At high data transmission rates, the packet transmission time of a local area network (LAN) could become comparable toorless than themedium propagation delay. The performance of many LAN schemes degrades rapidly when the packet transmission time becomes small comparative tothemedium propagation delay. This paper introduces LANs and discusses the performance degradation of L4Ns at high speeds It surveys recently proposed LAN schemes designed to operate at high data rates, including their performance characteristics.In addition to the performance objectives, other characteristics desirable in LAN medium access protocols are identified and discussed. Thepaper serves asatutorial forreaders less familiar with local computer communication networks. It also serves as a survey of the state-cf-the-art LANs.

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X-Net is a new local area network based on the dual, unidirectional bus topology. Stations are connected to two fiber-optic busses using active switches. At light load, XNet behaves as a random access scheme. With increasing load, transmissions are done in an orderly manner, arranged into cycles.The main advantage of X-Net is its superior channel utilization and delay performance, compared to other bus schemes. The packet delay is bounded at all loads. Performance is shown to be satisfactory over a wide range of a values, where a is the ratio of end-to-end medium propagation delay to the packet transmission time. Therefore, XNet is a suitable candidate for operation at high speeds.

No abstract

X-Net is a new local area network based on the dual, unidirectional bus topology. Stations are connected to two fiber-optic busses using active switches. At light load, X-Net behaves as a random access scheme. With increasing load, transmissions are done in an orderly manner, arranged into cycles. The main advantage of X-Net is its superior channel utilization and delay performance, compared to other bus schemes. The packet delay is bounded at all loads. Performance is shown to be satisfactory over a wide range of a values, where a is the ratio of end-to-end medium propagation delay to the packet transmission time. Therefore, X-Net is a suitable candidate for operation at high speeds.