Distributed-queue dual-bus
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In telecommunication, a distributed-queue dual-bus network (DQDB) is a distributed multi-access network that (a) supports integrated communications using a dual bus and distributed queuing, (b) provides access to local or metropolitan area networks, and (c) supports connectionless data transfer, connection-oriented data transfer, and isochronous communications, such as voice communications.
IEEE 802.6 is an example of a network providing DQDB access methods.
Source: from Federal Standard 1037Cde:DQDB