Perform A Hairpin Circuit On A Source Node Xtc Card; Figure 12-14 Hairpin Circuit On A Source Node Xtc Card - Cisco ONS 15327 User Documentation

Network Test Procedures
b.
Step 4 If the MIC card was at fault and has been replaced successfully, proceed to the
Circuit on a Source Node XTC Card" procedure on page

12.10.2 Perform a Hairpin Circuit on a Source Node XTC Card

The second loopback test is a hairpin circuit performed on the first XTC card in the network circuit. A
hairpin circuit uses the same port for both source and destination. Completing a successful hairpin
through this card eliminates the possibility that the source XTC card is the cause of the faulty circuit.

Figure 12-14 Hairpin circuit on a source node XTC card

Test Set A
An XTC card is required to operate the ONS 15327 and can be used in a redundant or non-redundant
Note
configuration.
Procedure: Create the Hairpin Loopback Circuit on the Source Node
Connect an electrical test set to the port you are testing.
Step 1
•
•
•
Use CTC to set up the hairpin loopback on the port being tested.
Step 2
Step 3 Confirm that the newly-created circuit appears with a direction column noting that this circuit is 1-way.
Proceed to the
Step 4
Cisco ONS 15327 User Documentation, R3.3
12-24
Clear the loopback circuit before testing the next segment of the network circuit path.
ONS 15327
Source
XTC
DS-N
MIC
DS-N
If you just completed the "Test the Facility Loopback" procedure on page
test set hooked up to the MIC card.
If you are starting the current procedure without the electrical test set hooked up to the MIC card,
use appropriate cabling to attach the transmit (Tx) and receive (Rx) terminals of the electrical test
set to the MIC connectors for the port you are testing. Both transmit (Tx) and receive (Rx) connect
to the same port.
Adjust the test set accordingly.
"Test the Hairpin Loopback Circuit" procedure on page
12-24.
Hairpin
OC-N OC-N
Chapter 12
"Perform a Hairpin
ONS 15327
Destination
XTC
MIC
12-22, leave the electrical
12-25.
Maintenance
June 2002