INTERACTIVE NATIONWIDE VIDEO DATA SERVICE COMMUNICATION SYSTEM FOR STATIONARY AND MOBILE BATTERY OPERATED SUBSCRIBER UNITS

摘要

A point-to-point interactive video network system having a central switching station, a plurality of base stations, a terrestrial station, and a set of subscriber units located in the vicinity of each base unit, comprising in combination: means for providing for two-way digital communications between two different subscriber units by a serial communication path extending through a base station, the telecommunication network central station, the satellite and back to a base station, wherein at least some of said base stations serve a set of subscriber units dispersed over a predetermined geographic area and comprise communication means between the subscriber units with the base station including a set of stationary receive-only terminals remote from the base station coupled by a communication link with the base station for conveying transmitted messages from subscriber units in a subdivided portion of said geographic area in the vicinity of the receive-only terminals to the base station; subscriber transmitter units for transmitting digital modulated pulses; and data processing means at the base station for assembling and re- 317 י" ג בתמוז התש" ס - July 16, 2000 transmitting digital subscriber messages from the subscriber units via the satellite to the central station, said subscriber units transmitting on a plurality of frequency bands.