Multiplex communications – Wide area network – Packet switching
Patent
1983-11-23
1987-03-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 300, B61L 1500
Patent
active
046513175
ABSTRACT:
A time division multiplex data transmission system. A particular time slot among those for data transmission is placed with alternation of different data modes such as "1" and "0" in a commanding station destined for issuing commands. The alternation of data modes is supplied to receiver stations together with other data. When alternation of data modes is detected at the particular time slot in the receiver station, the reception of one command signal from the commanding station is confirmed, while detection of disappearance of the alternation of data modes indicates other command. Since a fault in the data transmission system results in generation of a fixed data mode or level such as "1" or alternatively "0", the alternation of data modes and disappearance thereof can define the commands discriminatively from the state brought about by the fault. Fail-safe feature can thus be realized.
REFERENCES:
patent: 3814861 (1974-06-01), Robbins
patent: 3898373 (1975-08-01), Walsh
patent: 4090173 (1978-05-01), Sibley
patent: 4166272 (1979-08-01), Deck
Koninklijk Instituut van Ingenieurs, Belgisch Instituut van Regeltechniek en Automatisme en Nederlanos Instituut van Register Ingenieurs; "Remote Control of the Gurreh Crupe Pumping Station in Iran"; Geleen; 9-30-71 to 10-1-71; pp. 37-50.
Hori Takamasa
Saito Kunio
Sato Hiroshi
Tashiro Korefumi
Hitachi , Ltd.
Olms Douglas W.
Scutch III Frank M.
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