Importance

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Abstract

A high-speed two-way optical data link has both light-emitting and light-sensing units mounted adjacent one another in a single housing together with a timing and control unit providing all signals necessary for simultaneous transmission and reception of dam. Synchronization to a clock signal is achieved by use of edge detectors which reset the counters to zero in the timing and control unit whenever a transition in data pulses is sensed. A pair of computers are linked using a program called 'Crosstalk' which performs full parity checking of all data received by an associated computer. The data link permits the computers to be 'live handshaking' and asynchronous at all times. Another embodiment comprises a strip array which eliminates the optical bulkiness of a parabolic reflector. The strip array also provides a better collection of infrared light since the photodetectors are spread over a larger area than previously allowed with a parabolic reflector. A further embodiment comprises a hemispherical array for communication throughout a room including an ovate or spheroid configuration.

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First Claim