Abstract
The paper presents two variations of a Local Area Network based on a modified concept of Ethernet. Unlike many other concepts (e.g. collision-free protocols) the proposed modifications are simple, realistic and inexpensive. In particular, the essence of the CSMA-CD protocol is retained. The performance of the new networks is demonstrated to be superior to the performance of standard Ethernet. The second network (DCS) seems to be particularly interesting, as (despite the collision protocol) its asymptotic effective throughput turns out to be equal to the theoretical maximum. The presented networks are used to demonstrate a certain approach to investigating and eliminating the unfairness of a bus protocol in which stations can transmit spontaneously.
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