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equal level far end crosstalk (ELFEXT)

Equal Level Far End Crosstalk (ELFEXT) is a length-independent quantity for the transmission quality, which defines the ratio of the crosstalk output level to the actual output level.

The noise level interspersed on the second conductor pair is set in relation to the output level.

Equivalent circuit diagram for ELFEXT

Equivalent circuit diagram for ELFEXT

The ELFEXT value has the advantage over the FEXT value that it does not depend on the cable length, since both the "far" interference signal and the output signal depend on the cable length and are determined at the same distance location. The ELFEXT could also be called the Far End ACR, which is roughly equivalent to the Attenuation to Crosstalk Ratio (ACR) for Near End Crosstalk (NEXT).

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Englisch: equal level far end crosstalk - ELFEXT
Updated at: 05.11.2011
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Translations: DE