Use. The clock line is the line that provides the clock signal of the cd turntable connected to the decoder, and it is the reference time sequence for communication with the devices on the bus, while the cd audio coaxial line is the coaxial cable used to transmit the audio signal of the cd turntable, which have different functions and are indispensable. Therefore, the CD turntable connected to the decoder uses both the clock line and the coaxial line. The turntable refers to the mechanical part of the CD. In a single disc, it refers to the movement, and in a split CD, it includes power supply, servo and other circuits.