The embodiment of the invention discloses communication equipment, a system and a method. The communication equipment comprises a communication transformer connected with communication cables, an interference cut-down module, a communication transformer, a communication processor and the like, wherein the interference cut-down module is arranged at the at least one end of the output end and the input end of the communication transformer for performing interference cut-down processing for interference signals of interference data transmission. The system comprises at least two pieces of communication equipment for communicating through the communication cables. The method comprises that: the communication equipment receives data transmitted from opposite end equipment through the communication cables, and the interference cut-down module device cuts down the interference current flowing into the communication transformer through the communication cables. The equipment, the system and the method of the embodiment of the invention perform interference cut-down processing on the interference signals of data transmission between the interference communication equipment.