COMMUNICATIONS PROCESSOR SYSTEM HAVING A TIME SHARED COMMUNICATIONS CONTROL DEVICE AND MODEM

摘要

The specification discloses a communications processor system wherein a message-switching digital computer controls the transmission of digital data between terminals connected along a plurality of commmunications lines. The system includes a circuit control device for transmitting electrical digital signals from the computer. A modem is connected to the control device for converting the electrical digital signals into tone signals. A plurality of normally open switches are connected in parallel to the output of the modem. A switch address decoder is operable by the computer for sequentially closing selected ones of the switches. Interfacing circuitry connects each of the switches with one of the communication lines, such that tone signals are applied to the corresponding communications line when one of the switches is closed. Dialers are connected to each of the interfacing circuits and are operable by the computer to apply digital dialing signals to the communications lines when the switches are open. The present system thus time shares a single circuit control device and modem during transmission of digital data to the plurality of communications lines.