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Introduction to Cable Modems

The idea behind cable modems is to allow data communications over existing cable TV systems, without requiring a wholesale replacement of the cable TV infrastructure. In reality, some modification of the infrastructure is required - such as for junction boxes - but normally operators can avoid any mass re-laying of cables.
Cable modems in fact can trace their history to the early days of Ethernet, when broadband Ethernets were being developed. These never became popular in the marketplace but the ideas have now been revamped. The original simple ideas about cable modems derived from Ethernet were not much good in reality because the electromagnetic environment within an existing cable TV system is very noisy and there is limited bandwidth available for upstream communications (set-top to head-end). But some expert developers have now got involved, many from backgrounds of experience in radio, cellular or military communications where noise is a fact......

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Approximate Word Count: 10799
Approximate Pages: 44 (250 words per double-spaced page)

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