Cisco Cisco IOS Software Release 12.2(8)T

See the following sections for configuration tasks for AAL2 Trunking with CAS on Cisco 2600 series 
and Cisco 3660:

 (required for Cisco 2600 series routers only)

 (required for Cisco 3660 routers only)

 (optional)

 (optional)

 (required)

 (required)

 (required)

 (required)

This section describes the ATM configuration tasks necessary to support Voice over ATM using AAL2 
on the Cisco 2600 series.

If any DS0 groups (CAS groups), channel groups, or clear channels are configured on T1/E1 
controller 0, you must remove them before configuring VoATM. Because ATM uses all of the DS0 
time slots on the controller, the ATM configuration cannot take place if any DS0s on controller 0 are 
used by other applications.

You must perform the VoATM configuration on the Cisco 2600 series or Cisco 3660 concentrators at 
both ends of the ATM link.

To configure a Cisco 2600 series or Cisco 3660 series concentrator to support VoATM on a T1/E1 trunk, 
complete the following steps beginning in global configuration mode:

Router(config)# controller {t1 | e1} 0/0

Selects the T1 or E1 controller 0/0.

Router(config-controller)# mode atm 

Specifies that the controller will support ATM 
encapsulation and create ATM interface 0/0.

Router(config-controller)# framing framing type

Specifies the T1 framing type as extended 
superframe or esf.

When the controller is set to ATM mode, the 
Controller framing is automatically set to Extended 
SuperFrame (esf) on T1 and to crc4 on E1. 

Router(config-controller)# linecode linecode type

Specifies the T1 line code type as b8zs. 

The linecode is automatically set to b8zs on T1 and 
to HDB3 on E1.

Router(config-controller)# no shutdown

Ensures that the controller is activated.