A 4-wire crossbar conferencing system

The necessity that large numbers of people confer by means of communication facilities has been steadily increasing; in fact, many military communicators have indicated that such conferencing is absolutely mandatory. The system presented in this paper is a 4-wire manually controlled conference switchboard specifically designed to provide the features required for supporting such conference situations. The use of 4-wire facilities is described in such a manner as to stimulate further investigation.