H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
340/90
H04Q 7/00 (2006.01) H04M 3/20 (2006.01)
Patent
CA 1274597
71993-1 ABSTRACT OF THE DISCLOSURE A system for performing talk and data transmission by a polling process between terminal units and a central station, which system is capable of interruption talk during data transmis- sion, is described. The central station is provided with slots for use in interruption given at appropriate time intervals in the polling process. Thus the central station is given, as one of its functions, the function of until the predetermined polling is finished, repeating steps of (i) generating interruption accept- ance signals at appropriate intervals in the polling mode, (ii) giving thereafter a plurality of time slots for receiving the interruption signals from the terminal units, and (iii) when inter- ruption signals from the terminal units are received in the plural- ity of time slots, returning to the talk mode by generating a polling finish signal and terminating the polling or simply ter- minating the polling, and when not received, continuing the polling. The terminal units are given, as one of their functions, the function of when occasion demands to do talk in the polling mode, either manually or automatically, assuming a plurality of slots timed with the central station, independently after receiving the interrupt acceptance signal from the central station, electing at random one of the slots and sending an interruption signal through such slots. Thus the talk and the data transmission by the polling process are realized in the same channel. NEC/10989/85/CA
500354
Corporation Nec
Smart & Biggar
LandOfFree
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