Test And Clear The Terminal Loopback Circuit - Cisco ONS 15454 Troubleshooting Manual

1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node OC-N, G-Series, MXP, or TXP Port
Use CTC to set up the terminal (inward) loopback on the test port:
Step 2
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
Confirm that the newly created circuit appears on the Circuits tab list as a 2-way circuit.
Step 3
Note
Create the terminal (inward) loopback on the destination port being tested:
Step 4
a.
b.
c.
d.
e.
f.
Complete the
Step 5

Test and Clear the Terminal Loopback Circuit

This procedure does not apply to Software R4.6 E-Series Ethernet, ML-Series Ethernet, and DWDM
Note
cards.
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Examine the test traffic being received by the test set. Look for errors or any other signal information
Step 2
that the test set is capable of indicating.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1-42
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
"OCn1toOCN2."
Leave the Bidirectional check box checked.
Click Next.
In the Circuit Creation source dialog box, select the same Node, card Slot, Port, and STS (or VT)
where the test set is connected.
Click Next.
In the Circuit Creation destination dialog box, use the same Node, card Slot, Port, and STS (or VT)
used for the source dialog box.
Click Finish.
It is normal for the "LPBKTERMINAL (DS1, DS3, EC-1-12, OCN)" condition on page 2-144
to appear during a loopback setup. The condition clears when you remove the loopback.
In node view, double-click the card that requires the loopback, such as the destination OC-N card in
the source node.
Click the Maintenance > Loopback tabs.
Select OOS_MT from the State column. If this is a multiport card, select the row appropriate for
the desired port.
Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
Click Apply.
Click Yes in the confirmation dialog box.
"Test and Clear the Terminal Loopback Circuit" procedure on page
Chapter 1 General Troubleshooting
1-42.
November 2004