2-7
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 2 General Troubleshooting
Identify Points of Failure on a Circuit Path
Figure 2-7 Hairpin on a source node
Note The ONS 15454 SDH does not support simplex operation on the cross-connect card. Each ONS
15454 SDH requires Two XC10G cards.
Procedure: Create the Hairpin on the Source Node
Step 1 Connect an electrical test set to the port you are testing.
a. If you just completed the “Perform a Facility Loopback on a Source E3-12 Card” section on
page 2-4, leave the electrical test set hooked up to the E3-12 card.
b. If you are starting the current procedure without the electrical test set hooked up to the E3-12 card,
use appropriate cabling to attach the transmit (Tx) and receive (Rx) terminals of the electrical test
set to the DSx panel or the FMEC card connectors for the port you are testing. The transmit (Tx)
and receive (Rx) terminals connect to the same port.
c. Adjust the test set accordingly.
Step 2 Use CTC to set up the hairpin on the port being tested:
a. Click the Circuits tab and click the Create button.
b. Give the circuit an easily identifiable name, such as hairpin1.
c. Set the Circuit Type and Size to the normal preferences.
d. Uncheck the Bidirectional checkbox and click Next.
e. In the Circuit Source dialog box, fill in the same card and port where the facility loopback test
(E3-12 card in the source node) was performed and click Next.
f. In the Circuit Destination dialog box, use the same card and port used for the Circuit Source dialog
box and click Finish.
Step 3 Confirm that the newly created circuit appears with a direction column indicating that this circuit is
one-way.
Proceed to the “Test the Hairpin Circuit” section on page 2-7.
Procedure: Test the Hairpin Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
ONS 15454
Source
ONS 15454
Destination
76175
STM-N E3-12XCSTM-N
Test Set
XCE3-12
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