ATM COMMUNICATIONS SYSTEM AND METHOD

摘要

There is disclosed a method and system for multiplexing data from a plurality of user data sources across an ATM adaptation layer type-2 connection, in which a multiplexed trunk group extends across a plurality of common part sub-layer protocol data unit (CPS-PDU) mini-cells, and across a plurality of ATM cells. Large trunk groups are assembled by use of a single bit continuation indicator in the service specific convergence sub-layer header (SSCS) of successive CPS-PDU mini-cells. A packet payload type field (PPT) of the common part sub-layer (CPS)/service specific convergence sub-layer (SSCS) is used to indicate timing of changes in number of user data sources in a trunk group and provides for robust error recovery on loss of a single CPS-PDU mini-cell.