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 149
works. Although some noise is always present, much of it can be avoided through proper
cable installation.
30. That was interesting. Are you going to make noise about anything else?
Yes, there’s one more type of noise we’ll touch on briefly: intermodulation noise. Fre-
quency division multiplexing, a concept we will discuss later, mixes multiple frequencies
of data transmission on a single transmission medium. Intermodulation noise occurs when
two of the frequencies interact to produce a phantom signal at a different frequency, which
can be either the sum or the difference of the two original frequencies. For e ...
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