December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 4: Physical Layer Concepts 147
21. What else do I need to know about analog vs. digital communications?
For one thing, there is often some confusion about the “speed” or capacity of a com-
munications channel and the terms used to describe it.
22. Such as?
Well, for starters, how about bandwidth?
23. Okay. What is bandwidth?
In analog communications, bandwidth is the total capacity of a communications chan-
nel. It is the difference between the highest and lowest frequencies capable of being carried
over a channel. The greater the bandwidth, the more signals that can be carried over a given
frequency range. For example, typical voice-grade lines ...
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