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Easy, look it up and when you find out the answer tell me............... http://hubpages.com/hub/Data-Communication
Physical media is a type of communication medium. Mostly thought in information technology classes
none of protocols include a physical layer specification
There are many physical barriers to communication such as a speech impediment. Other physical barriers to communication include the inability to speak or hear.
Various media are used for data communication. Communication media refers to the means of delivering and receiving data or information. In telecommunication, these means are transmission and storage tools or channels for data storage and transmission.
Context is the physical or social setting of communication.
How do hosts on a physical ring topology communication