@pegolea Digital cables transmit a digital, binary signal (0’s and 1’s) before a digital to analog converter (DAC) converts the signal into an analog signal.
Generally different types of digital cables have required specifications to enable the effective delivery of the digital signal to its destination. Coax, for example needs to have a 75ohm impedance while AES (digital XLR) needs to be a 110ohm impedance cable.