Patent ID: 6108336
Filing Date: 2000-08-22
Classification: H04L

Abstract:
A method for transmitting a Constant Bit Rate (CBR) or Variable Bit Rate (VBR) traffic in a streaming mode using functions of the ATM Adaptation Layer 5 (AAL-5) Common Part Convergence Sublayer (CPCS), in an Asynchronous Transfer Mode (ATM) network comprising a plurality of nodes interconnected with communication links and transmitting said traffic in fixed length ATM Protocol Data Units (ATM-PDUs), said method comprising the steps of:receiving an ATM-PDU,building a Segmentation and Reassembly Sublayer PDU (SAR-PDUs) by removing the ATM header from the ATM-PDU,building a CPCS Interface Data Unit (IDU) by assembling one or more of SAR-PDUs,delivering the CPCS-IDU not comprising a CPCS-PDU trailer before a complete CPCS-PDU is received,checking the CPCS-IDU including a CPCS-PDU trailer by means of a Cyclic Redundancy Check (CRC) included in the CPCS-PDU trailer:if the CRC checking determines that the CPCS-IDU is correct:the CPCS-IDU payload is delivered.if the CRC checking determines that the CPCS-IDU is incorrect:the CPCS-IDU payload is delivered,the CPCS-PDU trailer and predetermined protected fields are ignored.