Paketdatenübertragungssystem

Paketdatenübertragungssystem

A packet data transmission system is used to link a number of remote hand-held data-gathering units (15) such as bar code readers to a central computer (10) which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations (12, 13,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: TYMES, LAROY
Format: Patent
Sprache:ger
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS
HANDLING RECORD CARRIERS
MULTIPLEX COMMUNICATION
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:A packet data transmission system is used to link a number of remote hand-held data-gathering units (15) such as bar code readers to a central computer (10) which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations (12, 13, 14), then sent by the base stations to the central computer (10) by a serial link. Direct sequence spread spectrum modulation is used for the RF link. The remote hand-held units initiate an exchange using RF transmission to and from the base stations (12, 13, 14), receiving only during a rigid time window following a transmission from the remote unit. The base stations (12, 13, 14) cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange.