ch03_CE - Guide to Networking Essentials Fifth Edition...

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Unformatted text preview: Guide to Networking Essentials Fifth Edition Chapter 3 Networking Media Guide to Networking Essentials, Fifth Edition 2 Objectives Identify general cabling characteristics applied to physical media Describe the primary cable types used in networking Identify the components in a structured cabling installation Describe wireless transmission techniques used in LANs and WANs Guide to Networking Essentials, Fifth Edition 3 Network Cabling: Tangible Physical Media The interface between a computer and the medium to which it attaches defines the translation from a computers native digital information into the form needed to send outgoing messages Because all media must support the basic tasks of sending and receiving signals, you can view all networking media as doing the same thing; only the methods vary You need to know the physical characteristics and limitations of each kind of network media so that you can make the best use of each type Each has a unique design and usage, with associated cost, performance, and installation criteria Guide to Networking Essentials, Fifth Edition 4 General Cable Characteristics The following characteristics apply network cabling: Bandwidth rating Maximum segment length Maximum number of segments per internetwork Maximum number of devices per segment Interference susceptibility Connection hardware Cable grade Bend radius Material costs Installation costs Guide to Networking Essentials, Fifth Edition 5 Baseband and Broadband Transmission Baseband transmission uses a digital encoding scheme at a single fixed frequency, where signals take the form of discrete pulses of electricity or light Repeaters can be used to deal with attenuation Broadband transmission systems use analog techniques to encode binary 1s and 0s across a continuous range of values Multiple analog transmission channels can operate on a single broadband cable Amplifiers can be used to deal with attenuation Two primary approaches: mid-split and dual-cable Guide to Networking Essentials, Fifth Edition 6 The Importance of Bandwidth The trend in networking is to offer more complex, comprehensive, and powerful services These require much higher bandwidth Users demand access to these applications and have increased their use of existing networked applications, consuming still more bandwidth Technologists find ways to stretch bandwidth limits of existing technologies so that older, difficult-to- replace networking components can remain, yet support higher bandwidth than originally rated Guide to Networking Essentials, Fifth Edition 7 Primary Cable Types All forms of cabling are similar, in that they provide a medium across which network information can travel in the form of a physical signal, whether electrical or light pulses The primary cable types are: Coaxial cable Twisted-pair Fiber-optic cable Guide to Networking Essentials, Fifth Edition...
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This note was uploaded on 06/08/2011 for the course COMPUTER CGS2100 taught by Professor Sanders during the Spring '09 term at Florida State College.

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ch03_CE - Guide to Networking Essentials Fifth Edition...

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