This Recommendation specifies the Segmentation and Reassembly Service Specific Convergence sublayer of the ATM Adaptation Layer (AAL) type 2 which provides for the bandwidth-efficient transmission of low-rate, short, and variable length packets in delay sensitive applications. On one or more AAL type 2 user information streams, the Segmentation and Reassembly Service Specific Convergence sublayer may be deployed. In this Recommendation, the sublayer structure and the procedures for the segmentation and reassembly process, as well as the optional transmission error detection and assured data transfer, are defined in depth.