Method and apparatus for testing the tip-ring polarity of teleph

Details Method and apparatus for testing the tip-ring polarity of teleph Method and apparatus for testing the tip-ring polarity of teleph

1978-07-20

1980-06-24

Brigance, Gerald

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

17917525, 324133, H04M 124

Patent

active

042096715

ABSTRACT:
A method and apparatus for testing the tip-ring polarity of telephone receptacles connected in parallel to a non-working pair includes a battery and an LED, the device being capable of being plugged into a subscriber's telephone receptacle. When a diode is properly placed across the non-working pair, the LED will light if the final terminals of the receptacle are wired with the correct tip-ring polarity. The disclosure teaches that the diode may be incorporated in various types of packages and may be connected across the non-working pair in several different ways.

REFERENCES:
patent: 2956229 (1960-10-01), Henel
patent: 3600678 (1971-08-01), Garrett et al.
patent: 3711661 (1973-01-01), Garrett et al.
patent: 3766335 (1973-10-01), Longstaff et al.
patent: 3790790 (1974-02-01), Norman
patent: 3806803 (1974-04-01), Hall
patent: 3976849 (1976-08-01), Champan
Polarity tester for two-wire serial loop communications system, IBM Technical Disclosure Bulletin vol. 17, #5, Oct. 1974, Palouner & Skatrud.

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