This Recommendation specifies the ATM Adaptation Layer (AAL) type 2. The AAL type 2 provides for the bandwidth-efficient transmission of low-rate, short, and variable length packets in delay sensitive applications. More than one AAL type 2 user information stream can be supported on a single ATM connection. In this Recommendation, the general framework and the Common Part Sublayer (CPS) of the AAL type 2 are defined in depth.