Electricity: measuring and testing – Conductor identification or location
Patent
1987-12-02
1990-02-13
Eisenzopf, Reinhard
Electricity: measuring and testing
Conductor identification or location
324540, 324539, G01R 19145, G01R 3102
Patent
active
049010034
ABSTRACT:
Telecommunications (e.g. ISDN) wiring is tested by sequentially supplying to each wire at a first location a pulse sequence identifying that wire while connecting to a common potential other wires, and detecting pulses on the wires at a second location while simultaneously providing a return path connection for the pulses to the other wires. The return path connection is provided by connecting between each wire and a local ground at the second location a resistor and a diode poled to be reverse biassed by pulses on the wire. The detected pulses are counted and the result used to drive a LED (light emitting diode) display comprising N green LEDs indicating correct wiring and N(N-1) red LEDs indicating incorrect connections, the LEDs being arranged in an N by N array with the green LEDs along one diagonal.
REFERENCES:
patent: 3217244 (1965-11-01), Glover
patent: 3742350 (1973-06-01), White
patent: 3976849 (1976-08-01), Champan
patent: 4418312 (1983-11-01), Figler et al.
patent: 4533864 (1985-08-01), Austin
Eisenzopf Reinhard
Haley R. John
Harvey Jack B.
Northern Telecom Limited
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