This European Standard details the test methods to determine the attenuation of converted differential-mode signals into common-mode signals, and vice versa, due to balance characteristics of cables used in analogue and digital communication systems by using the transmission measurement method. The unbalance attenuation is measured in, respectively converted to, standard operational conditions. If not otherwise specified, e.g. by product specifications, the standard operational conditions are a differential-mode which is matched with its nominal characteristic impedance (e.g. 100Ω) and a common-mode which is loaded with 50Ω. The difference between the (image) unbalance attenuation (matched conditions in the differential and common-mode) to the operational (Betriebs) unbalance attenuation (matched conditions in differential-mode and 50Ω reference load in the common-mode) is small provided the common-mode impedance Z com is in the range of 25Ω to 75Ω. For cables having a nominal impedance of 100Ω, the value of the common-mode impedance Z com is about 75Ω for up to 25 pair- count unscreened pair cables, 50Ω for common screened pair cables and more than 25 pair- count unscreened pair cables, and 25Ω for individually screened pair cables. The impedance of the common-mode circuit Z com can be measured more precisely either with a time domain reflectometer (TDR) or a network analyser. The two conductors of the pair are connected together at both ends and the impedance is measured between these conductors and the return path. This European Standard is bound to be read in conjunction with EN50289‑1‑1 , which contains essential provisions for its application.