Multiplex communications – Wide area network – Packet switching
Patent
1983-07-11
1985-05-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, 3701101, H04J 316
Patent
active
045190682
ABSTRACT:
A data communications system is described in which variable length messages are communicated between a general communications controller (GCC) and a plurality of portable and mobile radios. The variable length messages include a bit synchronization field, a message synchronization field and a plurality of channel data blocks for efficiently and reliably handling long strings of data or text. Each channel data block includes an information field, a parity field for error-connecting the information field and a channel state field indicating whether or not the radio channel is busy or free. The GCC is coupled to a cellular arrangement of channel communications modules (CCM's), which each include a radio transmitter and/or radio receiver. The mobile and portable radios communicate with the GCC by way of the CCM's.
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Freeburg Thomas A.
Krebs Jay
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Olms Douglas W.
Roney Edward M.
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