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Chapter 17. How a Modem (Really) Works > Bandwidth: Voiceband and Broadband

Bandwidth: Voiceband and Broadband

Voiceband

This refers to the transmission of (voice) information over a relatively narrow band of frequencies, called the voice spectrum (about 0–3,500 Hz), for which telephone networks have been designed. Your dialup 56-Kbps modem is an example of a voiceband modem. For the sake of the scope of this chapter, voiceband technologies discussed include dialup 56-Kbps analog modems, modem doubling, and ISDN; broadband technologies will include cable, DSL, and satellite Internet access.

Broadband

This is the buzzword you've been hearing a lot about. You might not know what it is, but you've probably heard of it. Broadband covers a “wider” band of frequencies than voiceband by:


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