Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1977-03-01
1978-06-06
Stewart, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 27FF, 3401461BA, H04J 306
Patent
active
040938255
ABSTRACT:
A data communication system is described in which individual pulses or groups of pulses relating to specific items of information are multiplexed together to produce a pulse stream and this pulse stream is continually repeated so as to reduce the significance of errors in transmission which would be corrected automatically in the next transmission of the pulses relating to the incorrectly transmitted data. The system is described with reference to a data processing system for recording details and charges relating to manually connected telephone calls. Two-way communication between data entry and utilization means and a station control unit is provided in which the data rate for communication from the control unit to the data entry and utilization means is four times higher than that for communication from the data entry and utilization means to the control unit. The control unit includes for received data a persistence checking device in which a change in the incoming data is acted upon only if it is maintained for 16 consecutive frames.
REFERENCES:
patent: 2554886 (1951-05-01), Stedman
patent: 2997540 (1961-08-01), Ertman
patent: 3624307 (1971-11-01), Sikorsky
patent: 3646274 (1972-02-01), Nadil
patent: 3838225 (1974-09-01), Limberg
patent: 3863215 (1975-01-01), McGrogan
patent: 3937892 (1976-02-01), Bloch
patent: 3978457 (1976-08-01), Check
patent: 4009566 (1977-03-01), Ho
Transmission Systems for Communications; Staff, Bell Telephone Laboratories; copyright 1970; pp. 555-556.
Gladstone David John
Moldram Peter Andrew
Post Office
Stewart David L.
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