From Industrial Data Communications 4th Edition
In the text we look at the way data is represented (a set of patterns referred to as "1" or
"0") generally in a set of these patterns called an octet or a byte (or sometimes a character
when referring to text), and we have looked at the abstraction of a model to see the functions
required to move these data representations from one end user to another. We will
now look at another of the fundamentals of communications, the medium over which we
transmit those data representations, the very bottom of the OSI Model, the media. This is the
location where the Physical layer attaches to the outside world, the conduit for information.
All things in data communications are related, and if they are all not correct you do not
communicate very well. Sometimes called pipes, the media is the main constraint on data
transfer speed. There are three types of media in general we will discuss, these are: the
copper types, fiber-optic types, and wireless types. Since this probably covers all media normally
used, that isn't too restrictive. Of the copper types, three generally come to mind in
the LAN and industrial areas: the Unshielded Twisted Pair (UTP),...
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Topics of Interest
In the text we look at the way data is represented (a set of patterns referred to as “1” or “0”) generally in a set of these patterns called an octet or a byte (or sometimes a...
Media Overview Telecommunications cabling installers must be aware of the various types of media (cable) that are available for installation and maintenance. Each type and configuration has specific...
A Common mode termination helps to reduce EMI emissions and susceptibility to EMI by properly terminating common mode energy that can exist on a twisted pair cable. This technique is used for UTP...
5.2 Ethernet Networking The original development of Ethernet LANs was at a data rate of 10 Mbps, using two different types of coaxial cable media. As Ethernet technology evolved and LANs became an...
OVERVIEW Copper cables can be used for both horizontal and backbone media types. Large multipair UTP cables are used for backbone applications. Smaller, four-pair cables are installed for horizontal...