Abstract: A method compatible with the multiple fax and data modem protocols to determine if a session originating terminal is a fax terminal or a data terminal without user intervention while allowing data terminals to operate at the highest possible speed. Further, there is a method of providing improved internetworking of fax machines over links that include relay technology.

Abstract: A space and time switch receives digitized voice and/or data as forty-six separate serial bit streams with each voice or data path occupying one time-slot on one bus, resulting in a total of 1472 paths entering the switch. The switch originates buses and the information in any incoming path can be switched to any outgoing path providing a 1472-by-1472 switching function. The switch includes six basic functional blocks: input, output, speech RAMs, control RAM, controller interface, and state machine. The controller interface receives commands in the form of twenty-four bits appearing as three bytes in three separate operations, stores the bytes until all three are ready, and transfers the command bytes as a combination of address and data bits. The speech RAMs store a complete frame of the data transferred within each time-slot. The control RAM stores commands from the controller interface.

Abstract: A space and time switch receives digitized voice and/or data as twenty-two separate serial bit streams with each voice or data path occupying one time-slot on one bus, resulting in a total of 704 paths entering the switch. The switch originates twenty-two buses and the information in any incoming path can be switched to any outgoing path providing a 704-by-704 switching function. The switch includes six basic functional blocks: input, output, speech RAM, control RAM, controller interface, and state machine. The controller interface receives commands in the form of twenty-four bits appearing as three bytes in three separate operations, stores the bytes until all three are ready, and transfers the command bytes as a combination of address and data bits. The speech RAM stores a complete frame of the data transferred within each time-slot. The control RAM stores commands from the controller interface.

Abstract: A conferencing bridge is provided for an electronic telephone system to support telephone conversations involving three or more parties. The conferencing bridge implements a conferencing algorithm using simple arithmetic operations. The conferencing bridge circuitry implements the algorithm by summing each party's contribution to the conference deriving a grand total, and subtracting each party's contribution from the grand total.