DQDB

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DQDB

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DQDB

(Distributed Queue Dual Bus) The protocol used to control access to an IEEE 802.6 queued packet synchronous exchange (QPSX) network, used for metropolitan area networks (MANs). This architecture allows for both circuit and packet switching and supports data, voice and video traffic. Using fixed length cell relay technology, DQDB is suited to volatile network traffic.

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A key feature of DQDB is that the buses operate independently of each other and of the access units, so that stations may fair or be removed from the network without causing operational problems elsewhere.

As a public network, DQDB subnets can provide switching and routing for high-speed data, voice, and video applications, as well as the interconnection of private DQDB subnets and other private networks.

User clout fuels drive for open systems standards

What appears to distinguish the DQDB algorithm from all others is that it provides the efficiency of an Ethernet at low access rates and similar efficiences to a Token Ring during peak demand periods.