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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
Figure 1-12 Facility Loopback on a Circuit Source OC-N Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Procedure: Create the Facility Loopback on the Source OC-N Port
Step 1 Connect an optical test set to the port you are testing.
Use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. The Tx and Rx terminals connect to the same port. Adjust the test set accordingly.
Step 2 Use CTC to create the facility loopback circuit on the port being tested:
a. In node view, double-click the card where you are performing the loopback.
b. Click the Maintenance > Loopback tabs.
c. Choose OOS_MT from the State column for the port being tested. If this is a multiport card, select
the appropriate row for the desired port.
d. Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a
multiport card, select the appropriate row for the desired port.
e. Click the Apply button.
f. Click the Yes button in the Confirmation Dialog box.
Note It is normal for a LPBKFACILITY condition to appear during loopback setup. The condition
clears when you remove the loopback.
Step 3 Proceed to the “Test the Facility Loopback Circuit” procedure on page 1-22.
Procedure: Test the Facility Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the traffic 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 with the facility loopback:
a. Clear the facility loopback:
• Click the Maintenance > Loopback tabs.
Destination
ONS Node
OC-N OC-NXTC
Source
ONS Node
Intermediate
ONS Node
OC-N OC-NXTCOC-N
Test Set
XTCOC-N
90639