Abstract: In 1987 the DQDB (Distributed Queue Dual Bus) technology for MANs (Metropolitan Area Networks) was standardized in IEEE 802.6. Today in Europe, over 20 MANs are in place. The results of the first trials were from an operational viewpoint very successful and a big step in transmission power. So now, just a short time after both bodies, Bellcore (for the USA) and ETSI (for Europe) decided to standardize on SMDS/CBDS (Switched Multimegabit Data Service/Connectionless Broadband Data Service) as the new high-speed services, based on MAN technology, for regional and supra-regional areas, these services are now being introduced in the USA and Europe as global, public services. !5
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