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attenuation to crosstalk ratio (wiring) (ACR)

The ratio of cable attenuation to crosstalk attenuation as a function of frequency is decisive for the quality of a transmission channel. This ratio is the Attenuation to Crosstalk Ratio( ACR).

The ACR value is therefore a measure for the qualitative evaluation of a transmission link and not for cables. It is therefore also specified exclusively in conjunction with the link classes. The Attenuation to Crosstalk Ratio is the ratio between the strength of the incoming signal and the noise on a line.

Equivalent circuit diagram for ACR

Equivalent circuit diagram for ACR

The signal level fed into a cable pair is reduced by the cable attenuation at the cable end. Further signal degradation occurs due to the induced signal, which further degrades the signal level as a result of near-end crosstalk. The ACR value indicates the relationship between the attenuation and the near-end crosstalk at a given frequency. In order to be able to transmit complex digital coding processes without errors, the greatest possible distance between the useful signal and an interfering signal is required.

The ACR value is specified in the cabling standards for the quality assessment of end-to-end connections for the different categories.

Informations:
Englisch: attenuation to crosstalk ratio (wiring) - ACR
Updated at: 26.03.2008
#Words: 187
Links: cable, attenuation (ATT), crosstalk (XT), frequency (f), transmission
Translations: DE
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