Method and apparatus for communicating variable length messages between a primary station and remote stations of a data communications system
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United States of America Patent
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-
May 21, 1985
Grant Date -
N/A
app pub date -
Jul 11, 1983
filing date -
Jul 11, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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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