Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-05-14
1981-05-05
Wolff, John H.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340147R, H04M 1100
Patent
active
042660971
ABSTRACT:
The disclosed energy control system employs the serving electronic stored program PBX to regulate the operation of energy consuming devices located throughout a hotel/motel or office building in accordance with one or more modes of operation as offered by an algorithm stored in the PBX memory. This is accomplished by equipping each guest room or office with a control circuit to regulate the operation of the energy consuming devices located in that room. These control circuits are activated by the presence of an audio frequency tone on the telephone line associated with the room. To minimize the impact of this scheme on the traffic capacity of the PBX time division switching network, all activated control circuits are concurrently connected to a single time slot, which supplies the required audio frequency tone.
REFERENCES:
patent: 3548102 (1970-12-01), Schaum et al.
patent: 3702904 (1972-11-01), Bard
patent: 3865984 (1975-02-01), Ewing
patent: 4021615 (1977-05-01), James et al.
patent: 4072825 (1978-02-01), McLay et al.
Cannon Thomas B.
Dalley James E.
George Andrew S.
Bell Telephone Laboratories Incorporated
Graziano James M.
Popek Joseph A.
Wolff John H.
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