Interface circuit and communication device

An interface circuit, comprising:

• at least two transformer units;
• a protection unit, wherein a first terminal of the protection unit is connected with center taps of primary sides of the at least two transformer units, and a second terminal of the protection unit is grounded;
• and
• at least two interface units, wherein a first access terminal of the interface unit is connected with a first port of the primary side of the transformer unit, a second access terminal of the interface unit is connected with a second port of the primary side of the transformer unit, and a third access terminal and a fourth access terminal of the interface unit are electrically connected with the first terminal of the protection unit.

A communication device, comprising a printed circuit board, wherein the printed circuit board comprises a chip and an interface circuit, and the interface circuit comprises:

• a transformer unit, wherein a secondary side of the transformer unit is connected with the chip;
• a protection unit, wherein a first terminal of the protection unit is electrically connected with a center tap of a primary side of the transformer unit, and a second terminal of the protection unit is grounded;
• and
• an interface unit, wherein a first access terminal of the interface unit is connected with a first port of the primary side of the transformer unit, a second access terminal of the interface unit is connected with a second port of the primary side of the transformer unit, and a third access terminal and a fourth access terminal of the interface unit are electrically connected with the first terminal of the protection unit.