Multiplex communications – Wide area network – Packet switching
Patent
1988-09-12
1990-04-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 951, 455 32, 455 34, 34082544, H04Q 700
Patent
active
049146491
ABSTRACT:
A multiple frequency message system includes a transmitter for transmitting coded message signals on a plurality of channels of which at least one channel to be assigned to each of a plurality of geographical areas. The coded message signals include channel identification information and message information being transmitted in a sequence of coded transmission slots on each of the plurality of channels. The sequence of coded transmission slots are transmitted offset in time such that a particular transmission slot is not simultaneously transmitted on any of the plurality of channels in each geographical area.
A receiver capable of receiving the coded message signals during a predetermined coded transmission slot being transmitted on the plurality of channels is also provided. The receiver includes a channel selecting circuit responsive to the detected channel identification information during the predetermined transmission slot for maintaining operation on a predetermined channel or, for sequentially receiving the predetermined transmission slot on each of the plurality of channels.
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A Standard Code for Radiopaging-a report of the Studies of the British Post Office Code Standardisation Advisory Group (POCSAG)-copyright the British Post Office, 1978/1979.
New Radio Paging System by M. Komura, A. Yokokura, T. Hagihira & M. Ogasawara published Jul., 1977.
The Application of Coding Techniques to Radiopaging by R. H. Tridgell, published 3/1980 in the Proceedings of the Swiss Federal Institute of Technology.
Schwendeman Robert J.
Willard David F.
Hsu Alpus H.
Ingrassia Vincent B.
Macnak Philip P.
Motorola Inc.
Olms Douglas W.
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