Cisco ONS 15454 - 1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West); Create the Hairpin Circuit on the Destination-Node Port

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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)
1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to
West)
The hairpin test is performed on the cross-connect card in the network circuit and uses the same port as
source as well as destination. Completing a successful hairpin through the card isolates the possibility
that the cross-connect card is the cause of the faulty circuit. Figure 1-16 shows an example of a hairpin
loopback on a destination-node port.
Figure 1-16 Hairpin on a Destination-Node DS-N 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 Destination-Node Port” procedure on page 1-33.
Create the Hairpin Circuit on the Destination-Node Port
Step 1 Connect an electrical test set to the port you are testing:
a. If you just completed the “1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port
(East to West)” procedure on page 1-27, leave the electrical test set hooked up to the electrical port
in the destination node.
b. If you are starting the current procedure without the electrical test set hooked up to the electrical
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.
d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as Hairpin1.
e. Choose the Size, such as STS-1.
Destination
ONS Node
DS-N OC-NXC
Source
ONS Node
Intermediate
ONS Node
Test Set
DS-N XC OC-N DS-N XC OC-N
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