The OSI95 transport service with multimedia support
The tremendous development of the communication environment with local area networks and broadband ISDN has opened the way for drastic changes in network performance and has introduced new services. Within the framework of Open Systems Interconnection (OSI), the goal of the ESPRIT project OSI95 (High Performance OSI Protocols with Multimedia Support on HSLANs and B-ISDN) was to design and formally specify a new transport service (and a transport protocol) able to meet the requirements of the new applications and to offer the services available at network and sub-network levels. This report gives an extended presentation of the new networking environment and the rationale for new standards, then presents the various tasks and goals of the OSI95 project.
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The Networking Environment of the Nineties and the Need
The XTP Study
Validation of the Xpress Transfer Protocol XTP
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andthen architecture ATM Adaptation Layer B-ISDN behaviour buffer bytes calling OSI95 CCITT cell CNTL packet communication compulsory Computer connectionless connectionless-mode constraints CONTEXT continuous media Danthine data transfer defined direction of data endproc endtype entity environment eqns eqns forall error control Estelle exit false fast connect FDDI Formal Description Techniques functions implementation indication interaction interface ISO/IEC IsValidCon2For jitter layer LOTOS LOTOS-T mechanism module multicast multimedia multiplexing negotiation network layer nmax noexit nthld ofsort Bool OnTopOf Open Systems Interconnection opns orchestration OSI Reference Model OSI95 Transport Service OSI95 TS provider OSI95 TS user performance pgih primitive QoS parameters QoS value queue re-negotiation received request requirements semantics sender sequence service provider service user simulation specification synchronisation T-ACKDATA T-RELEASE ta:TAddress tcei:TCEI tsp:TSP tcei TCEP TCRERCont thld throughput TPDUs transit delay transmission transport protocol TSDU virtual circuit