Click Yes in the confirmation dialog box.
Step 14 Complete the “Test and Clear the DS-3, DS3N-12, DS3i-N-12, or EC1 Port Terminal Loopback”
procedure on page 1-42.
Test and Clear the DS-3, DS3N-12, DS3i-N-12, or EC1 Port Terminal Loopback
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information
that the test set is capable of indicating.
Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit.
Double-click the electrical card in the destination node with the terminal loopback.
Step 4 Click the Maintenance > Loopback tabs.
Step 5 Select None from the Loopback Type column for the port being tested.
Step 6 Select the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) in the Admin State column for the
port being tested.
Step 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Step 9 Clear the terminal loopback:
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 10 Complete the “Test the Source Electrical Card” procedure on page 1-45.
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