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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.4 Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)
b. If you are starting the current procedure without the electrical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the electrical
connection panel or the FMEC card connectors for the port you are testing. Both Tx and Rx connect
to the same port.
Step 2 Adjust the test set accordingly.
Step 3 In CTC node view, click the Circuits tab and click Create.
Step 4 In the Circuit Creation dialog box, choose the type and size, such as such as VC HO Path Circuit, and
number, such as 1.
Step 5 Click Next.
Step 6 In the next Circuit Creation dialog box, give the circuit an easily identifiable name, such as ENtoEN.
Step 7 Leave the Bidirectional check box checked. Leave the default value for State.
Step 8 Click Next.
Step 9 In the Circuit Creation source dialog box, select the Node, Slot, Port, and VC4 where the test set is
connected.
Step 10 Click Next.
Step 11 In the Circuit Creation destination dialog box, fill in the same Node, Slot, Port, and VC4 (the
destination-node port) and click Finish.
Step 12 Confirm that the newly created circuit appears in the Circuits tab Dir column as a two-way circuit.
Note It is normal for a “LPBKTERMINAL (DS3)” condition, page 2-171 to appear during a loopback
setup. The condition clears when you remove the loopback.
Note Electrical circuit terminal loopbacks do not transmit an AIS (see the “AIS” condition on
page 2-30) in the direction away from the loopback. Instead of an AIS, a continuance of the
signal transmitted to the loopback is provided.
Step 13 Create the terminal (inward) 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, such as an E-1 card in the destination
node.
c. Click the Maintenance > Loopback tabs.
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.
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