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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on an OC-N Circuit Path
b. Replace the faulty card. See the “Physically Replace a Card” procedure on page 2-130 for details.
c. Clear the facility loopback:
• Click the Maintenance > Loopback tabs.
• Choose None from the Loopback Type column for the port being tested.
• Choose the appropriate state (IS, OOS, or OOS_AINS) from the State column for the port being
tested.
• Click the Apply button.
• Click the Yes button in the Confirmation Dialog box.
d. Clear the facility 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.
Step 4 Proceed to the “1.3.7 Perform a Terminal Loopback on a Destination Node OC-N Port” section on
page 1-38.
1.3.7 Perform a Terminal Loopback on a Destination Node OC-N Port
The terminal loopback test is performed on the node destination port in the circuit, in this example, the
destination OC-N port in the destination node. First, create a bidirectional circuit that starts on the node
source OC-N port and loops back on the node destination OC-N port. Then proceed with the terminal
loopback test. Completing a successful terminal loopback to a node destination OC-N port verifies that
the circuit is good up to the destination OC-N. Figure 1-18 shows an example of a terminal loopback on
an intermediate node destination OC-N port.
Figure 1-18 Terminal Loopback on a Destination Node OC-N Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Destination
ONS Node
OC-N
Source
ONS Node
Intermediate
ONS Node
Test Set
OC-N XTC OC-N OC-N XTC OC-N OC-N XTC
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