Computer Networking and Management Lesson 1



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Computer Networks and Internet - Overview
Things to Remember:
HFC: hybrid fiber coax Asymmetric up to 10Mbps upstream, 1 Mbps downstream Network of cable and fiber attaches homes to ISP router l
Shared access to router among home l
Issues: congestion, dimensioning Deployment available via cable companies, e.g.,
MediaOne Computer Networking and Management
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Cable Data Network Architecture To offer high -speed Internet services, a cable operator creates a data network that operates over its hybrid fiber/coax (HFC) plant. The following diagram provides a high -level look at atypical large market cable network, including a regional cable headend (typically serving 200,000 to 400,000 homes, which feeds distribution hubs (each serving 20,000 to 40,000 homes) through a metropolitan fiber ring. At the distribution hub, signals are modulated onto analog carriers and then transported over fiber-optic lines to nodes serving
500 to 1,000 homes. From the node, these signals are carried via coaxial cable to a home or business. Computer Networking and Management
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Source http://www.cabledatacomnews.com/cmic/diagram.html

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