1-22
Cisco ONS 15454 DWDM Troubleshooting Guide, R7.0.1
78-17742-02
Chapter 1 General Troubleshooting
1.2.6 Perform a Terminal Loopback on a Destination-Node MXP or TXP Port
Create the Terminal 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 “1.2.5 Perform a Facility Loopback on a Destination-Node MXP or TXP
Port” procedure on page 1-18, leave the optical test set hooked up to the source 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.)
Note It is normal for the “LPBKTERMINAL (ESCON)” condition on page 2-97, “LPBKTERMINAL
(FC)” condition on page 2-98, “LPBKTERMINAL (GE)” condition on page 2-98,
“LPBKTERMINAL (ISC)” condition on page 2-99 or the “LPBKTERMINAL (TRUNK)”
condition on page 2-99 to appear during loopback setup. The condition clears when you remove
the loopback.
Step 3 Create the terminal 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.
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.
Step 4 Complete the “Test and Clear the MXP or TXP Terminal Loopback Circuit” procedure on page 1-22.
Test and Clear the MXP or TXP Terminal Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information
that the test set is capable of indicating.
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