GROUP SELECTING ARRANGEMENT FOR AUTOMATIC TELEPHONE SYSTEMS USING CROSSPOINT RELAY MATRIX SWITCHES

1,131,369. Automatic exchange systems. HER MAJESTY'S POSTMASTER GENERAL, and AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. 31 Oct., 1966 [18 Nov., 1965], No. 5533/68. Divided out of 1,131,367. Heading H4K. In a group selector having two networks each comprising a plurality of linked primary and secondary relay cross-point matrices, the outlets of each network are formed into levels comprising corresponding outlets of the secondary switches, the inlets of each network having individual access circuits, a control equipment (stage register) being provided for both networks in common and giving service to seized access circuits one at a time to be operative upon a digitally indicated group of outlets comprising at least one output level of the network served by the access circuit. The group selector is that described in Specification 1,131,367.