The IEEE 802.6 standard describes a MAN (Metropolitan Area Network) standard called DQDB (Distributed Queue Dual Bus). The network is defined as a high-speed shared medium access protocol for use over a dual, counter-flowing, unidirectional bus networks. The use of paired bus provides a failure tolerant configuration. DQDB is able to carry data, voice, and video transmissions, with bandwidth being allocated using time slots on the bus.
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