sentences:  Later crossbar systems also used computer control of their switching matrices and may be considered SPC systems as well.Examples include the Ericsson ARE 11 (local) and ARE 13 (transit) as well as the North Electric NX-1E & D Switches and the ITT Metaconta 11, once found throughout Western Europe and in many countries around the world.SPC technology using analog switching matrices was largely phased out in the 1980s and had disappeared from most modern networks by the late 1990s.