Multiplex communications – Wide area network – Packet switching
Patent
1978-03-17
1980-05-06
Brown, Thomas W.
Multiplex communications
Wide area network
Packet switching
370 86, 370100, H04J 306, H04Q 1104
Patent
active
042018900
ABSTRACT:
A multiport single sided switching element is described for providing space and time switching between the input ports thereof and the output ports thereof in response to digital command signals for frames of digitally encoded data in a plurality of channels which is phase (bit) asynchronously coupled to any port of the switching element, the command signals being in for example the same channels as is the data. Every port of the single sided switching element is adaptable as either an inlet or an outlet and thus may be configured in a switching network as a one-sided, as a two-sided, or multisided switching element and includes a time division multiplexed bus for providing a space path between the ports of the switching element and further includes transmit and receive logic at each port responsive to command signals for coupling data from the input of any port to the TDM bus and additional logic at each port selectively responsive to command signals for bit synchronously extracting the data from the TDM bus in any channel thereby providing time slot interchange prior to coupling of data from the switching element to other switching elements. In a preferred embodiment, a sixteen port switching element is described.
REFERENCES:
patent: 3781818 (1973-12-01), Pardoe et al.
patent: 3912873 (1975-10-01), Skaperda
patent: 3997896 (1976-12-01), Cassarino, Jr. et al.
patent: 4030072 (1977-06-01), Bjornsson
patent: 4031512 (1977-06-01), Faber
patent: 4050097 (1977-09-01), Miu et al.
patent: 4074072 (1978-02-01), Christensen et al.
"Generic Digital Switching System", by N. J. Skaperda, International Switching Symposium 1976, Tokyo, Japan, Oct. 1976.
Denenberg Jeffrey N.
Lawrence Alan J.
Rubinstein Murray
Upp Daniel C.
Brown Thomas W.
International Telephone and Telegraph
Morris Jeffrey P.
O'Halloran John T.
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