Line Wiring for Polarity-Sensitive Telephones


Some telephones are polarity sensitive due to internal circuitry. For instance, some electret replacement transmitters are polarity sensitive. The drawings below show the wiring from a correctly wired wall outlet to a telephone. Also shown is wiring for a straight-through extended cable with polarity sensing diodes to make sure all the connections are correct.

RJ11 and RJ14 Connector, Wiring, and Colors

RJ Connector
Wiring Color and Polarity

Straight-Through Extender and Polarity Tester

Wiring Extender and Polarity Tester Schematic Diagram

Copyright Dale Thompson,
31 August 2015 through
last revision on 31 August 2015