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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.2.2 Perform a Hairpin on a Source-Node Port
Test the Electrical Cabling
Step 1 Replace the suspect cabling (the cables from the test set to the electrical port) with a cable known to be
good.
If a cable known to be good is not available, test the suspect cable with a test set. Remove the suspect
cable from the electrical port and connect the cable to the Tx and Rx terminals of the test set. Run traffic
to determine whether the cable is good or suspect.
Step 2 Resend test-set traffic on the loopback circuit with a good cable installed.
Step 3 If the test set indicates a good circuit, the problem is probably the defective cable. Replace the defective
cable, then clear the loopback:
a. Double-click the card, then click the appropriate tab:
• Maintenance > DS1 > Loopback
• Maintenance > DS3 > Loopback
• Maintenance > EC1 > Loopback
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (IS,AINS; OOS,DSBLD; or OOS,MT) from the Admin State column
for the port being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 4 If the test set indicates a faulty circuit, the problem might be a faulty port. Continue with the
“1.2.2 Perform a Hairpin on a Source-Node Port” procedure on page 1-6.
1.2.2 Perform a Hairpin on a Source-Node Port
The hairpin test is performed on the first port in the network circuit. A hairpin circuit uses the same port
for both source and destination. Completing a successful hairpin through this port isolates the possibility
that the source port is the cause of the faulty circuit.
Create the Hairpin on the Source-Node Port
Step 1 Connect an electrical test set to the port you are testing.
• If you just completed the “1.2.1 Perform a Facility Loopback on a Source-Node Port” procedure on
page 1-4, leave the electrical test set connected to the electrical port.
• If you are starting the current procedure without the electrical test set connected to the electrical
port, use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the
electrical connectors for the port you are testing.
Step 2 Adjust the test set accordingly.
Step 3 Use CTC to set up the hairpin on the port being tested:
a. Click the Circuits tab and click Create.
b. Give the circuit an easily identifiable name, such as Hairpin1.