OPPapers.com Essay Index >> Technology >> Introduction To Cable Modems
We have many free term papers and essays on Introduction To Cable Modems. We also have a wide variety of research papers and book reports available to you for free. You can browse our collection of term papers or use our search engine.
Introduction to Cable Modems. Introduction to Cable Modems The idea behind
cable modems is to allow data communications over existing ...
... Since the introduction of PC's in the late seventies and early eighties, the ... The
wave of the future as far as Internet access is concerned is cable modems. ...
... Cable Modems 1.0 Introduction The Internet is a network of networks that interconnects
computers around the world, supporting both business and residential ...
... DSL Technology By: Tony xDSL Technology Introduction The accelerated growth of ... and
its capabilities provide NSPs with a competitive offering to cable modems. ...
... Motorola changed the way the world communicates, from the introduction of the ... They
offer many different products that range from routers to cable modems. ...
Submitted by Makfull on May 20, 2007
Category: Technology
Words: 10799 | Pages: 44
Views: 200
Popularity Rank: 59,279
Average Member Grade: N/A (Add a Comment / Grade this Paper)
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 of life.
The first operational generation of cable modems were of limited throughput - around the 1 megabit/s level - and there was much discussion of how useful they actually were in real cable networks. Since then the speed and the reliability has improved greatly - the current generation of operational modems, such as from Motorola, work at Ethernet speeds - 10 megabit/s. This sounds really fast, but that is ignoring some of the design features of Ethernet.
Ethernet does not give an actual 100% data throughput - the total throughput is only about 30% of 10 megabit/s, that is, 3 megabit/s. This throughput has to be shared between all the users of cable modems on a given cable TV segment, and there might be 100 of these with, say, 10 using it at a time, so one can expect a usable bandwidth downstream (where one needs high bandwidth) of around 300 kilobit/s. That is still pretty fast compared with ISDN, and likely to be a lot cheaper too - when the...
You must Login to view the entire paper.
If you are not a member yet, Sign Up for free!