Multiplex communications – Wide area network – Packet switching
Patent
1979-06-06
1984-09-04
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
455 51, H04J 306
Patent
active
044701411
ABSTRACT:
The inventive system includes a central station and a plurality of satellite stations which communicate on a time division multiplex basis. The central station generates frame synchronizing and clock signals, along with digital communication signals, which are suitably modulated into channel time slots. During its individually assigned channel time slot, each satellite station extracts the frame and clock signals and demodulates the communication signals which were directed to it. The extracted frame and clock signals are used in the satellite station to retime the communication signals which are sent in bursts of modulated carrier waves from the satellite stations to the central station. The central station demodulates the bursts of carrier waves to transmit the intelligence therein to its destination. The advantage is that many stations can share the same frequency and thereby make more efficient use of the transmission capacity.
REFERENCES:
patent: 3532985 (1970-10-01), Glomb
patent: 3836721 (1974-09-01), Sugioka
patent: 4117267 (1978-09-01), Haberle
patent: 4129755 (1978-12-01), Murakami
Nippon Electric Co. Ltd.
Olms Douglas W.
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