Cisco 15310-MA Průvodce řešením problémů stáhnout pdf (Strana 52)

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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 OC-N Circuit Path

Test the Electrical Cabling

Step 1 Replace the suspect cabling (the cables from the test set to the DS-1, DS-3, or EC-1 port) with a cable

known to be good.

If a cable known to be good is not available, test the suspect cable with a test set. Remove the suspect

cable from the electrical port and connect the cable to the Tx and Rx terminals of the test set. Run traffic

to determine whether the cable is good or suspect.

Step 2 Resend test traffic on the loopback circuit with a good cable installed.

Step 3 If the test set indicates a good circuit, the problem is probably the defective cable. Replace the defective

cable.

Step 4 Clear the facility loopback:

a. Double-click the card and then click the appropriate tab:

• Maintenance > DS1 > Loopback

• Maintenance > DS3 > Loopback

• Maintenance > EC1 > Loopback

b. Choose None from the Loopback Type column for the port being tested.

c. Choose the appropriate state (IS,AINS; OOS,DSBLD; or OOS,MT) from the Admin State column

for the port being tested.

d. Click Apply.

e. Click Yes in the confirmation dialog box.

The entire DS-N circuit path has now passed its comprehensive series of loopback tests. This circuit

qualifies to carry live traffic.

1.3 Identify Points of Failure on an OC-N Circuit Path

Using facility loopbacks, terminal loopbacks, and cross-connect loopback circuits, you can test OC-N

facilities or STSs on the ONS 15310-CL or ONS 15310-MA to logically isolate faults. For this purpose,

you perform a loopback test at each point along the circuit path to systematically isolate a point of

failure.

The example in this section tests an OC-N circuit on a three-node path protection configuration. Using

a series of facility loopbacks and terminal loopbacks, the path of the circuit is traced and the possible

points of failure are tested and eliminated. A logical progression of seven network test procedures

applies to this sample scenario:

1. Facility loopback on the source-node OC-N port

2. Cross-connect loopback on the source-node OC-N port

3. Terminal loopback on the source-node OC-N port

4. Facility loopback on the intermediate-node OC-N port

5. Terminal loopback on the intermediate-node OC-N port

6. Facility loopback on the destination-node OC-N port

7. Terminal loopback on the destination-node OC-N port

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Cisco 15310-MA Průvodce řešením problémů Strana 52