Cisco ONS 15454 - 1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East); Create the Hairpin Circuit on the Source-Node Electrical Port

1-15
Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)
Step 16 Complete the “1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)” procedure
on page 1-15.
1.2.2 Perform a Hairpin Test on a Source-Node Electrical 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. Figure 1-12 shows an example
of a hairpin loopback on a source-node port.
Figure 1-12 Hairpin on a Source-Node Port
Note The ONS 15454 does not support simplex operation on the cross-connect card. Two cross-connect cards
of the same type must be installed for each node.
Note Hairpin loopbacks require on-site personnel.
Complete the “Create the Hairpin Circuit on the Source-Node Electrical Port” procedure on page 1-15.
Create the Hairpin Circuit on the Source-Node Electrical Port
Step 1 Connect an electrical test set to the port you are testing:
a. If you just completed the “1.2.1 Perform a Facility Loopback on a Source Electrical Port
(West to East)” procedure on page 1-10, leave the electrical test set hooked up to the electrical port
in the source node.
b. 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.
Step 2 Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3 Use CTC to set up the hairpin circuit on the test port:
a. In node view, click the Circuits tab and click Create.
b. In the Circuit Creation dialog box, choose the type, such as STS, and number, such as 1.
c. Click Next.
Source
ONS Node
Destination
ONS Node
55263
OC-N DS-NXCOC-N
Test Set
XCDS-N