Protection module and decoupling component thereof for symmetrical twisted pairs

A protection module for symmetrical twisted pairs, comprising:

• an input interface, having a positive input terminal and a negative input terminal;
• an output interface, having a positive output terminal and a negative output terminal;
• a ground interface, having a ground terminal;
• a first protection element;
• a decoupling component, having an inductor, a first resistor, a second resistor, a first contact, a second contact, a third contact, a fourth contact and a fifth contact, wherein resistances of the first and second resistors are not changed as currents flowing through the first and the second resistors vary, the inductor and the first resistor are coupled in series between the third contact and the fourth contact, the inductor and the second resistor are coupled in series between the third contact and the fifth contact, the first contact is located between the inductor and the first resistor and directly connected to both of the inductor and the first resistor, the second contact is located between the inductor and the second resistor and directly connected to both of the inductor and the second resistor, the first contact is coupled to the positive input terminal through a first transmission line, the second contact is coupled to the negative input terminal through a second transmission line, the third contact is coupled to the ground terminal through a third transmission line and the first protection element, the fourth contact is coupled to the positive output terminal through a fourth transmission line, and the fifth contact is coupled to the negative output terminal through a fifth transmission line;
• and
• a second protection element, being coupled between the fourth transmission line and the fifth transmission line and being closer to the output interface than the first and second resistors.