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A study of the architectures of the systems that provide telephone service, including a look at architectures for future systems. It describes the hardware and software of five different systems in detail and also examines how factors such as customer services have affected switching systems.

Presenting a description of automated HF communications, this work also considers the many phenomena which affect HF radio, and offers insight into new and future HF techniques. It includes information on automatic link establishment (ALE) technology.