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IEEE 802.6
The IEEE 802.6 standard describes a MAN standard called Distributed Queue Dual Bus (DQDB). Much more than a data network technology, DQDB is suited to data, voice, and video transmissions. The network is based on fiber-optic cable in a dual-bus topology, and traffic on each bus is unidirectional. When operated in pairs, the two buses provide a fault-tolerant configuration. Bandwidth is allocated using time slots, and both synchronous and asynchronous modes are supported.