ELFEXT
Equal Level Far-end Crosstalk (ELFEXT), also known as ACR-F, refers to the same undesired coupling as in FEXT, but the ratio is measured against a desired receive signal. ELFEXT is, therefore, a more relevant value than FEXT. But, a FEXT and attenuation measurement will directly give the ELFEXT value.
Recently the designation was changed from ELFEXT to ACR-F (far end ACR).