Polling system for multiple terminal units

Details Polling system for multiple terminal units Polling system for multiple terminal units

1981-12-04

1984-08-14

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082552, 34082547, H04Q 900

Patent

active

044660014

ABSTRACT:
A semi-duplex communication system provides high channel efficiency by having the base station transmit a reference signal which each terminal uses as a sync signal. Each unit having data to send to the base responds with a very brief signal such as a burst of silent carrier transmission during an assigned time slot in a queue of slots. Only those units which responded thus are polled during the subsequent polling cycle. During the transmission time slots, the base can be sending acknowledgments to those terminal units having sent messages during the previous polling cycle. While polling for data or acknowledgments or sending acknowledgments, the base can also be listening for the respective responses. The address code of a terminal unit is further encoded to carry other required information in both directions.

REFERENCES:
patent: 3801956 (1974-04-01), Braun et al.
patent: 3855576 (1974-12-01), Braun et al.
patent: 4103286 (1978-07-01), Nicolini et al.
patent: 4151367 (1979-04-01), Nicolini et al.
patent: 4208650 (1980-06-01), Horn
patent: 4251865 (1981-02-01), Moore et al.
patent: 4281315 (1981-07-01), Bauer et al.
Patent Application Ser. No. 967,762, filed 12/8/78 by Applicant Bass, Robert H. et al.

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