1977-02-01
1978-09-05
Robinson, Thomas A.
179 18GF, H04M 300
Patent
active
041122607
ABSTRACT:
An ac type line concentrator for use in a data communication system, comprising a crosspoint switch circuit. The crosspoint switch circuit is constituted by a plurality of crosspoint switches capable of switching an analog signal (hereinafter referred to as an analog switch), so that a carrier signal modulated by a data signal may be transferred from one of m incoming lines connected with m terminal units to a selected one of n(n<m) outgoing lines connected with a central unit through the ac type line concentrator without being demodulated.
REFERENCES:
patent: 3073906 (1963-01-01), Lee
patent: 3988543 (1976-10-01), Dall'Olio et al.
Akutsu Yoshio
Fujiwara Michio
Ishii Yasuo
Itoh Schun'ichi
Kurokawa Takashi
Hitachi , Ltd.
Hitachi Denshi Kabushiki Kaisha
Japanese National Railways
Robinson Thomas A.
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