Switchable incremental attenuation for telephone line interface

Electrical resistors – Incased – embedded – or housed – Element in insulation with outer metallic sheath

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Details

338200, 338221, 333 81A, H04M 176

Patent

active

044423250

ABSTRACT:
A self-contained switchable, incremental attenuator device for interposing in a two line power circuit to attenuate the power level for proper power matching. The device includes a series of modulized, individually switchable attenuator circuits of differing attenuation values mounted upon a pluggable card for interfacing with input and output connectors of a circuit. The attenuation values of the sections are selected such that manipulating the switches will allow attenuation of the power level in the circuit by an integral multiple of a given base incremental value within a given range. The attenuator device is designed to mate with a mounting device for holding the attenuator in contact with the circuit connectors.

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patent: 4086548 (1978-04-01), Robbins et al.
patent: 4138637 (1979-02-01), Weinert
patent: 4146853 (1979-03-01), Kiyono et al.
patent: 4216444 (1980-08-01), Vergnolle et al.
patent: 4220834 (1980-09-01), Holce et al.
patent: 4330765 (1982-05-01), Patukonis
patent: 4354159 (1982-10-01), Schorr

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