An Experimental Switching System Using New Electronic Techniques

Abstract

This is the first of a series of articles describing an experimental electronic telephone switching system employing a number of new techniques. These include use of a stored program, a network employing gas tube crosspoints, time‐division common control and large‐capacity barrier grid tube and photographic storage systems.

The impact of solid-state electronics on computing and communications

“…9 Subsequently, in the early 1960s, Bell Labs made a major breakthrough in the use of transistors for commercial switching systems with the introduction of the 101ESS PBX and the 1ESS central office (CO) switch. 10 Both these systems incorporated essentially the same number of semiconductors and made practical the use of a stored program processor.…”

The Ferreed - A New Switching Device

“…The reeds are mutually attracted, and, if the remanent flux is sufficient to overcome the spring force, the reeds will close, thereby establishing an electrical connection. THE FERREED -A NEW SWITCHING DEVICE 3 The connection is released by means of an exciting current pulse smaller in magnitude and of opposite polarity, which reduces the remanent flux of the ferrite member below that value necessary to hold the reeds closed. Since the force of attraction is proportional to the square of the flux between the reeds, the release current must not be allowed to exceed a certain maximum value; otherwise, sufficient reverse remanent flux will be produced to reclose the reeds.…”