Dalian weak cable refers to the cable used for security communications, electrical equipment and related weak current transmission. There is no strict line between "wire" and "cable". The products with small core number, small diameter and simple structure are called wires, without insulation called bare wires, others are called cables. The larger section of the conductor (more than 6 square millimeters) is called a large wire, the smaller (less than or equal to 6 square millimeter) is called a small wire, and the insulated wire is also called a cloth wire.

Dalian weak cable consists of inner conductor, insulation, outer conductor and sheath.

Internal conductor: because the attenuation is mainly caused by the resistance of the inner conductor, the inner conductor has great influence on the signal transmission.

Insulation: attenuation, resistance and return loss.

Outer conductor: circuit conductor, shielding effect