Multiplex communications – Wide area network – Packet switching
Patent
1994-06-10
1996-09-17
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 582, 370 66, 370 953, 379 58, 455 331, 455 541, H04B 7204
Patent
active
055576060
ABSTRACT:
A land mobile radio communication system has a plurality of cell sites, each of which typically has a plurality of repeaters. The over-the-air radio communications between the cell site repeaters and the mobile radios in the system include both a voice component and a data component. The data component is carried as low-frequency subaudible information. Communication channels are provided between the radio users at each site as well as between users at different sites and between mobile radio users and the public telephone network. Within a cell site, the transmitted and received communications are digitized and passed through serial buses in a time multiplex fashion. The digitized voice is transferred between time slots to provide the required switching function. The system includes operational software to provide direct inward dial telephone number recognition, automatic voice prompts for a user entering a new cell, call priority override, fraud control for radio fleets and a dynamic control channel.
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"Extended Sub-Audible Signalling" Uniden Product Announcement Brochure, Mar. 1993.
Moon Billy G.
Nguyen Cap V.
Blum Russell W.
Olms Douglas W.
Uniden America Corporation
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