Cisco 15310-MA Anleitung zur Fehlerbehebung PDF herunterladen (Seite 45)

1-9

Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 1 General Troubleshooting

Identify Points of Failure on an Electrical Circuit Path

Test the Terminal Loopback Circuit on the Destination-Node Port

Step 1 If the test set is not already sending traffic, send test-set 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. Clear the

terminal loopback:

a. Double-click the 15310-CL-CTX or CTX2500 card in the destination node with the terminal

loopback.

b. Double-click the appropriate card containing the electrical circuit you are testing, and click the

appropriate tab:

• Maintenance > DS1 > Loopback

• Maintenance > DS3 > Loopback

• Maintenance > EC1 > Loopback

c. Select None from the Loopback Type column for the port being tested.

d. Select the appropriate state (IS,AINS,AINS OOS,DSBLD or OOS,MT) in the Admin State column

for the port being tested.

e. Click Apply.

f. Click Yes in the confirmation dialog box.

Step 4 Clear the terminal loopback circuit:

a. Click the Circuits tab.

b. Choose the loopback circuit being tested.

c. Click Delete.

d. Click Yes in the Delete Circuits dialog box.

Step 5 If the test set indicates a faulty circuit, the problem might be a faulty port. Continue with the

“1.2.5 Perform a Hairpin Test on a Destination-Node Port” procedure on page 1-13.

1.2.4 Perform a Network Interface Unit Loopback on a Destination-Node Port

The network interface unit (NIU) loopback test is performed on the node destination port in the circuit.

First, create a bidirectional circuit that originates on the source node electrical port (DS-1) and

terminates on the destination-node electrical port. Then continue with the NIU loopback test.

Completing a successful NIU loopback to a destination-node port verifies that the circuit is good up to

the destination port.

Note NIU loopback is applicable for ESF frame format only.

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

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Cisco 15310-MA Anleitung zur Fehlerbehebung Seite 45