Cisco ONS 15454 Troubleshooting Manual page 12

1.3.2 Perform a Hairpin Test on a Source Node Port (West to East)
Click Apply.
Step 14
Click Yes in the confirmation dialog box.
Step 15
Complete the
Step 16
1.3.2 Perform a Hairpin Test on a Source Node Port (West to East)
The hairpin test is performed on the cross-connect card in the network circuit. A hairpin circuit uses the
same port for both source and destination. Completing a successful hairpin through the port isolates the
possibility that the cross-connect card is the cause of the faulty circuit.
of a hairpin loopback on a source node port.
Figure 1-11 Hairpin on a Source Node Port
Test Set
Note The ONS 15454 does not support simplex operation on the XC10G cross-connect card. Two
cross-connect cards of the same type must be installed for each node.
Create the Hairpin Circuit on the Source Node Port
Connect an electrical test set to the port you are testing:
Step 1
a.
b.
c.
Step 2 Use CTC to set up the hairpin circuit on the test port:
a.
b.
c.
d.
e.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1-12
"Perform a Hairpin Test on a Source Node Port (West to East)" procedure on page
Source
ONS Node
DS-N
If you just completed the "Perform a Facility (Line) Loopback on a Source DS-N Port (West to
East)" procedure on page 1-8, leave the electrical test set hooked up to the DS-N port in the source
node.
If you are starting the current procedure without the electrical test set hooked up to the DS-N port,
use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the DSx panel
or the EIA connectors for the port you are testing. The Tx and Rx terminals connect to the same port.
Adjust the test set accordingly.
In node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type and size, such as an STS-1.
Click Next.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
"Hairpin1."
Uncheck the Bidirectional check box.
XC OC-N
Chapter 1 General Troubleshooting
Figure 1-11 shows an example
Destination
ONS Node
OC-N XC DS-N
1-12.
November 2004