Multiplex communications – Wide area network – Packet switching
Patent
1986-05-06
1988-02-02
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370119, H04J 900, H04L 504
Patent
active
047232374
ABSTRACT:
A communication system comprises a plurality of subscriber stations (51-1 to 51-n) each of which comprise a transmitter (3) and a receiver (4). A switching network comprising a selection switch (57) and a synchronous digital switching network (60) is connected to the subscriber stations (51-1 to 51-n) via separating and combining circuits (52-1 to 52-n) each of which comprise a transmitter (3) a receiver(4) and an interface unit (55). The transmitter (3) transmits a signal comprising a square wave frequency modulated signals which is modulated by a wideband (video) signal, on transitions of which short or long pulses are initiated in response to a data signal. The wideband and data signals are separated in the separating and combining circuits (52-1 to 52 -n) to enable the wideband and data signals to be separately processed in the switching networks (57,60).
REFERENCES:
patent: 2583484 (1952-01-01), Guanella et al.
patent: 3178515 (1965-04-01), Bramer et al.
patent: 3623105 (1971-11-01), Kamen et al.
patent: 3715510 (1973-02-01), Birnbaum et al.
patent: 3862363 (1975-01-01), Tanimoto
patent: 4677608 (1987-06-01), Forsberg
Andrew Derek
James Michael D.
Briody Thomas A.
Gadson Gregory P.
Griffin Robert L.
Marcelo Melvin
Streeter William J.
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