Cisco ONS 15454 Troubleshooting Manual page 54

1.5.6 Perform a Facility (Line) Loopback on a Destination-Node OC-N, G-Series, MXP, or TXP Port
1.5.6 Perform a Facility (Line) Loopback on a Destination-Node OC-N, G-Series,
MXP, or TXP Port
You perform a facility (line) loopback test at the destination port to determine whether this local port is
the source of circuit trouble. The example in
an OC-N port, but you can also use this procedure on G-Series, MXP, or TXP cards.
Figure 1-26 Facility (Line) Loopback on a Destination Node OC-N Port
Source
ONS Node
OC-N
Test Set
Caution Performing a loopback on an in-service circuit is service-affecting.
Create the Facility (Line) Loopback on a Destination Node OC-N, G-Series, MXP, or TXP Port
Note This procedure does not apply to Software R4.6 E-Series Ethernet, ML-Series Ethernet, and DWDM
cards.
Step 1 Connect an optical test set to the port you are testing:
Note
a.
b.
c.
Use CTC to set up the hairpin circuit on the test port:
Step 2
a.
b.
c.
d.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1-54
XC OC-N
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the "Create a Terminal Loopback on Intermediate-Node OC-N, G-Series,
MXP, or TXP Ports" procedure on page
port.
If you are starting the current procedure without the optical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. Both Tx and Rx connect to the same port.
Adjust the test set accordingly.
In node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type and size, such as an STS-1.
Click Next.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
"OCn1toOCn5."
Figure 1-26 shows a facility loopback being performed on
Intermediate
ONS Node
OC-N XC OC-N
1-51, leave the optical test set hooked up to the source node
Chapter 1 General Troubleshooting
Destination
ONS Node
OC-N XC OC-N
November 2004