Performance evaluation of telecommunication lines can be a decisive action in the practice of telecommunication service providers. There are several evaluation techniques in use of telecommunication companies. These techniques can be divided into some groups depending on the efficiency, the cost or the set of the input parameters. This paper lists some of the used evaluation techniques, aims to shortly introduce a new method for preliminary evaluation of the twisted pairs of the access networks for commonly used digital data transmission technologies, and describe the circumstances of the line noise as an optional input parameter of decision making. It will be cleared, that the line noise plays role on forming data transfer rate, however in certain cases it can be passed over.
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