Telephone line status indicator

Details Telephone line status indicator Telephone line status indicator

1974-11-01

1976-03-16

Claffy, Kathleen H.

179 1MN, H04M 322

Patent

active

039447529

ABSTRACT:
A device for indicating the status of one or more individual telephone lines with respect to whether the receiver is off hook or ringing without the necessity of dialing the line. A light-emitting diode and a neon lamp are positioned adjacent a discrete aperture visible to a user. The light-emitting diode responds to the presence of 24-volt normal tip line current, and is protected by a Zener diode against dial pulse currents employing ringing voltage. The neon lamp, in conjunction with a condensor carries the ringing current, and is so positioned adjacent the light-emitting diode that a glow in the neon tube is made to appear as an illumination of the light-emitting diode, whereby both bosy conditions appear to be indicated on the same light source.

REFERENCES:
patent: 3469036 (1969-09-01), Meri
patent: 3842216 (1974-10-01), Owen et al.

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