Attenuation To Crosstalk Ratio
Attenuation To Crosstalk Ratio ( ACR ; German attenuation-crosstalk attenuation ratio , also crosstalk attenuation ) is the ratio of insertion loss (insertion loss) to crosstalk (NEXT) of a transmission path in a structured cabling .
For a transmission link with a UTP cable, the insertion loss is 19 dB and the NEXT value is 82 dB. This means that the ACR value is 82 dB - 19 dB = 63 dB. Another transmission link has an ACR value of 50 dB, this transmission link has a poorer quality compared to the first-mentioned one, because the ACR value is lower.
Limit values according to standard
Smallest permissible ACR limit values in dB for class-specific frequencies.
|Class according to DIN EN 50173||100 MHz||250 MHz||600 MHz|
|Class D.||11.9||not defined||not defined|
|Class E.||23.3||4.7||not defined|
For (digital) communications technology, it must be ensured that the ACR does not fall below 0 within the bandwidth to be transmitted . The ACR is comparable to the signal-to-noise ratio from telephony or any other transmission technology.
- Michael Dickreiter, Volker Dittel, Wolfgang Hoeg, Martin Wöhr (eds.): Manual of the recording studio technology . 8th, revised and expanded edition, 2 volumes. Walter de Gruyter, Berlin / Boston 2014, ISBN 978-3-11-028978-7 .
- DIN EN 50173-1, Information technology - Application-neutral communication cable systems - Part 1: General requirements
- IT manual, 7th edition, Westermann Schulbuchverlag, Braunschweig 2011, ISBN 978-3-14-2250427 , p. 291.