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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.3.3 Perform an XC Loopback on the Source Optical Port
f. Click Yes in the confirmation dialog box.
Step 6 Clear the terminal loopback circuit:
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 “1.3.3 Perform an XC Loopback on the Source Optical Port” procedure on page 1-45.
1.3.3 Perform an XC Loopback on the Source Optical Port
Note This procedure is only performed on STM-N cards and XC cards.
Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1
protection group.
The cross-connect (XC) loopback test occurs on the XC-VXL cross-connect card in a network circuit.
Completing a successful XC loopback from an optical card through the cross-connect card eliminates
the cross-connect card as the source of trouble for a faulty circuit. Figure 1-22 shows an example of an
XC loopback path on a source STM-N port.
Figure 1-22 XC Loopback on a Source STM-N Port
Complete the “Create the XC Loopback on the Source STM-N Port” procedure on page 1-45.
Create the XC Loopback on the Source STM-N Port
Step 1 Connect an optical test set to the port you are testing:
Note Refer to the manufacturer’s instructions for detailed information on connection and setup of the
optical test set.
a. If you just completed the “1.3.2 Perform a Terminal (Inward) Loopback on a Source-Node Optical
Port” procedure on page 1-42, leave the optical test set hooked up to the source-node port.
XC
Test Set
STM-Ny
STM-Nx
90601
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