1-19
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.2.5 Perform a Facility Loopback on a Destination-Node MXP or TXP Port
Figure 1-7 Facility Loopback on a Destination-Node MXP or TXP Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Facility loopbacks require on-site personnel.
Complete the “Create the Facility Loopback on a Destination-Node MXP or TXP Port” procedure on
page 1-19.
Create the Facility Loopback on a Destination-Node MXP or TXP Port
Step 1 Connect an optical test set to the port you are testing:
Note For specific procedures to connect, set up, and use the test set equipment, consult the
manufacturer.
a. If you just completed the “1.2.4 Create a Terminal Loopback on Intermediate-Node MXP or TXP
Ports” procedure on page 1-16, 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. (Refer to manufacturer instructions for test set use.)
Step 3 Create the facility loopback on the destination port being tested:
a. Go to the node view (single-shelf mode) or shelf view (multishelf mode) of the destination node:
• Choose View > Go To Other Node from the menu bar.
• Choose the node (or shelf) from the drop-down list in the Select Node dialog box and click OK.
b. In node view (single-shelf mode) or shelf view (multishelf mode), double-click the card that requires
the loopback.
c. Click the Maintenance > Loopback tabs.
d. Select OOS,MT (or locked,maintenance) from the Admin State column. If this is a multiport card,
select the row appropriate for the desired port.
TXP
Destination
ONS Node
TXP
Source
ONS Node
Intermediate
ONS Node
TXP TXPTXP
145755
Regenerate
TXP
Te st Set
Tr unk port
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