Abstract
In this chapter, we discuss a range of second generation local area networks (LANs) and metropolitan area networks (MANs). By 'second generation', we mean those LANs and MANs with protocols that permit operation at bit rates and with data throughput an order of magnitude higher than existing 'first generation' systems. In practice, this translates to a capability for operation at bit rates of at least 100 Mbit/s. The following systems have been selected for discussion: fibre distributed data interface (FDDI); distributed queue dual bus (DQDB); asynchronous transfer mode ring (ATMR) and cyclic reservation multiple access version II (CRMA-II). The descriptions of the four systems will concentrate on their MAC protocols, which are vital to any insight and understanding of their operation. However, where appropriate, other attributes of the four will be explained for the sake of completeness.
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