Alternatives for Data Network Architectures

The increasing use of computer data communications over the past several years has spawned a variety of network architectures to support requirements for distributed processing. Developed by various R&D groups,^1-3by the common carriers,^4-4by minicomputer and mainframe manufacturers,^7,8and by the vendors of traditional communications hardware,^9,10these new architectures represent alternative means to similar ends. This article provides a framework for understanding existing and forthcoming systems, focusing particular attention on the impact of evolving requirements and technologies.