The DQDB protocol and its performance under overload traffic conditions

Research output: Journal Publications and ReviewsRGC 22 - Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)261-270
Journal / PublicationComputer Networks and ISDN Systems
Issue number1-5
Publication statusPublished - Dec 1990
Externally publishedYes


The Distributed Queue Dual Bus (DQDB) protocol is being considered by the IEEE 802.6 and ANSI T1S1.1 as an important component in their Metropolitan Area Networks (MAN) and Broadband ISDN User Network Interface (BI-SDN-UNI) standards respectively. This paper provides first a description of DQDB focusing mainly on its distributed queue operation. Then, the performance of DQDB under traffic saturation for the cases of concentrated and widely separated sources is studied and discussed with a special focus on the effect of the elimination of the STANDBY state on fairness and throughput. It is shown that the new version of DQDB, without the STANDBY state, provides better fairness than the previous one which include the STANDBY state. © 1990.

Research Area(s)

  • DQDB, MAN, overload traffic, performance evaluation