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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.7.3 Bidirectional Diagnostic Circuit
Note The diagnostic VT circuit does not raise a failure alarm if AIS-P or UNEQ-P is returned to the PRBS
detector. In order to see an alarm indicating a failed diagnostic circuit, the circuit must be returned to the
PRBS detector with a different payload than the generator sources and without the AIS-P or UNEQ-P
conditions.
Create a Bidirectional Diagnostic Circuit
Step 1 Log into the node where you will create the diagnostic circuit. (For login instructions, refer to the
“Connect the PC and Log into the GUI” chapter in the Cisco ONS 15454 Procedure Guide.)
Step 2 If you want to assign a name to the circuit source and destination ports before you create the circuit, refer
to the task for assigning a name to a port in the “Create Circuits and VT Tunnels” chapter of the
Cisco ONS 15454 Procedure Guide. If not, continue with Step 3.
Step 3 From the View menu, choose Go to Network View.
Step 4 Click the Circuits tab, then click Create.
Step 5 In the Circuit Creation dialog box, complete the following fields:
• Circuit Type—Choose VT.
• Number of Circuits—Enter 1 (the maximum diagnostic circuit quantity available per STS).
• Auto-ranged—Uncheck the box. (This option is not applicable to diagnostic circuits.)
Step 6 Click Next.
Step 7 Define the circuit attributes in the Circuit Creation Dialog Box (Figure 1-46) using the following
parameters:
Figure 1-46 Network View Circuit Creation Dialog Box
•
Name—Assign a name to the circuit. The name can be alphanumeric and up to 48 characters,
(including spaces). Circuit names should be 44 characters or less if you want the ability to create
monitor circuits. If you leave the field blank, CTC assigns a default name to the circuit.
• Size—VT1.5 is the default. You cannot change it.
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