Figure - Cisco ONS 15454 Troubleshooting Manual

Chapter 1 General Troubleshooting
Step 16 Complete the
on page
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.
of a hairpin loopback on a source-node port.

Figure 1-12

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 Source-Node Electrical Port
Connect an electrical test set to the port you are testing:
Step 1
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.
November 2009
"1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)" procedure
1-15.
Hairpin on a Source-Node Port
Source
ONS Node
DS-N
"Create the Hairpin Circuit on the Source-Node Electrical Port" procedure on page
If you just completed the
(West to East)" procedure on page
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.
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.
1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)
XC OC-N
"1.2.1 Perform a Facility Loopback on a Source Electrical Port
1-10, leave the electrical test set hooked up to the electrical port
Cisco ONS 15454 Troubleshooting Guide, R8.5
Figure 1-12 shows an example
Destination
ONS Node
OC-N XC DS-N
1-15.
1-15