Secondary channel method and apparatus

Details Secondary channel method and apparatus Secondary channel method and apparatus

H - Electricity

04

L

340/71

H04L 1/00 (2006.01) H04B 17/00 (2006.01) H04L 1/24 (2006.01) H04L 5/14 (2006.01) H04L 5/20 (2006.01)

Patent

CA 1213649

ABSTRACT A secondary data channel is described for use in a four-wire communication system in which there is continuous wire between each of two coupling transformers at a first station and each of two coupling transformers at a second station. In accordance with the invention, the transformer windings at each station that are connected to the transmission line wires are equipped with center taps that are connected to a secondary channel data set. By these means a secondary data signal can be transmitted from one station to another by applying a signal to the center taps of the two coupling transformers at one station and receiving such signals from the center taps of the two coupling transformers at the other station.

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