Cisco ONS 15454 Troubleshooting Manual page 67

Chapter 1 General Troubleshooting
ONS 15454 DS-3 terminal loopbacks do not transmit an AIS in the direction away from the loopback.
Note
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 upon your card type, complete the
DS3N-12, DS3i-N-12, or EC1 Port" procedure on page 1-23
Destination DS-3E or DS3XM Port" procedure on page
instructed.
Create the Terminal Loopback on a Destination DS-3, DS3N-12, DS3i-N-12, or EC1 Port
Connect an electrical test set to the port you are testing:
Step 1
a.
b.
Step 2 Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3 In CTC node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type, such as STS, and number, such as 1.
Step 4
Click Next
Step 5
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as DS1toDS2.
Step 6
Leave the Bidirectional check box checked.
Step 7
Click Next.
Step 8
In the Circuit Creation source dialog box, select the Node, card Slot, Port, and STS (or VT) where the
Step 9
test set is connected.
Click Next.
Step 10
In the Circuit Creation destination dialog box, use the same Node, card Slot, Port, and STS (or VT) used
Step 11
for the source dialog box.
Click Next.
Step 12
In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish.
Step 13
Confirm that the newly created circuit appears in the Dir column as a two-way circuit.
Step 14
Note
ONS 15454 DS-3 terminal loopbacks do not transmit an AIS in the direction away from the loopback.
Note
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.
November 2009
If you just completed the "1.2.3 Perform an XC Loopback on a Destination-Node OC-N STS (West
to East) Carrying an Electrical Signal" procedure on page
up to the source-node port.
If you are starting the current procedure without the electrical test set hooked up to the electrical
port, use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the DSx
panel or the EIA connectors for the port you are testing. Both Tx and Rx connect to the same port.
It is normal for the "LPBKTERMINAL (DS1, DS3)" condition on page 2-174
a loopback setup. The condition clears when you remove the loopback.
1.2.4 Perform a Terminal Loopback on a Destination Electrical Port (West to East)
"Create the Terminal Loopback on a Destination DS-3,
1-25. Then test and clear the loopback as
Cisco ONS 15454 Troubleshooting Guide, R8.5
or the"Create the Terminal Loopback on a
1-18, leave the electrical test set hooked
to appear during
1-23