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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.4.5 Perform a Facility (Line) Loopback on a Destination-Node Ethernet 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 Use CTC to set up the hairpin circuit on the test port:
a. In node view, click the Circuits tab and click Create.
b. In the Circuit Creation dialog box, choose the type, such as VC_HO, and number, such as 1.
c. Click Next.
d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
G1K1toG1K5.
e. Leave the Bidirectional check box checked.
f. Click Next.
g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the
test set is connected.
h. Click Next.
i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for
the source dialog box.
j. Click Next.
k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.
Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Note It is normal for a “LPBKFACILITY (G1000)” condition on page 2-169 to appear during a
loopback setup. The condition clears when you remove the loopback.
Step 5 Create the facility (line) loopback on the destination port being tested:
a. Go to the node view of the destination 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 Facility (Line) 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 6 Complete the “Test and Clear the Ethernet Facility (Line) Loopback Circuit” procedure on page 1-76.
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