Multiplex communications – Wide area network – Packet switching
Patent
1977-08-30
1980-10-07
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
455612, H04B 900
Patent
active
042270758
ABSTRACT:
A control system for the simultaneous and independent transmission of a plurality of command signals includes a transmitting device and a receiving device interconnected by an optical waveguide. The transmitter simultaneously receives a plurality of command signals at parallel inputs and converts the signals to consecutive serial signals which are utilized to modulate a light source that is optically coupled to the optical waveguide. The receiver detects the consecutive serial optical signals and generates corresponding electrical signals which are thereafter converted to simultaneous parallel output signals that may be used to activate command functions. The unique use of an optical waveguide provides for dielectric isolation between the transmitter and receiver so that an operator may be electrically isolated from potentially dangerous high voltage equipment. The system is particularly useful in areas subjected to electromagnetic interference where radio-type controls or hard-wired metallic conductors would be adversely affected by strong electromagnetic interference.
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Kudo-New Fiber Cable Transmission Systems Using LED Semiconductor Laser as Optical Source, JEE, No. 115, pp. 42-46, Jul. 1976.
International Telephone and Telegraph Corporation
O'Halloran John T.
Orsino Jr. Joseph A.
Safourek Benedict V.
Van Der Sluys Peter C.
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