Uses Modulation and Demodulation to convert digital signals to analog signals that can be transferred over a network that was not designed for carrying data
Dial Up Modem, DSL Modem
The signal that comes into our houses from our ISP is analog in nature
A modem converts Analog signals to Digital signals
Channels E.g. 8x4 (8 Downstream, 4 Upstream)
Cable Modem
Segregates the TV signal and the network signal and sends network signal to the router