Cisco 15310-MA Guia de Resolução de Problemas descarregar pdf (Página 49)

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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

1.2.5 Perform a Hairpin Test on a Destination-Node Port

The hairpin test is performed on the port in the destination node. To perform this test, you must also

create a bidirectional circuit in the transmit direction from the destination ONS 15310-CL or

ONS 15310-MA to the source node. Creating the bidirectional circuit and completing a successful

hairpin eliminates the possibility that the source port, destination port, or fiber span is responsible for

the faulty circuit.

Create the Hairpin Loopback Circuit on the Destination-Node Port

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

Use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the electrical cabling

panel for the port you are testing.

Step 2 Adjust the test set accordingly.

Step 3 Use CTC to set up the source loopback circuit on the port being tested:

a. Click the Circuits tab and click Create.

b. Give the circuit an easily identifiable name, such as Hairpin1.

c. Set the circuit Type and Size to the normal preferences, such as STS and STS1.

d. Leave the Bidirectional check box checked and click Next.

e. In the Circuit Source dialog box, fill in the source Node, Slot, Port, and Type where the test set is

connected and click Next.

f. In the Circuit Destination dialog box, fill in the destination Node, Slot, Port, and Type (the port in

the destination node) and click Finish.

Step 4 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.

Step 5 Use CTC to set up the destination hairpin circuit on the port being tested.

Note The destination loopback circuit on a port is a one-way test.

For example, in a typical east-to-west slot configuration, a DS-3 port on the source node is one end of

the fiber span, and a DS-3 port on the destination node is the other end.

a. Click the Circuits tab and click Create.

b. Give the circuit an easily identifiable name, such as Hairpin1.

c. Set the Circuit Type and Size to the normal preferences, such as STS and STS1.

d. Uncheck the Bidirectional check box and click Next.

e. In the Circuit Source dialog box, select the same Node, Slot, Port, and Type where the previous

circuit is connected and click Next.

f. In the Circuit Destination dialog box, use the same Node, Slot, Port, and Type used for the Circuit

Source dialog box and click Finish.

Step 6 Confirm that the newly created circuit appears on the Circuits tab list as a one-way circuit.

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Cisco 15310-MA Guia de Resolução de Problemas Página 49