Technology
Signal Bandwidth
Quick fact
The bandwidth of a telephone voice signal is only about 3,100 Hz, while a typical Wi-Fi channel occupies 20 MHz—over 6,000 times wider.
Why this is interesting
Ever wonder why a fiber optic cable can download a movie in seconds while a dial-up modem took hours? The answer lies in a deceptively simple idea: how much room a signal has to wiggle.