Cisco ONS 15454 SDH - Test and Clear the Electrical Port Terminal (Inward) Loopback Circuit

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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.8 Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)
Step 11 In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for the
source dialog box.
Step 12 Click Next and complete the following substeps:
a. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.
b. In the VC Optimization dialog box, leave all defaults.
c. Click Finish.
Step 13 Confirm that the newly created circuit appears in the Dir column as a two-way circuit.
Note It is normal for a “LPBKTERMINAL (DS3)” condition on 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 a, electrical line AIS, a
continuance of the signal transmitted to the loopback is provided.
Step 14 Create the terminal (inward) loopback on the destination port being tested:
a. Go to the node view of the destination node:
• From the View menu choose Go To Other Node.
• 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 the electrical 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.
Step 15 Complete the “Test and Clear the Electrical Port Terminal (Inward) Loopback Circuit” procedure on
page 1-37.
Test and Clear the Electrical Port Terminal (Inward) 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.
Step 3 If the test set indicates a good circuit, no further testing is necessary on the loopback circuit.
Double-click the electrical card in the destination node with the terminal loopback.
Step 4 Click the Maintenance > Loopback tabs.