The technology of data transmission via copper cables is far from being exhausted. However, the new technologies require a higher quality of cabling. In order to ensure that the existing cabling supports the higher data rates, appropriate tests must be carried out and documented before commissioning. In addition, existing networks must be qualified for the ability to upgrade. Tests up to 10 Gbit/s are already possible in the environment of the latest generation of qualifiers, regardless of the cable category or junction boxes.