Multiplex communications – Wide area network – Packet switching
Patent
1979-06-18
1981-03-24
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 67, 370 84, H04Q 1104, H04J 600
Patent
active
042584345
ABSTRACT:
A bit-by-bit time-division digital switching network switches a plurality of incoming and outgoing isochronous digital data channels having rates which are different but sub-multiples of a given low rate. After phasing said incoming digital channels, bits having a predetermined binary state are detected. Previously stored address words of said outgoing digital channels to be switched to said incoming digital channels are read-out and correspond to switched incoming channels whose detected bits have said predetermined binary state. Then the read outgoing channel address words are multiplexed into a multiplex digital highway at high rate. In the transmission part of each outgoing digital channel address words of said outgoing digital channel are detected. A bit at said predetermined binary state or a bit in the other binary state is transmitted on the outgoing digital channel in response to the detection or failure of detect the address word of said outgoing digital channel.
REFERENCES:
patent: 3715505 (1973-02-01), Gordon
patent: 3971891 (1976-07-01), Wolcott
patent: 3988674 (1976-10-01), Sciulli
patent: 4110563 (1978-08-01), May
patent: 4117269 (1978-09-01), Kampen
patent: 4119795 (1978-10-01), Hoelzl
Glowinski Albert
Lucas Pierre M.
Saffitz Abraham A.
Stewart David L.
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