Figure 1-15 Facility Loopback On A Circuit Destination Ds-N Port - Cisco ONS 15454 Troubleshooting Manual

1.2.5 Perform a Facility Loopback on a Destination-Node Electrical Port (East to West)
Figure 1-15 Facility Loopback on a Circuit Destination DS-N Port
ONS Node
DS-N
Test Set
Performing a loopback on an in-service circuit is service-affecting. To protect traffic, apply a lockout or
Caution
Force switch to the target loopback port. For basic instructions, refer to the
Lock Initiation, and Clearing" section on page
to the "Maintain the Node" chapter in the Cisco ONS 15454 Procedure Guide.
Facility loopbacks require on-site personnel.
Note
Note ONS 15454 DS-3 terminal loopbacks do not transmit an AIS in the direction away from the loopback.
Instead of AIS, a continuance of the signal transmitted into the loopback is provided. A DS3/EC1-48
card can be provisioned to transmit AIS for a terminal loopback if desired.
Depending on your card type, complete the
DS-3, DS3N-12, DS3i-N-12, or EC-1 Port" procedure on page 1-28
on the Source DS3E or DS3XM Port" procedure on page
instructed.
Create the Facility Loopback on the Destination DS-1, DS-3, DS3N-12, DS3i-N-12, or EC-1 Port
Step 1 Connect an electrical test set to the port you are testing:
a.
b.
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 2
In CTC node view, double-click the card to open the card view.
Step 3
Click the Maintenance > Loopback tabs.
Step 4
Choose OOS,MT from the Admin State column for the port being tested. If this is a multiport card,
Step 5
select the appropriate row for the port being tested.
Choose Facility from the Loopback Type column for the port being tested. If this is a multiport card,
Step 6
select the appropriate row for the port being tested.
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-28
Source
XC OC-N
If you just completed the
(West to East)" procedure on page
destination-node port.
Use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the EIA
connectors or DSx panel for the port you are testing. The Tx and Rx terminals connect to the same
port.
Intermediate
ONS Node
DS-N XC OC-N
2-262. For more information about these operations, refer
"Create the Facility Loopback on the Destination DS-1,
"1.2.4 Perform a Terminal Loopback on a Destination Electrical Port
1-22, leave the electrical test set hooked up to the
Chapter 1 General Troubleshooting
Destination
ONS Node
DS-N XC
"2.9.2 Protection Switching,
or the "Create the Facility Loopback
1-29. Then test and clear the loopback as
OC-N
November 2009