UTP cabling type, called skrętkami nieekranowanymi, are currently the most-used means of transmission of data in corporate networks. These cables are made up of unshielded twisted with each other, so nieobleczonych aluminum, copper pairs. The weave to exclude interferences, which is a source of the external environment.

The most common classification UTP cables on the basis of their performance is the proposed jointly by U.S. organizations EIA (Electronic Industries Alliance) and TIA (Telecommunications Industry Association) engaged in the development of standards for a broad-electronic equipment. Under the standard, it identified eight categories of performance UTP cables - from 1 to 7 (with an additional category 5 + or 5e) unshielded twisted pair, but now have only the importance of the last four of them - 5, 5 + (5e), 6 and 7 The most widely accepted standard is 5 +, allowing for the transfer of data within the network at a rate of up to 100 Mb / s. Selection of the appropriate categories used cables is of great importance for the functioning of the entire network. As in the case of servers, structured cabling building should be looking to think and choose those technologies that we will be able to use in the foreseeable future.