Cisco 15310-MA Průvodce řešením problémů stáhnout pdf (Strana 46)

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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

DS1 Inhibit FEAC Backplane Loopback

DS1 ports initiate loopbacks when they receive FEAC loop codes. If the Inhibit FE Backplane Lbk check

box is checked for a DS1 port, that port ignores any FEAC loop codes it receives and will not loop back

(return them).

Create the NIU Loopback on a Destination-Node DS1 Port

Step 1 Connect a test set to the near end DS1 port.

Note For specific procedures to connect, set up, and use the test set equipment, consult the

manufacturer.

If you are starting the current procedure without the test set hooked up to the source port, use appropriate

cabling to attach the Tx and Rx terminals of the test set to the port you are testing. Both Tx and Rx

connect to the same port.

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

Step 3 Use CTC to set up the terminal loopback 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 VT, 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

C1C1toC1C6.

e. Leave the Bidirectional check box checked.

f. Click Next.

g. In the Circuit Creation source dialog box, select the same Node, card Slot, Port, and DS1 where the

test set is connected as shown in Figure 1-2.

h. Click Next.

i. In the Circuit Creation destination dialog box, select the Node, card Slot, Port, and DS1 connected

to CPE as shown in Figure 1-2.

j. Click Next.

k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.

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

Step 5 Create NIU Loopback on the destination port being tested:

a. Go to the card view of the destination node:

b. Click the Maintenance > DS1 > Loopback tabs.

c. Uncheck the Inhibit FE Backplane Lbk checkbox for port being tested.

Note The Inhibit FE Backplane Lbk checkbox is always checked by default.

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