write the advantages and disadvantages of the following
1) twisted pair (phone line)
2.coaxial(round insulated wire)
3. fibre optics(glass wire)
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1)twisted pair The pair of twisted is that the simplest transmission medium. it consists of 1 or more pairs of electrical son arranged spiral. The twisted pairs could also be shielded, metal sheath surrounding completely metallic pairs or unshielded. They can also be “unscreened”.
Metal cables are particularly suitable for the transmission of data on short distances. If the length of the wire is little, a couple of hundred meters to many kilometers, speeds of several megabits per second are often achieved without an unacceptable error rate.
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