Pulse or digital communications – Repeaters – Testing
Patent
1989-06-29
1991-07-02
Tarcza, Thomas H.
Pulse or digital communications
Repeaters
Testing
H04B 1500
Patent
active
050291831
ABSTRACT:
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations, then sent by the base stations to the central computer by a serial link. Direct sequence spread spectrum modulation is used for the RF link. The remote hand-held units initiate an exhange using RF transmission to and from the base stations, receiving only during a rigid time window following a transmission from the remote unit. The base stations cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange.
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Cain David
Symbol Technologies Inc.
Tarcza Thomas H.
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