Cisco ONS 15454 Troubleshooting Manual page 77

Chapter 1 General Troubleshooting
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.
loopback on a destination-node port.
Figure 1-16 Hairpin on a Destination-Node DS-N Port
ONS Node
DS-N
Test Set
The ONS 15454 does not support simplex operation on the cross-connect card. Two cross-connect cards
Note
of the same type must be installed for each node.
Hairpin loopbacks require on-site personnel.
Note
Complete the
Create the Hairpin Circuit on the Destination-Node Port
Step 1 Connect an electrical test set to the port you are testing:
a.
b.
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 2
Use CTC to set up the hairpin circuit on the test port:
Step 3
a.
b.
c.
d.
e.
November 2009
Source
XC OC-N
"Create the Hairpin Circuit on the Destination-Node Port" procedure on page
If you just completed the
(East to West)" procedure on page
in the destination node.
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.
In node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type, such as STS, and number, such as 1.
Click Next.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as Hairpin1.
Choose the Size, such as STS-1.
1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)
Intermediate
ONS Node
DS-N XC OC-N
"1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port
1-27, leave the electrical test set hooked up to the electrical port
Cisco ONS 15454 Troubleshooting Guide, R8.5
Figure 1-16 shows an example of a hairpin
Destination
ONS Node
DS-N XC OC-N
1-33.
1-33