Patent ID: 8008986
Filing Date: 2011-08-30
Classification: G01R,H04Q

Abstract:
1. A coupling unit for coupling a voltage signal to and/or from a cable including a plurality of twisted pairs, the coupling unit comprising: a first electrode and a second electrode arranged to produce an electric field therebetween to couple a voltage signal to the cable by non-contact coupling with the twisted pairs so that the voltage signal propagates along the cable between at least two of the twisted pairs and/or arranged to receive a voltage signal which has propagated along the cable between at least two of the twisted pairs by non-contact coupling with at least two of the twisted pairs between which the voltage signal has propagated; and a voltage signal coupling means for coupling a voltage signal generated by a voltage signal generator to the electrodes and/or for coupling a voltage signal received by the electrodes to a voltage signal processor; wherein the voltage signal coupling means includes electrical isolation means arranged to electrically isolate the electrodes of the coupling unit from the voltage signal generator and/or the voltage signal processor.