Very thanks for your explain.
And also I have a question. I work in telecommunication company and I have a big problem with other departments that I found an abnormal situation in BTS room. 1/2′ cables was rounded (two times) on BTS. I think it is very big signal loss, but they say me that it is standart. I would like to prove it is not right, so I need some documents about this problem. Please help me about this situation. Thanks