Attenuation-to-crosstalk ratio
Attenuation-to-crosstalk ratio (ACR) is a parameter that is measured when testing a communication link, which represents the overall performance of the cable. AcR is a mathematical formula that calculates the ratio of attenuation to near-end crosstalk for each combination of cable pairs.
Source: Wikipedia — Attenuation-to-crosstalk ratio (CC BY-SA 4.0)