Test The Hairpin Circuit; Perform A Terminal Loopback On A Destination-Node Port; Create The Terminal Loopback On A Destination-Node Port - Cisco ONS 15310-CL Troubleshooting Manual

Chapter 1 General Troubleshooting
c.
d.
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f.
Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a one-way circuit.
Continue with the
Step 5

Test the Hairpin Circuit

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 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 hairpin loopback circuit.
Clear the hairpin circuit:
a.
b.
c.
d.
e.
If the test set indicates a faulty circuit, there might be a problem with the port. Continue with the
Step 4
"1.2.3 Perform a Terminal Loopback on a Destination-Node Port" procedure on page

1.2.3 Perform a Terminal Loopback on a Destination-Node Port

The terminal loopback test is performed on the node destination port in the circuit. First, create a
bidirectional circuit that originates on the source node electrical port (such as DS-1, DS-3, or EC-1) and
terminates on the destination-node electrical port. Then continue with the terminal loopback test.
Completing a successful terminal loopback to a destination-node port verifies that the circuit is good up
to the destination port.
Performing a loopback on an in-service circuit is service-affecting.
Caution

Create the Terminal Loopback on a Destination-Node Port

Connect an electrical test set to the port you are testing:
Step 1
a.
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Set the circuit Type and Size to the normal preferences, such as STS and STS1.
Uncheck the Bidirectional check box and click Next.
In the Circuit Source dialog box, select the same Node, Slot, Port, and Type where the test set is
connected and click Next.
In the Circuit Destination dialog box, use the same Node, Slot, Port, and Type used for the Circuit
Source dialog box and click Finish.
"Test the Hairpin Circuit" procedure on page
Click the Circuits tab.
Choose the hairpin circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box.
Confirm that the hairpin circuit is deleted from the Circuits tab list.
If you just completed the "1.2.2 Perform a Hairpin on a Source-Node Port" procedure on page
leave the electrical test set connected to the electrical port in the source node.
1.2.3 Perform a Terminal Loopback on a Destination-Node Port
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
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