1-13
Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on a DS-N Circuit Path
Step 4 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 the OK button.
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 State column. If this is a multiport card, select the row appropriate for
the desired port.
e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
f. Click the Apply button.
g. Click the Yes button in the Confirmation Dialog box.
Step 5 Proceed to the “Test the Terminal Loopback Circuit on the Destination XTC Port” procedure on
page 1-13.
Procedure: Test the Terminal Loopback Circuit on the Destination XTC Port
Step 1 If the test set is not already sending traffic, send test-set 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:
a. Clear the terminal loopback:
• Double-click the DS-N card in the destination node with the terminal loopback.
• Click the Maintenance > Loopback tabs.
• Select None from the Loopback Type column for the port being tested.
• Select the appropriate state (IS, OOS, or OOS_AINS) in the State column for the port being
tested.
• Click the Apply button.
• Click the Yes button in the Confirmation Dialog box.
b. Clear the terminal loopback circuit:
• Click the Circuits tab.
• Choose the loopback circuit being tested.
• Click the Delete button.
• Click the Yes button in the Delete Circuits dialog box.
c. Proceed to the “Perform a Hairpin on a Destination Node XTC Port” procedure on page 1-14.
