Cisco ONS 15454 SDH Specifications download pdf (Page 90)

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3

May 2002

Chapter 2 General Troubleshooting

Identify Points of Failure on a Circuit Path

Caution Performing a loopback on an in-service circuit is service affecting.

Procedure: Create the Terminal Loopback on a Destination E3-12 Card

Step 1 Connect an electrical test set to the port you are testing:

a. If you are starting the current procedure with the electrical test set hooked up to the E3-12 card in

the source node, leave the test set hooked up.

b. If you are starting the current procedure without the electrical test set hooked up to the E3-12 card

in the source node, use appropriate cabling to attach the transmit (Tx) and receive (Rx) terminals of

the electrical test set to the DSx panel or the FMEC card connectors for the port you are testing. Both

transmit (Tx) and receive (Rx) cables connect to the same port. Set up the test set accordingly.

Step 2 Use CTC to set up the terminal loopback circuit on the port being tested.

a. Click the Circuits tab and click the Create button.

b. Give the circuit an easily identifiable name, such as E312toE312.

c. Set Circuit Type and Size to the normal preferences.

d. Leave the Bidirectional checkbox checked and click Next.

e. In the Circuit Source dialog box, fill in the same card and port where the facility loopback test (the

E3-12 card in the source node) was performed and click Next.

f. In the Circuit Destination dialog box, fill in the destination card and port (the E3-12 card in the

destination node) and click Finish.

Step 3 Confirm that the newly created circuit appears on a Circuits screen row with a direction column that

shows a two-way circuit.

Note It is normal for an alarm to appear during a loopback setup. The alarm clears when you

remove the loopback.

Step 4 Create the loopback circuit on the destination card and port being tested:

a. In node view, double-click the card that requires the loopback, such as the E3-12 card in the

destination node.

b. Click the Maintenance > Loopback tabs.

c. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the

row appropriate for the desired port.

d. Click Apply.

e. On the confirmation dialog box, click Yes.

Proceed to the “Test the Terminal Loopback Circuit on the Destination E3-12 Card” section on

page 2-11.

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Cisco ONS 15454 SDH Specifications Page 90