Digital And Analogue Cables


I'm confused as to why USB, HDMI, Coax cables are referred to as digital  and RCA as analogue cables.

All of the cables transmitt voltage variation through the wires, so how are they  digital and the other analogue? 

Can someone shed some light on it without manufacturer marketing lingo.

Ag insider logo xs@2xpegolea

Showing 1 response by pegolea

@blisshifi you hit the nail on the head. "Digital cables" transmit packets that are mapped to 0's and 1's with a different voltage levels and those voltage levels vary continuously during the transmission, due to power fluctuation, EMI, and various other influences. RCA single ended interconnect does the same (in all honesty it is questionable whether RCA cables can do sine wave without distortion, no jagged edges), transmits voltage variation. I haven't heard that someone is referring to Ethernet cable as digital, and it does exactly the same thing. It seems that it was pushed through via cable manufacturers to market cables as digital and sell them for digital music easier. In technical terms, probably the closest to a digital cable is optic cable, light=1 no_light=0. Another bone for us HiFi hobbyist to chew on.🫣