Patent ID: 9729357
Date: 2017-08-08
CPC Classifications: H03F,H04B,H04L,H04N,Y10T

Claim:
1. A system for transmitting control signals over twisted pair cabling, comprising: a first processor transmitting a first single ended signal and receiving a second single ended signal; a first differential transmitter coupled to the first processor, the first differential transmitter receiving the first single ended signal from the first processor and converting it to a differential signal over a first differential line and a second differential line; a first differential receiver coupled to the first processor, the first differential receiver receiving a third differential line and a fourth differential line and converting a second differential signal received over the third differential line and the fourth differential line to a differential receiver signal, the differential receiver signal coupled to the second single ended signal; and a first transformer having first, second, third, and fourth center-tapped coils, the first differential line coupled to the center tap of the first coil, the second differential line coupled to the center tap of the fourth coil, the third differential line coupled to the center tap of the second coil, and the fourth differential line coupled to the center tap of the third coil, whereby the common mode of the first transformer is used to transmit a first control signal and to receive control signal responses over the twisted pair at the first processor.