1.Conductor:soft round copper wire 0.32,0.4,0.5,0.6,0.7,0.9mm in diameter.
2.Insulation:insulation material is consecutive solid high-desity polyethylene with 10 color to choose,for easy recognition.
3.Line pairs:every 2 insulation conductors strands into pair,according to the assigned chromatogram
4.Carry analogue signal transmission of audio frequency 150 KHz or less,digital signal about 2048 Kbit/s.