Cisco Cisco IOS Software Release 12.2(8)T

The following commands can be used to configure the Cisco 3660 only when there is a TDM switch 
module on board. For the Cisco 2600 series routers, these commands are automatically allowed.

When verifying your ATM PVC connectivity, note that you cannot enter the ping command over a 
voice PVC, because the command applies to data only. If you have data and voice PVCs set to the 
same destination, you can enter the ping command over the data PVC.

This section describes the configuration tasks necessary to configure call admission control (CAC) for 
AAL2 voice. The commands and procedures in this section are common to the Cisco 2600 series and the 
Cisco 3660 routers.

You can configure a Cisco 2600 series router or a Cisco 3660 as either a CAC master or a CAC slave. 
By default, this is a CAC slave. You typically configure a CAC master at one end of an ATM trunk and 
a CAC slave at the opposite end. A Cisco 2600 series router or a Cisco 3660 configured as a master 
always performs CAC during fax/modem upspeed. A Cisco 2600 series router or a Cisco 3660 
configured as a slave sends a request for CAC to the CAC master.

To configure a Cisco 2600 series router or a Cisco 3660 as a CAC master, complete the following steps 
beginning in global configuration mode:

Router(config)# network-clock-participate {nm | 

} slot

Enables the Cisco 2600 series router or the Cisco 3660 to 
receive clock signals from the VWIC by entering the 
keyword wic and the slot number 0 on the router. 

for Cisco 2600 series:

Router(config)# network-clock-participate {nm | 

} slot

for Cisco 3660:

Router(config)# network-clock-participate nm 

Enables the Cisco 2600 series router or the Cisco 3660 to 
receive clock signals from the network module by entering 
the keyword nm and the slot number 1 on the router. 

Router(config)network-clock-select priority t1 

Names a source to provide timing for the network clock 
and to specify the selection priority for this clock source. 
The priority selection is 1 or 2. 

Use the no form of this command to cancel the selection.

Router(config)network-clock-select priority t1 

Assigns priority 1 to ATM interface 0/0 and priority 2 to 
controller 1/0.

Router(config)voice-card slot

Enters voice-card configuration mode and sets codec 
complexity. For slot, use a value from 0 to 3 that describes 
the card location in the module.