Cisco Cisco ONS 15600 SDH, Troubleshooting Manual

Page: 74 / 318

1-42
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.3.5 Perform a Facility Loopback on a Destination-Node Ethernet Port
Caution
Performing a loopback on an in-service circuit is service-affecting.
Note
Facility loopbacks require on-site personnel.
Complete the “Create the Facility Loopback on a Destination-Node Ethernet Port” procedure on
page 1-42 .
Create the Facility Loopback on a Destination-Node Ethernet Port
Step 1 Connect an optical test set to the destination ASAP card optical port you are testing. If you are starting
the current procedure without the optical test set hooked up to the source optical 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 For specific procedures to use the test set equipment, consult the manufacturer.
Step 2 Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3
Use CTC to set up the hairpin circuit on the test port:
a. In node view, click the Circuits tab and click Create .
b.
In the Circuit Creation dialog box, choose the type, such as VC_HO_PATH_CIRCUIT, and circuit
number, such as 1.
c. Click Next .
d.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
Eth1toEth5.
e. Leave the Bidirectional check box checked.
f.
Click Next .
g. In the Circuit Creation source dialog box, select the same Node, card Slot, Port, and VC where the
test set is connected.
h.
Click Next .
i. In the Circuit Creation destination dialog box, use the same Node, card Slot, Port, and VC used for
the source dialog box.
j.
Click Next .
k. In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click Finish .
Step 4
Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Note
It is normal for the “LPBKFACILITY (GIGE)” condition on page 2-88 to appear during a
loopback setup. The condition clears when you remove the loopback.
Step 5
Create the facility loopback on the destination port being tested:
a. Go to the node view of the destination node: