Abstract

This chapter discusses the different types of transmission media used for physically conveying signals from one point to another. It explains the fundamental method of operation of each of these transmission media types, introduces the various system components, and discusses the application for each type. Some of the main bearer design considerations are discussed to enable the reader to make an informed decision as to which type of media to use for a particular application. The discussion begins with systems guided over a physical bearer; namely twisted pair and coaxial copper, fiber-optic cables, and the power distribution system. Twisted-pair cable is widely used, andit can transmit data at an acceptable rate—up to 100 Mbps in some network architecture. Coaxial cable is used for radio frequency and data transmission. The cable is remarkably stable in terms of its electrical properties at frequencies below 4 GHz and this makes the cable popular as the connection between a radio and its antenna. In addition, wireless systems, namely, microwave radio systems, satellite systems, and infra-red transmission, which require no specific bearer and radiate their signals as electromagnetic waves are discussed.

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