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Communication cables. Specifications for test methods -- Electrical test methods. Unbalance attenuation (transverse conversion loss TCL transverse conversion transfer loss TCTL)
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. 100Β Ξ©) and a common-mode which is loaded with 50Β Ξ©. 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 50Β Ξ© reference load in the common-mode) is small provided the common-mode impedance Zcom is in the range of 25Β Ξ© to 75Β Ξ©.
For cables having a nominal impedance of 100Β Ξ©, the value of the common-mode impedance Zcom is:
The impedance of the common-mode circuit Zcom 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 ENΒ 50289β1β1, which contains essential provisions for its application.
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