OVERVIEW OF AN A.M.P.S. (ADVANCED MOBILE PHONE SERVICE) MOBILE CALL PROCESSING SYSTEM
R.M. Fuller, F.A. Epler · 1980
An Advanced Mobile Phone Service (AMPS) call processing logic and ten-kilobit-per-sec. data receiver were designed for Bell Telephone Labs.' cellular telephone market trial in Chicago. The call processing logic board contains the major elements of the system, including the 8085 microcomputer system, supervisory audio tone transponder, IEEE (Inst. of Electrical and Electronics Engineers) 488-1975 Bus interface to the AMPS control unit, and transceiver interface. Included on a smaller circuit card are the clock acquisition system, and integrate and dump circuits, as well as the antenna diversity supervisory system. Barker word synchronization and bit stripping are accomplished in the main 8085 system. Initial design goals are outlined and the major system elements are described and diagrammed. Approximately 500 mobile telephone units have been operated in customer vehicles with good results.