Data transmission system
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United States of America Patent
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-
Oct 6, 1981
Issued Date -
N/A
app pub date -
Oct 29, 1974
filing date -
Nov 23, 1967
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The main features of the present invention reside in the fact that one or more remote groups of subordinated terminal units are serially interconnected and arranged in a closed loop which is terminated at the output and input of a master unit. Each of said groups and said master unit is connected to the transmission line via a modulator and a demodulator. In order to selectively connect a pulse equipment associated with each subordinated terminal unit, and adapted for transmission of data, with the transmission line, each of said subordinated terminal units includes a switching unit, which either connects or disconnects the associated pulse equipment from the transmission line. According to the invention, the novelty resides both in the arrangement of the network connecting the subordinated terminal units with the master pulse equipment, and the procedure for the exchange of information between the master pulse equipment and the subordinated terminal unit, and vice versa, through the closed loop, and by selectively actuating said switching unit.
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