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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.4.3 Perform an XC Loopback on the Source Optical Port
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 Clear the terminal loopback circuit before testing the next segment of the network circuit path:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 7 Complete the “1.4.3 Perform an XC Loopback on the Source Optical Port” procedure on page 1-53.
1.4.3 Perform an XC Loopback on the Source Optical Port
Note This procedure is only performed on OC-N cards and tests the cross-connect circuit connection.
Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1
protection group.
Note XC loopbacks do not require on-site personnel.
The XC loopback test occurs on the cross-connect card in a network circuit. Completing a successful XC
loopback from an OC-N card through the cross-connect card eliminates the cross-connect card as the
source of trouble for a faulty circuit. Figure 1-24 shows an example of an XC loopback path on a source
OC-N port.
Figure 1-24 XC Loopback on a Source OC-N Port
Complete the “Create the XC Loopback on the Source-Node Optical Port” procedure on page 1-53.
Create the XC Loopback on the Source-Node Optical Port
Step 1 Connect an optical test set to the port you are testing:
XC
Te s t Se t
OC-Ny
OC-Nx
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