Evolution of the DQDB hybrid multiplexing for an integrated service packetized traffic
A. Gagnaire, Benoît Ponsard · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1991
The Distributed Queue Dual Bus network (DQDB) [1] is a candidate for the IEEE 802. 6 Metropolitan Area Network (MAN) standard. This network integrates two classes of traffic on the basis of an hybrid multiplexing technique. In this paper we propose a packet-switching multiplexing suitable for both asynchronous and synchronous traffic on DQDB. First we consider an extension of the Distributed Queueing protocol (DQ) adapted to real time constraints. We call it general Distributed Queueing protocol (g-DQ) [2] . The g-DQ protocol needs (as DQ does) a load control algorithm to be reliable under heavy load. Among several possible algorithms we investigate an adaptation of the Load-Controlled Scheduling of Traffic (LOCOST) [3] to g-DQ. Our simulations show the feasibility of such an adaptation. Finally we define the main characteristics of a new packet-switching multiplexer for DQDB which should facilitate the opening of this MAN towards the Broadband ISDN (B-ISDN). KEY-WORDS: Metropolitan Area Networks (MAN) High-Speed networks load control algorithm packetized traffic hybrid multiplexing Asynchronous Transfer Mode (ATM) B-ISDN.