초록 ▼

A two-way communication network for routing communications from and to a plurality of subscriber units at various geographic locations. The network includes a plurality of low power local subscriber units adapted to transmit and receive digital data messages of variable lengths and a central transmi

A two-way communication network for routing communications from and to a plurality of subscriber units at various geographic locations. The network includes a plurality of low power local subscriber units adapted to transmit and receive digital data messages of variable lengths and a central transmitter station (CTS). The CTS includes data transmission and data reception facilities. The transmission facilities transmit messages to the local subscriber units and include a synchronization unit that synchronizes the transmission facilities with a precision clock signal. The data reception facilities receive and process messages from the subscriber units. Remote receiver units are dispersed over the geographic area served by the CTS and relay digital messages transmitted from the subscriber units to the CTS. Each subscriber unit communicates with the CTS by way of digital data signals synchronously related to said precision clock signal and timed for multiplexed message transmission.

대표청구항 ▼

[ I claim:] [15.] A point-to-point communication network comprising:a network hub switching station,a plurality of central transmitter stations (CTSs),a satellite station,sets of remote transmitter stations (RTUs) located in a vicinity of each CTS, andmeans for providing for two-way digital communic

[ I claim:] [15.] A point-to-point communication network comprising:a network hub switching station,a plurality of central transmitter stations (CTSs),a satellite station,sets of remote transmitter stations (RTUs) located in a vicinity of each CTS, andmeans for providing for two-way digital communication between two different RTUs by a serial communication path extending through one of said CTSs, said satellite, said network hub switching station, said satellite and back to said one of said CTSs, wherein at least some of said CTSs serve a set of RTUs that are dispersed over predetermined geographic areas and includescommunication means between said RTUs including a set of stationary receive only terminals, which are remote from said CTSs and which are coupled by a communication link with said CTS for conveying transmitted messages from RTUs in a subdivided portion of said geographic area in a vicinity of said receive only terminals to said CTS,said CTSs including means for synchronizing said transmission facilities with a precision clock signal derived from an independent precision clock source;said RTUs transmitting signals at a peak power in a milliwatt range, anddata processing means at said CTS for assembling and re-transmitting digital subscriber messages from said RTUs via said satellite to said CTS, said RTUs transmitting on a plurality of frequency bands.