Teltronics, Inc.

Harris Corporation

Digital Telephone Systems, Inc.

Herman Vis

David Charles Hochman

Terry Gregory Svetz

Stephen Weir

Stephen Bellato

Leonid Shvarzberg

Shad Muegge

John Henel

John B Henel

A modular digital telephone system and method featuring a universal telephony shelf adaptable for incremental expansion of legacy telephone switches and as a building block in the construction of new telephony switches. The shelf includes identification and connectors for shelf pairing, and is adapted to receive redundant power supplies, plural line cards, and either a peripheral shelf interface unit or a switch array card which provides both a local shelf interface and three interface units for connection to the peripheral interface units of other shelves. System wide fault displays are provided.

Device and method for expanding legacy switches

An apparatus and method for a telephone system includes a telephony switch comprising a timing and switch array card for effecting all switching and timing functions of the switch, a plurality of telephony line cards operatively connected to the timing and switch array card, and at least one power supply operatively connected to both the timing and switch array card and the plurality of line cards wherein said timing and switching functions comprise tone and conference functions, line card slot and alarm board interface functions, PCM switching functions, signal scanning and signal packet transfer buffer support functions, host computer interface functions, and clock and synchronization functions.

Timing and switching array and method

Shelf driver unit and method

Modular digital telephone system and method including an universal telephony shelf

Telephone loop feed apparatus in which a hybrid couples audio signals to and from the subscriber loop and presents a high impedance to the loop relative to the loop impedance. DC power is coupled to the loop by matched resistors which determine the loop feed matching resistance. DC power is blocked from the hybrid to avoid saturation.

Subscriber loop feed apparatus

Growing community of inventors

Santa Rosa, CA, United States of America

Herman Vis