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My question is that why the pairs of signal cables twist and where is such cable is used? What is the difference in between strait cable and twisted pair cable?
"Twist" is the difference between these cables. please ignore your question. When time comes, you will learn.
Look here for your answer.
When the cables are twisted pairs each conductor in the pair cancel the noise on the other providing for a reliable signal.
http://www.ciscopress.com/articles/article.asp?p=31276
http://fcit.usf.edu/network/chap4/chap4.htm