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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.2.1 Perform a Facility Loopback on a Source-Node Port
Step 3 Use CTC to create the facility loopback on the port being tested:
a. In node view, double-click the card where you are performing the loopback, then click the
appropriate tab:
• Maintenance > DS1 > Loopback
• Maintenance > DS3 > Loopback
• Maintenance > EC1 > Loopback
b. Choose OOS,MT from the Admin State column for the port being tested.
c. Choose Facility from the Loopback Type column for the port being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Note It is normal for a facility loopback 2.7.156 LPBKFACILITY (DS1, DS3) or
2.7.157 LPBKFACILITY (EC1) condition to appear during loopback setup. The condition
clears when you remove the loopback.
Step 4 Continue with the “Test the Facility Loopback” procedure on page 1-5.
Test the Facility Loopback
Step 1 If the test set is not already sending traffic, send test-set traffic on the loopback circuit.
Step 2 Examine the traffic 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, complete the following steps:
a. Double-click the electrical card, 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.
Step 4 If the test set indicates a faulty circuit, the problem might be a faulty card, faulty port, or faulty cabling
from the electrical port. Continue with the “Test the Electrical Cabling” procedure on page 1-6.