Digital has some of the highest performing networking products in industry today. Transfer rates of 3.2 megabits per second and higher have been measured on an Ethernet. These high speeds result from careful performance analyses and planning at all stages of the development cycle. A set of case studies illustrates these analyses. These studies include performance modeling for adapter placement in the physical layer; buffering in the data link layer; path splitting in the network layer; cross-channel piggybacking, timeout and congestion algorithms in the transport layer; and file transfer and terminal communications in the application layer. Completing the paper are studies on network traffic measurements and workload characterization.

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