Method of operating a communication system

Details Method of operating a communication system Method of operating a communication system

1995-12-12

1997-06-10

Kizou, Hassan

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

370310, 395287, H04L 12407, H04L 12427

Patent

active

056383789

ABSTRACT:
A communications system is described having a number of communicating units arranged for communication over a common communications channel. A first communicating unit (10) transmits a data transmission (104) followed by an end-of-data indication (102) and a predetermined period of further transmission activity (101) to a second communicating unit (12). During the period of further transmission activity (101) of the first unit, the second unit seizes the channel (103) and transmits a preamble (105) prior to its response data. This process continue ensuring that periods of further transmission activity (101) and the preamble (105) keep the channel open for the duration of the communication, for sole use by the communicating units. The invention is applicable to, but not limited to use in supervisory control and acquisition-of-data (SCADA) systems.

REFERENCES:
patent: 5086507 (1992-02-01), Mela
patent: 5436901 (1995-07-01), Koopman
patent: 5481541 (1996-01-01), Gareh et al.

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