Communication system capable of interruption talk during data tr

Details Communication system capable of interruption talk during data tr Communication system capable of interruption talk during data tr

1987-06-25

1988-10-25

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

455 54, 455 58, H04Q 700, H04B 100

Patent

active

047807156

ABSTRACT:
A communication system may perform talking and data transmission by a polling process which are carried out between a plurality of terminal units and a central control station. The system is capable of interruption talk during data transmission. The central control station is provided with time slots for use in interruption, which is given at appropriate time intervals in the polling process. Thus, until the predetermined polling is finished, the central control station repeats the steps of (i) generating interruption acceptance signals at appropriate intervals in the polling mode, (ii) thereafter giving a plurality of time slots for receiving the interruption signals from the terminal units, and (iii) when interruption signals from the terminal units are received in the plurality of time slots, returning to the talk mode by generating a polling finish signal and terminating the polling or by simply terminating the polling. When interruption signals are not received, the polling is continued. The terminal units may demand to switch to talking while in the polling mode. A plurality of slots are independently timed with the central control station after receiving the interruption acceptance signal from the central station. The terminal unit selects a random one of the slots and sends an interruption signal through such slot. Thus, the talk and the data transmission by the polling process are realized in the same channel.

REFERENCES:
patent: 4131849 (1978-12-01), Freeburg et al.
patent: 4430742 (1984-02-01), Milleker et al.
patent: 4477809 (1984-10-01), Bose
patent: 4517561 (1985-05-01), Burke et al.
patent: 4553263 (1985-11-01), Smith et al.
patent: 4554677 (1985-11-01), Smith et al.
patent: 4573207 (1986-02-01), Smith et al.

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