H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 11/02 (2006.01) H04J 1/05 (2006.01) H04J 1/12 (2006.01) H04L 12/28 (2006.01)
Patent
CA 1269159
Abstract: The present invention relates to a switching technique for packet Frequency Division Multiplexed (FDM) communication systems. In the present system, each of N system users is assigned (a) either a separate fixed one of N transmit frequency channels or a selected free one of L transmit frequency channel for communications to a head-end FDM channel switching means, and (b) a fixed assigned separate one of N receive channels for communications from the head-end FDM channels switching means. At the FDM channel switching means, all FDM channel signals received from the system users are directed into separate paths through the switching means. The signals in each path are demodulated to baseband, and a destination address in each packet is detected to determine where each packet is to be sent. Each path in the switching means is hard-wired therethrough to an associated transmitting oscillator which is frequency tuned, by means of the detected destination address, to the unique frequency channel of the user or the external network which is desired destination of the packet. Thus, switching of a packet signal is accomplished without ever connecting or disconnecting wire lines.
543081
Darcie Thomas Edward
Gans Michael James
American Telephone And Telegraph Company
Kirby Eades Gale Baker
LandOfFree
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