The relative merits of time-division multiplex versus space division as a mode of operation for electronic telephone exchanges
J. Gordon Pearce · Transactions of the American Institute of Electrical Engineers Part I Communication and Electronics · 1962
The development of electronic devices with long, reliable, lifetime capabilities offers a variety of trunking interconnections for telephone switching systems. These include, in addition to the simulation of mechanical contacts, time division transmission, hitherto impractical, made possible by their high speed nature. A time division system reduces costs and space requirements while approaching the trunking simplicity of a manual system with high-speed single control operation simplifying the inclusion of new services.