Patent ID: 9363067
Filing Date: 2016-06-07
CPC Classification: H04L

Claim Text:
1. An apparatus suitable to receive and transmit respective forward channel and back channel data signals simultaneously through an interface to a common conductor pair, comprising: first and second coupling capacitors for interfacing to the common conductor pair; a composite differential signal path coupled through the coupling capacitors to the interface to the common conductor pair to convey forward channel and back channel data signals simultaneously as a composite data signal; a forward channel differential signal path coupled to receive the forward channel data signals through differential summing nodes that are isolated from said composite differential signal path, and to convey said forward channel data signals; forward channel receiver circuitry coupled to said forward channel differential signal path to receive said forward channel data signals; back channel differential signal driver circuitry coupled at a differential output to said composite differential signal path and responsive to an encoded data signal at a differential input to provide said back channel data signal; and isolation circuitry coupled between said composite differential signal path and said forward channel differential signal path at said differential summing nodes, to perform signal isolation to couple the forward channel data signals from said composite differential signal path to said forward channel differential signal path, through said differential summing nodes, while substantially blocking back channel data signal energy from said forward channel differential signal path, said isolation circuitry including: