Originating and terminating markers -Broadband switching system

Operation of the AR matrix (which connects lines and trunks to the register) and of the line matrix (which connects the calling and called stations) is controlled by Originating and Terminating Markers, respectively. "Modular" construction permits adaptation to offices of various sizes; duplicate facilities are used alternately, but each can carry all the load if necessary, without degrading service. This paper describes the circuits that comprise the Originating and Terminating Markers.