Lesson 7 - Network Transmission Media
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When we talk about transmission media or medium its meant that we talk about connecting cable which are used to connect two or more work-station. Many different types of networking media are used in a LAN (Local Area Network) like copper conductor in the form of twisted pair. Recently we use optical cable as a networking medium.
There are some other medium also which help in transmission of data such as microwave transmission, infrared, telephone line etc.
So because of this wide variety of networking medium we classified them in two categories, named as -
Guided media includes the wire and cables for transmission of data while unguided media is free from cable its uses the waves, air, vacuum for their transmission.
Guided media is also known as Wired Media or Bound Media because the data signals are transmitting along a specific path which are bounded or guided by cable system.
It a most common form of transmission medium where two or more work station are connected with each other with the help of twisted pair. In twisted pair cable, wire is twisted together in pairs.
In co-axial cable there is several layer coiled over the conductor. Solid wire core is surrounded by one or more wire shield, each one is separated by plastic insulator. Signal are carried by inner core and shield provide its ground. Because of high electric properties its gives a high speed transfer of data signal and leads a high speed communication between nodes or host.
That a reason they are widely used in television, network and communication sector.
Optical fiber consists of thin glass fibers that can carry information at frequencies in the visible light spectrum. It consists of a very narrow strand of glass called a core. Which is surrounded by concentric layer of glass called cladding. Cladding is also having a protective coating called Jacket or Sheath which is of plastic coated.
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