Multiplex communications – Wide area network – Packet switching
Patent
1987-09-28
1989-02-28
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 370 96, H04J 324, H04J 316
Patent
active
048092681
ABSTRACT:
A random access multipoint data communication system comprises a central station and a plurality of remote stations. A multiple access channel is established from the remote stations to the central station and a broadcast channel is established from the central station to the remote stations. The central station generates a timing signal for causing each of the remote stations to define commonly shared time slots on the multiple access channel. Each remote station transmits data on a randomly determined time slot of the multiple access channel. The central station periodically and sequentially interrogates the remote stations to return an acknowledgment and processes the returned acknowledgements to determine the presence of a malfunctioning remote station. To avoid data collision, the central station specifies an idle time slot on which the interrogated remote station is requested to send the acknowledgment.
REFERENCES:
patent: 4167730 (1979-09-01), Brown
patent: 4653049 (1987-03-01), Shinmyo
patent: 4654656 (1987-03-01), Deaver et al.
patent: 4672608 (1987-06-01), Ball et al.
Fujii Akira
Tejima Shunichiro
Chin Wellington
NEC Corporation
Olms Douglas W.
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