Telephone line status indicator
AssigneePorta Systems Corp.
InventorsTheodore Stearn, Paul V. De Luca
Life of this patent
Estimating the term…
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.
Claims4
An improved telephone line status indicator adapted to be connected to the tip and ring circuits of a telephone line to indicate the presence of tip and ring currents, comprising:
- a light-emitting diode, a Zener diode connected in parallel with said light-emitting diode, said light-emitting diode and Zener diode being connected in series with said tip circuit;
- a neon lamp in series with said ring circuit;
- and means for supporting said neon lamp and light-emitting diode for display in juxtaposed relation.
Dependencies are inferred from the claim text.