Remreed Switching Networks for No. 1 and No. 1A ESS: Remreed Switches

Abstract

This paper describes a series of new two-wire matrix switches that have been developed for No. 1 ess remreed networks. These switches utilize the new 238A sealed contact, are designed to maximize the use of automatic manufacturing techniques, and typically contain twice the number of crosspoints as conventional ferreed switches. However, as a result of increasing the crosspoint packing density, the new remreed switches consume less frame area and total volume than their ferreed counterparts. In addition to the increase in the number of crosspoints, the new switches also contain many semiconductor devices required in the control scheme adopted for No. 1 ess remreed networks. The extensive use of printed-wiring boards to interconnect the individual crosspoints facilitated the mounting of semiconductor components within the switch, thus yielding a natural integration of the crosspoints and the devices used to control them. A total of seven switch codes have been developed to produce No. 1 ess line link and trunk link networks. The manufacture of these switches has been simplified by achieving a high degree of commonality among the piece parts used to produce each code.