Remreed Switching Networks for No. 1 and No. 1A ESS: Physical Design of Remreed Switching Networks

Manufacture of the ferreed switching frames originally designed for use in No. 1 ESS central offices1-2 is being phased out in favor of the new remreed switching frames. These five new codes of remreed frames are shown in Figs. 1 through 5 and provide the basic building blocks from which all line link and trunk link network configurations are constructed. These new frames make use of the recently developed remreed sealed contacts, 3 new all-electronic network controllers, and the new 1A technology packaging hardware. 4,5 Basic line link and trunk link network switching functions performed by the remreed frames were constrained 6 to be identical to those performed by the ferreed frames they replace. Basic physical design concepts for the line link network configurations were developed at the same time the remreed trunk link network was being designed. This approach enabled us to take advantage of the commonality of apparatus and hardware piece-parts such as circuit packs, control units, mounting plates, grid-support hardware, wiring troughs, etc. The apparatus and piece-part commonality achieved be607