posted on
November 07, 2009 at 06:40PM
Modem is not an antiquated, leftover term. In general, it is a data decoding/encoding bridge device.
Be it an analog to digital phone modem, or a digital broadband cable modem functioning on Rf (radio frequency), or even optical (light) signals via fiberoptics, they are still modems, because they modulate/demodulate the outgoing/incoming signal, be it analog, or digital.
By the way, cable is radio frequencies, not electrical signals transmitted over wires.
The A/D conversion is just the function the early ones performed, and some still do.
They are a couple dozen manufacturers, but most ISPs supply modems to their customers with the service.