Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1996-01-16
1997-08-26
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 21, H04L 908
Patent
active
056618026
ABSTRACT:
A telephone and auxiliary power distribution system in a building has a flexible multi-conductor signal and power distribution cable; which cable originates from a central signal & power management facility located near the point where the telephone utility line enters the building and extends from there to each of numerous locations within the building at which a fire-hazard-proof signal & power outlet is wanted; each of which outlets is adapted to service one of plural different loads, such as a wide variety of telephone and telephone-related instruments, smoke detectors, PC's, TV's & VCR's, clocks and timers, thermostats, door chimes and buttons, modems, fax machines, lamps & lights, Class-2 & Class-3 sub-circuits, etc. The central signal and power management facitility, which is connected with the telephone utility line, the electric utility power line, the gas utility gas supply line and a water supply line, serves: (i) to connect the telephone utility line with the signal and power distribution cable; (ii) even during periods of electric utility power failure, to provide various conditioned DC voltages to various pairs of power conductors within the distribution cable; (iii) to detect the presence of any unauthorized (e.g., fire-hazardous) loads connected with the power conductors; and (iv) to remove the voltage from a pair of conductors if an unauthorized load be connected therewith.
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patent: 4390898 (1983-06-01), Bond et al.
patent: 4833710 (1989-05-01), Hirashima
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