A high-speed telephone switching network with electronic controls is described. The high speed allows one-at-a-time operation, reducing both the number and complexity of control circuits. Germanium diodes, transistors, cold-cathode tubes and fast relays perform the control functions; glass-sealed relay contacts provide paths for speech. A laboratory model of the network has performed reliably for over three years.
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Brewer et al. (1955) studied this question.