4-10
Cisco VISM Installation and Configuration Guide
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter4 Configuring VISM Features
Configuring VISM Features
•3 = G.711u, G.711a, G.726-16k, G.726-24k, G.726-32k, G.726-40k, G.729a, and G.729ab codec s
and clear channel
Note Codec template number 3 = template number 1 with T.38 support added. Maximum
channels = 120.
•4 = G.711u, G.711a, G. 726-16k, G.726-24k, G.726-32k, G.726-40k , G.729a, G.729ab, G.723.1-H,
G.723.1a-H, G.723.1-L, G.723.1a-L codecs and clear channel
Note Template 4 supports a maximum of 64 channels for VISM, and a maximum of 1 44
channels for VISM-PR. The G.723.1 codecs are not supported for the VISM card.
You have completed allocating resources to your VISM card. Proceed to the “Configuring Connection
Admission Control” section on page 4-10.
Configuring Connection Admission Control
Complete the following steps, which allow you to:
•Enable or disable CAC.
•Define CAC parameters.
•Configure voiceband data policies for fax/modem carrier loss and fax/m odem CAC failure events.
Step 1 Type the cnfcac command, a cac-enable argument value, and press Enter to enable or disable CAC on
your VISM card. Specify the argument with one of the following values:
•1 = On
•2 = Off
Note If your application does not require CAC, specify the cac-enable argument as value 2 in Step
1 and proceed to the “Placing the VISM Card In Service” section on page4-11.
Step 2 Type the cnfcacparams command, vad-duty-cycle and vad-tol argument values, and press Enter to
configure card level CAC parameter values for VAD tolerance and duty cycle, which are used in CAC
algorithms. Specify the arguments with the following values:
•vad-duty-cycle: In the range from 1 to 99 (default = 61)
•vad-tol: In the range from 0 to 10000 (default = 100)
Step 3 Type the cnfconcacparams command, lcn, vad-tol, and vad-duty-cycle argument values, and press
Enter to configure values for VAD tolerance and duty cycle, which are used in the CAC algorithms, for
a specified logical connection number (PVC). Specify the arguments with the following values:
•lcn: In the range from 131 to 510
•vad-tol: In the range from 1 to 10000 (default = 100)
•vad-duty-cycle: In the range from 1 to 99 (default = 61)