1-14
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.2.3 Create a Facility Loopback on an Intermediate-Node MXP or TXP Port
Figure 1-5 Facility Loopback on an Intermediate-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 a Facility Loopback on an Intermediate-Node MXP or TXP Port” procedure on
page 1-14.
Create a Facility Loopback on an Intermediate-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 “1.2.2 Perform a Terminal Loopback on a Source-Node MXP or TXP
Port” procedure on page 1-10, 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
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 In node view (single-shelf mode) or shelf view (multishelf mode), double-click the intermediate-node card
that requires the loopback.
Step 4 Click the Maintenance > Loopback tabs.
Step 5 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.
Step 6 Select Facility (Line) from the Loopback Type column. If this is a multiport card, select the row
appropriate for the desired port.
Step 7 Click Apply.
Step 8 Click Ye s in the confirmation dialog box.
Destination
ONS Node
TXPTXP
Source
ONS Node
Intermediate
ONS Node
TXPTXP
Te st Set
TXPTXP
145756
Regenerate
Tr unk port
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