The bandwidth of a channel carrying digital data is usually measured in
bits per second (bps). For example, your wireless LAN might be rated for
an average speed of 27 Mbps. The bandwidth of a channel carrying analog
data is typically measured in hertz (Hz). For example, the copper wires that
carry voice-grade telephone signals are often described as having 3,000
Hz bandwidth.
High-bandwidth communications systems, such as cable TV and DSL, are
sometimes referred to as broadband, whereas systems with less capacity,
such as dial-up Internet access, are referred to as narrowband. Broadband
capacity is essential for networks that support many users, and those that
carry lots of audio and video data, such as music and movie downloads.
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