Cisco 15310-MA Průvodce řešením problémů stáhnout pdf (Strana 87)

1-51

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

78-18394-01

Chapter 1 General Troubleshooting

Troubleshooting Ethernet Circuit Paths With Loopbacks

1.6.8 Perform a Hairpin Test on a Destination-Node Ethernet Port

The hairpin test is performed on the cross-connect card in the network circuit. A hairpin circuit uses the

same port as source as well as destination. Completing a successful hairpin through the card isolates the

possibility that the cross-connect card is the cause of the faulty circuit. Figure 1-7 shows an example of

a hairpin loopback on a destination-node port.

Figure 1-7 Hairpin on a Destination-Node Ethernet Port

Note The ONS 15310-MA does not support simplex operation on the cross-connect card. Two cross-connect

cards of the same type must be installed for each node.

Note Hairpin loopbacks require on-site personnel.

Complete the “Create the Hairpin Circuit on the Destination-Node Port” procedure on page 1-51.

Create the Hairpin Circuit on the Destination-Node Port

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

a. If you just completed the “1.6.7 Perform a Terminal Loopback on a Destination-Node Ethernet

Port” procedure on page 1-48, leave the Ethernet test set hooked up to the Ethernet port in the

destination node.

b. If you are starting the current procedure without the Ethernet test set hooked up to the Ethernet port,

use appropriate cabling to connect the Ethernet test set to the port you are testing.

Step 2 Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)

Step 3 Use CTC to set up the hairpin circuit on the test port:

a. In node view, click the Circuits tab and click Create.

b. In the Circuit Creation dialog box, choose the type, such as STS, and number, such as 1.

c. Click Next.

d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as Hairpin1.

e. Choose the Size, such as STS-1.

f. Uncheck the Bidirectional check box. Leave the default values for State, SD Threshold, and

SF Threshold.

g. Click Next.

Destination

ONS Node

Source

ONS Node

280096

OC-N CE-MR-6XCOC-N

Te st Set

XCCE-MR-6

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