An introduction to the Bell System's first electronic switching office
R. W. Ketchledge · 1958
A fully electronic telephone central office is being developed for experimental Bell System service. Both the electronic devices themselves and their system organization represent major changes in the art of telephone switching. The electronic switching system consists of electronic voice frequency switches controlled by electronic memory and logic. However, the system is not designed on the basis of direct substitution of electronic circuits for corresponding relay circuits of an existing switching system. Rather, the electronic circuits are organized in ways that exploit the advantages of the electronic technology.