ITU-T I.381 PDF

This Recommendation specifies an approach for the performance description of AAL processes [1]. It is motivated by the need, based on field experiences, to examine more carefully the performance aspects of some specific applications of ATM network technology. The approach provides a unified framework for describing the performance of a process that depends upon AAL Type 1 (AAL-1) [2], AAL Type 2 (AAL-2) [3], AAL Type 3/4 (AAL-3/4) [4], AAL Type 5 (AAL-5) [5], or potentially other types of AAL. The Recommendation defines measurement points and reference events for all AAL types, and uses these to define PDU transfer outcomes and AAL performance parameters for AAL Type 5 (PDU transfer outcomes and AAL performance parameters for other AAL Types are FFS).