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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.4 Perform a Terminal (Inward) Loopback on Intermediate-Node MXP/TXP/FC_MR Ports
Figure 1-37 Terminal Loopback on an Intermediate-Node MXP/TXP/FC_MR Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Complete the “Create a Terminal Loopback on Intermediate-Node MXP/TXP/FC_MR Ports” procedure
on page 1-89.
Create a Terminal Loopback on Intermediate-Node MXP/TXP/FC_MR Ports
Step 1 Connect an optical test set to the port you are testing:
Note Refer to the manufacturer’s instructions for detailed information about connection and setup of
the optical test set.
a. If you just completed the “1.5.3 Perform a Facility (Line) Loopback on an Intermediate-Node
MXP/TXP/FC_MR Port” procedure on page 1-86, leave the optical test set hooked up to the
source-node port.
b. 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. Both Tx and Rx connect to the same port.
Step 2 Adjust the test set accordingly.
Step 3 Create the terminal loopback on the destination port being tested:
a. Go to the node view of the intermediate node:
• Choose View > Go To Other Node from the menu bar.
• Choose the node from the drop-down list in the Select Node dialog box and click OK.
b. In node view, double-click the card that requires the loopback.
c. Click the Maintenance > Loopback tab.
d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row
appropriate for the desired port.
e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
f. Click Apply.
g. Click Yes in the confirmation dialog box.
Destination
ONS Node
MXP TXP
Source
ONS Node
Intermediate
ONS Node
TXP
Test Set
MXP TXP MXP
115791
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