Multiplex communications – Wide area network – Packet switching
Patent
1985-09-13
1987-08-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04J 302, H04J 324
Patent
active
046897852
ABSTRACT:
A data transmission system having a plurality of stations and bus structure connected among the stations for sending an information data or an answer back data in a packet from one station to another station through the bus structure. Each station has a receiver which receives the packet and detects that the packet of information data is directed to the station by identifying the address data. If it is so detected that the packet is directed to this station, an acknowledge signal is produced. A carrier sensor is provided for producing a presence signal indicative of the presence of the packet on the bus structure. A counter starts to count time when the presence signal disappears, and produces first and second time-up signals after the lapse of first and second predetermined times, respectively, provided that the first predetermined time is shorter than the second predetermined time. A transmitter prepares the packet of answer back data in response to the receipt of the acknowledge signal and transmits the prepared answer back data after the counter has counted the first predetermined time and before the end of the second predetermined time.
REFERENCES:
patent: 4332027 (1982-05-01), Malcolm et al.
patent: 4342995 (1982-08-01), Shima
patent: 4399531 (1983-08-01), Grande et al.
patent: 4451827 (1984-05-01), Kahn et al.
Higashitsutsumi Yoshihito
Toyonaga Kenji
Yanai Akihiro
Olms Douglas W.
Sanyo Electric Co,. Ltd.
Scutch III Frank M.
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