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In this paper, we make a performance and reliability comparison of two networks that have been proposed for use as high speed Metropolitan Area Networks (MAN'S) -the Manhattan Street network (MS-Net) and the Distributed Queue Dual Bus (DQDB) network. Both networks use slotted access protocols and have the same number of links, transmitters and receivers per node. The DQDB network has been adopted by the IEEE 802.6 committee as the Metropolitan Area Network (MAN) standard. The purpose of this paper is to demonstrate the relative superiority of the MS-Net over the DQDB network. We show that the MS-Net provides a much higher network throughput for a variety of traffic patternsuniform and non-uniform. We also look at the reliability of both networks and show that the MS-Net can survive more fklures than the DQDB network and that failures cause a lesser performance degradation in the MS-Net. It is also shown that higher level mechanisms are required in the DQDB network to recover from link failures whereas defection routing is sufficient in the MS-Net.

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