12-24
Cisco ONS 15327 User Documentation, R3.3
June 2002
Chapter 12 Maintenance
Network Test Procedures
b.
Clear the loopback circuit before testing the next segment of the network circuit path.
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 12-24
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
Note
An XTC card is required to operate the ONS 15327 and can be used in a redundant or non-redundant
configuration.
Procedure: Create the Hairpin Loopback Circuit on the Source Node
Step 1
Connect an electrical test set to the port you are testing.
•
“Test the Facility Loopback” procedure on page 12-22
, leave the electrical
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.
Step 2
Use CTC to set up the hairpin loopback on the port being tested.
Step 3
Confirm that the newly-created circuit appears with a direction column noting that this circuit is 1-way.
Step 4
Proceed to the
“Test the Hairpin Loopback Circuit” procedure on page 12-25
.
MIC
OC-N
OC-N
MIC
DS-N
DS-N
Test Set A
Hairpin
XTC
XTC
ONS 15327
Source
ONS 15327
Destination
76188
Summary of Contents for ONS 15327
Page 22: ...Contents xxii Cisco ONS 15327 User Documentation June 2002 I N D E X ...
Page 30: ...Figures xxviii Cisco ONS 15327 User Documentation June 2002 ...
Page 44: ...Procedures xlii Cisco ONS 15454 Installation and Operations Guide R3 2 June 2002 ...
Page 540: ...Glossary GL 16 Cisco ONS 15327 User Documentation R3 3 June 2002 ...