Multiplex communications – Wide area network – Packet switching
Patent
1988-07-13
1990-08-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8515, 34082505, H04J 300
Patent
active
049493361
ABSTRACT:
In an annular transmitting system including a ring-like transmission path realized by interconnecting serially a plurality of transmission stations in an annular form, at least one of the transmissions stations generating repetitively a transmitting frame constituted by a plurality of transmission units referred to as time slots, the frame being circulated along the transmission path, wherein transmission of information among transmission stations is performed in such a manner in which each of the transmission stations having a request to send information inserts the information in the slots by dividing the information, which information is ultimately fetched by the transmission station destined to receive that information, a multi-slot access system in which each of the time slots is provided with an area indicating whether the associated time slot is "free" or "busy", wherein the transmission station having a request to send information determines that the sending of the information is enabled when it is detected that one time slot located at a particular position within the transmitting frame is "free" or when it is detected that the time slot succeeding immediately to the "busy" slot is "free", to thereby set successively those usable time slots which succeed to the detected "free" time slot to the "busy" state and insert the information in these usable time slots.
REFERENCES:
patent: 4516240 (1985-05-01), Kume et al.
patent: 4612637 (1986-09-01), Davis et al.
patent: 4685105 (1987-08-01), Shikama et al.
T. Kawabata et al, "Ring-Type Optical Network of 100 Mbyts/Sec. Interlinking Bus-Type Networks", Nikkei Electronics, Dec. 5, 1983, pp. 173-199.
Hamada Takuji
Okada Masakazu
Takahashi Masahiro
Yoneda Katsuhiko
Hitachi , Ltd.
Hsu Alpus H.
Olms Douglas W.
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