A power and communication system for providing differential data and DC power on a wire pair comprising: a DC power supply having a positive voltage terminal and a negative voltage terminal; an isolation transformer having a primary winding, a first secondary winding, and a second secondary winding, wherein the positive voltage terminal of the power supply is coupled to a first end of the first secondary winding, and wherein the negative voltage terminal of the power supply is coupled to a first end of the second secondary winding, wherein the first end of the first secondary winding and the first end of the second secondary winding form a split center tap of a secondary side of the transformer; a transceiver coupled across the primary winding for transmitting and receiving differential data signals via the transformer and the wire pair, wherein a second end of the first secondary winding is configured to be coupled to a first wire of the wire pair, and a second end of the second secondary winding is configured to be coupled to a second wire of the wire pair, such that the first secondary winding and the second secondary winding conduct DC power to the wire pair and also conduct differential data signals; and characterised by having an RC termination circuit coupled between the power supply and the secondary side of the transformer, the RC termination circuit comprising: a resistor having a first end coupled to a reference voltage; a first capacitor coupled between the first end of the first secondary winding and a second end of the resistor; and a second capacitor coupled between the first end of the second secondary winding and the second end of the resistor. a DC power supply having a positive voltage terminal and a negative voltage terminal; an isolation transformer having a primary winding, a first secondary winding, and a second secondary winding, wherein the positive voltage terminal of the power supply is coupled to a first end of the first secondary winding, and wherein the negative voltage terminal of the power supply is coupled to a first end of the second secondary winding, wherein the first end of the first secondary winding and the first end of the second secondary winding form a split center tap of a secondary side of the transformer; a transceiver coupled across the primary winding for transmitting and receiving differential data signals via the transformer and the wire pair, wherein a second end of the first secondary winding is configured to be coupled to a first wire of the wire pair, and a second end of the second secondary winding is configured to be coupled to a second wire of the wire pair, such that the first secondary winding and the second secondary winding conduct DC power to the wire pair and also conduct differential data signals; and characterised by having an RC termination circuit coupled between the power supply and the secondary side of the transformer, the RC termination circuit comprising: a resistor having a first end coupled to a reference voltage; a first capacitor coupled between the first end of the first secondary winding and a second end of the resistor; and a second capacitor coupled between the first end of the second secondary winding and the second end of the resistor. a resistor having a first end coupled to a reference voltage; a first capacitor coupled between the first end of the first secondary winding and a second end of the resistor; and a second capacitor coupled between the first end of the second secondary winding and the second end of the resistor.