для Cisco Cisco IOS Software Release 12.2(8)T

T1/E1 ATM support is a time-to-market feature that helps service providers take advantage of the 
inherent quality of service (QoS) features of ATM multiservice applications. FR-ATM (FRF.5 and 
FRF.8) internetworking is supported on the Cisco 2600 series.

On the Cisco 3660 a T1 IMA network module is used as the IMA interface providing a maximum of one 
ATM IMA interface that supports up to 48/60 voice channels. Up to eight T1/E1s and multiple IMA 
groups are permitted, but only the first IMA group supports voice over AAL2 for up to 48/60 voice 
channels. NM-IMA already supports AAL5 on both the Cisco 2600 series and Cisco 3600 series (not just 
3660).

The Cisco 2600 Series T1/E1 ATM portion of this feature provides a shared implementation of the ATM 
features currently available on the Cisco MC3810 with the Cisco 2600 series.

 illustrates the ATM AAL2 nonswitched trunking feature connecting two private branch 

exchanges (PBXs) together without the call agent (CA).

 illustrate CA solutions. In these solutions, a CA provides business voice services 

traditionally offered by a circuit-based PBX.

In 

, the trunking gateway (the Cisco 3660 platform) requires support of incoming and outgoing 

multi-frequency signaling for the barge-in and busy-line verify features. The residential gateway (the 
Cisco uBR924 cable access router) must support the CLASS features and 911 capability.

62370

CAS

2600
3660
3810

2600
3660
3810

uBR924

2600

ATM AAL2

3660

Class 5

End Office

Business

subscriber

(PBX)

CAS

LEC B
mated STP
pair