Create The Xc Loopback On The Source-Node Optical Port; Test And Clear The Xc Loopback Circuit - Cisco ONS 15600 SDH Troubleshooting Manual

1.2.3 Perform an XC Loopback on the Source Optical Port

Create the XC Loopback on the Source-Node Optical Port

Connect an optical test set to the optical port you are testing:
Step 1
Note
a.
b.
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 2
Use CTC to put the circuit being tested out of service:
Step 3
a.
b.
c.
d.
e.
f.
Use CTC to set up the XC loopback on the circuit being tested:
Step 4
a.
b.
c.
d.
e.
Step 5 Complete the

Test and Clear the XC Loopback Circuit

Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic received by the test set. Look for errors or any other signal information that the
test set is capable of indicating.
Step 3 If the test set indicates a good circuit, no further testing is necessary with the cross-connect. Clear the
XC loopback:
a.
b.
c.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-14
For specific procedures to use the test set equipment, consult the manufacturer.
If you just completed the "1.2.2 Perform a Terminal Loopback on a Source-Node Optical Port"
procedure on page 1-10, leave the optical test set hooked up to the source-node port.
If you are starting the current procedure without the optical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. The Tx and Rx terminals connect to the same port.
In node view, click the Circuits tab.
Click the circuit and then click Edit.
In the Edit Circuit dialog box, click the State tab.
Choose Locked,maintenance from the Target Circuit Admin State drop-down list.
Click Apply.
Click Yes in the confirmation dialog box.
In node view, double-click the STM-N card to display the card view.
Click the Maintenance > Loopback > VC3 or VC4 tabs (or Maintenance > Optical >
Loopback > VC3 or VC4 tabs).
Click the check box in the XC Loopback column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
"Test and Clear the XC Loopback Circuit" procedure on page
In card view, click the Maintenance > Loopback > VC3 or VC4 tabs (or Maintenance > Optical >
Loopback > VC3 or VC4 tabs).
Uncheck the check box in the XC Loopback column for the circuit being tested.
Click Apply.
Chapter 1 General Troubleshooting
1-14.
July 2010