A modem is a computer-to-computer communication device that converts digital signals from the computer to analog signals for the telephone lines. The word “modem” comes from the two operations it handles:
modulation
demodulation
modulation The process on changing the digital signal to an analog signal on the sending computer.
demodulation The process of converting the analog signal back to a digital signal on the receiving computer.
Cable is used to connect network devices. There are many types of networking cable in use today. Different types of cable have particular strengths and weaknesses, most notably in the speed at which they can transfer information.