Is coax cable, the basic wire in every home, a digital or analog wire?
Coaxial cable can carry electrons at high speed and those electrons can be used by either digital or analog systems, depending on how they were sent and how they are decoded. It is only a transmission medium; how we transmit through it is up to us. It’s features work well for both analog and digital signals, although like most transmission media, 50% (average) duty cycle signals usually transmit with fewer errors. While most transmission media can’t be classified analog or digital, fiber optics come the closest. Originally designed to transmit light pulses (not constant beams), it is optimized for digital transmission — but, with the correct transmitter and receiver circuits, it can be used to transmit non-digitized analog signals.
