Test The Hairpin Circuit - Cisco ONS 15310-CL Troubleshooting Manual

1.2.4 Perform a Hairpin Test on a Destination-Node Port
Step 3 Use CTC to set up the source loopback circuit on the port being tested:
a.
b.
c.
d.
e.
f.
Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Step 4
Use CTC to set up the destination hairpin circuit on the port being tested.
Step 5
Note
For example, in a typical east-to-west slot configuration, a DS-3 port on the source node is one end of
the fiber span, and a DS-3 port on the destination node is the other end.
a.
b.
c.
d.
e.
f.
Confirm that the newly created circuit appears on the Circuits tab list as a one-way circuit.
Step 6
Verify that the circuits connect to the correct slots. For example, verify that source node OC-N port (east
Step 7
slot) is connected to the destination node (west slot). If two east slots or two west slots are connected,
the circuit does not work. Except for the distinct slots, all other circuit information, such as ports, should
be identical.
Step 8 Continue with the

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 indicated
by the test set.
If the test set indicates a good circuit, no further testing is necessary; clear the hairpin circuit:
Step 3
a.
b.
c.
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
1-10
Click the Circuits tab and click Create.
Give the circuit an easily identifiable name, such as Hairpin1.
Set the circuit Type and Size to the normal preferences, such as STS and STS1.
Leave the Bidirectional check box checked and click Next.
In the Circuit Source dialog box, fill in the source Node, Slot, Port, and Type where the test set is
connected and click Next.
In the Circuit Destination dialog box, fill in the destination Node, Slot, Port, and Type (the port in
the destination node) and click Finish.
The destination loopback circuit on a port is a one-way test.
Click the Circuits tab and click Create.
Give the circuit an easily identifiable name, such as Hairpin1.
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 previous
circuit 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.
Chapter 1 General Troubleshooting
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