Common mode noise restrainer applicable to ethernet

A common mode noise restrainer applicable to Ethernet, comprising:

• a circuit side configured to connect with an integrated circuit;
• a cable side configured to connect with a cable, in which the cable side is coupled with the circuit side through four pairs of wires composed of a first pair of wires, a second pair of wires, a third pair of wires and a fourth pair of wires while the second and third pairs of wires are set between the first and fourth pairs of wires;
• a plurality of transformers set between the circuit side and the cable side;
• and
• a plurality of cable-side common mode chokes set between the cable side and the plurality of transformers and coupled with at least the second and third pairs of wires among the four pairs of wires,
• wherein N circuit-side common mode choke(s) is/are set between the circuit side and the plurality of transformers while N is an integer not less than zero;
• if N is zero, at least one pair of wires among the four pairs of wires is coupled with none of the cable-side common mode chokes;
• and if N is greater than zero, one or more cable-side transformer(s) of the plurality of transformers that is/are coupled with the cable-side common mode chokes is/are not identical to one or more circuit-side transformer(s) of the plurality of transformers that is/are coupled with the circuit-side common mode choke(s) or at least one pair of wires among the four pairs of wires is coupled with none of the cable-side and circuit-side common mode chokes.

A common mode noise restrainer applicable to Ethernet, comprising:

• a circuit side configured to connect with an integrated circuit;
• a cable side configured to connect with a cable, in which the cable side is coupled with the circuit side through four pairs of wires composed of a first pair of wires, a second pair of wires, a third pair of wires and a fourth pair of wires while the second and third pairs of wires are set between the first and fourth pairs of wires;
• a plurality of transformers set between the circuit side and the cable side;
• and
• a plurality of circuit-side common mode chokes set between the circuit side and the plurality of transformers and coupled with at least the second and third pairs of wires among the four pairs of wires,
• wherein M cable-side common mode choke(s) is/are set between the cable side and the plurality of transformers while M is an integer not less than zero;
• if M is zero, at least one pair of wires among the four pairs of wires is coupled with none of the circuit-side common mode chokes;
• and if M is greater than zero, one or more circuit-side transformer(s) of the plurality of transformers that is/are coupled with the circuit-side common mode chokes is/are not identical to one or more cable-side transformer(s) of the plurality of transformers that is/are coupled with the cable-side common mode choke(s) or at least one pair of wires among the four pairs of wires is coupled with none of the circuit-side and cable-side common mode chokes.