Cisco ONS 15454 Troubleshooting Manual page 74
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1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port (East to West)
Step 4
For the DS3 tab, choose OOS,MT from the Admin State column for the port being tested. If this is a
multiport card, select the appropriate row for the port being tested. For the DS1 tab, no state selection is
necessary unless the DS-1 is in service. The loopback/send code cannot be selected for a DS-1 if the
derived state is OOS,DSBLD.
Step 5
Choose Facility from the Loopback Type column for the port being tested. If this is a multiport card,
select the appropriate row for the port being tested.
Click Apply.
Step 6
Step 7
Click Yes in the confirmation dialog box.
Note
Complete the
Step 8
page
Test and Clear the DS3E or DS3XM Port Facility Loopback Circuit
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Examine the traffic received by the test set. Look for errors or any other signal information that the test
Step 2
set is capable of indicating.
Step 3
If the test set indicates a good circuit, no further testing is necessary with the facility loopback.
Double-click the card to open the card view.
Step 4
For any of these cards, click the Maintenance > DS3 tabs.
Note
Choose None from the Loopback Type column for the port being tested.
Step 5
Step 6
Choose the appropriate state (IS; OOS,DSBLD; OOS,MT; IS,AINS) from the Admin State column for
the port being tested.
Click Apply.
Step 7
Click Yes in the confirmation dialog box.
Step 8
Step 9
Complete the
Test the Electrical Cabling
Replace the suspected bad cabling (from the test set to the DSx panel or the EIA ports) with known-good
Step 1
cable. For instructions, refer to the "Install Cards and Fiber-Optic Cable" chapter in the
Cisco ONS 15454 Procedure Guide.
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-30
It is normal for the
"LPBKFACILITY (DS1, DS3)" condition on page 2-169
loopback setup. The condition clears when you remove the loopback.
"Test and Clear the DS3E or DS3XM Port Facility Loopback Circuit" procedure on
1-30.
The DS-3 Admin State is the basis of the DS-1 Derived State.
"Test the Electrical Cabling" procedure on page
Chapter 1
General Troubleshooting
to appear during
1-30.
November 2009
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