Perform A Facility Loopback Or Payload Loopback On A Destination-Node Optical Port; Create The Facility Loopback Or Payload Loopback On A Destination-Node Optical Port; Figure 1-12 Facility Loopback Path To A Destination-Node Stm-N Port - Cisco ONS 15600 SDH Troubleshooting Manual

Chapter 1 General Troubleshooting
1.2.6 Perform a Facility Loopback or Payload Loopback on a Destination-Node
Optical Port
You perform a facility loopback test at the destination port to determine whether this local port is the
source of circuit trouble. The example in
destination-node STM-N port.
Figure 1-12 Facility Loopback Path to a Destination-Node STM-N Port
Source
ONS Node
STM-N
Test Set
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Facility loopbacks require on-site personnel.
Complete the
procedure on page

Create the Facility Loopback or Payload Loopback on a Destination-Node Optical Port

Connect an optical test set to the STM-N or ASAP optical port you are testing. If you are starting the
Step 1
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.
Note
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 2
Use CTC to set up the facility circuit on the test port:
Step 3
a.
b.
c.
d.
e.
July 2010

1.2.6 Perform a Facility Loopback or Payload Loopback on a Destination-Node Optical Port

XC STM-N
"Create the Facility Loopback or Payload Loopback on a Destination-Node Optical Port"
1-23.
For specific procedures to use the test set equipment, consult the manufacturer.
In node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type, such as VC_HO_PATH_CIRCUIT, and circuit
number, such as 1.
Click Next.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
Opt1toOpt5.
Leave the Bidirectional check box checked.
Figure 1-12 shows a facility loopback being performed on a
Intermediate
ONS Node
STM-N XC STM-N
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
Destination
ONS Node
STM-N XC STM-N
1-23