Multiplex communications – Communication over free space – Repeater
Patent
1996-10-10
1998-11-24
Nguyen, Chau
Multiplex communications
Communication over free space
Repeater
370341, 370353, H04B 7208
Patent
active
058417656
ABSTRACT:
A demand-based connection management satellite communication network includes a plurality of geographically distributed earth stations, each earth station having a frame relay protocol-based switch for interfacing message signals between terminal devices and modem unit. One of the earth stations is a hub station whose modem unit includes plural demodulators tuned to carrier frequencies transmitted from other, remote stations. Each remote station has at least one hub-programmable demodulator and/or a programmable modulator. When an originating station receives a request from a terminal device for connectivity with a terminal device at a destination station, it transmits a connectivity request message to the hub station. In response, the hub station checks a demodulator and/or modulator frequency assignment database for demodulator availability. If each originating and destination station has an available demodulator and modulator pair, the hub transmits tuning messages to the two stations, which tune their programmable modem components to each other's carrier frequency, and thereby provide bidirectional connectivity between the two remote stations.
REFERENCES:
patent: 4868811 (1989-09-01), Suzuki
patent: 5274837 (1993-12-01), Childress et al.
patent: 5434850 (1995-07-01), Fielding et al.
patent: 5530916 (1996-06-01), Schultz
patent: 5572530 (1996-11-01), Chitre et al.
Arnold John P.
Fielding Dennis E.
Gross Todd W.
Nguyen Chau
Skydata, Inc.
Wands Charles E.
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