Multiplex communications – Wide area network – Packet switching
Patent
1982-12-27
1985-04-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 312
Patent
active
045120153
ABSTRACT:
A digital time-divison switch comprising a multiplexer which multiplexes digitalized voice signals, supervisory signals transmitted from line circuit portions, and so forth, and which inserts these signals into predetermined time slots. The digital switch also includes a signal-extracting circuit which extracts the supervisory signals from the time slots assigned for control signals and which transmits the extracted supervisory signals to a common control unit through the supervisory signal receiver, a switching network which switches data time slots, a signal inserting circuit for transmitting control signals to the line circuit portions, and a distributor circuit for distributing the voice signals and so on to each line circuit. The switch further includes a second signal-inserting circuit disposed between the signal-extracting circuit and the switching network, the second signal-inserting circuit inserting one-way signals transmitted from a switching network portion to the line circuit portions into the time slots assigned for control signals, in the other words into time slots into which supervisory signals extracted by the signal-extracting circuit are previously inserted.
REFERENCES:
patent: 4268722 (1981-05-01), Little et al.
patent: 4354264 (1982-10-01), Wurst
patent: 4430733 (1984-02-01), Hardy et al.
patent: 4437182 (1984-03-01), Lambert et al.
patent: 4437183 (1984-03-01), Profet
International Switching Symposium, S. Kutsukake et al., "A Digital Switching System for Central Office", Montreal, Sep. 21-25, 1981.
Review of Electrical Communication Laboratories, Kaneko et al., "Signalling Equipment for Digital Switching System", vol. 27, No. 9/10, Sep./Oct., 1979.
Post Office Electrical Engineers Journal, Potter, "Monarch 120-A New Digital PABX", vol. 73, Apr. 1980.
Fujisawa Makoto
Kan'o Yoshiharu
Nojiri Shoji
Tanaka Yoshikazu
Fujitsu Limited
Olms Douglas W.
Rokoff Kenneth I.
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