Patent ID: 8270311

Claim:
A method of determining a far-end crosstalk/near-end crosstalk (FEXT/NEXT) transfer function for a first line A and a second line B in a bundle of communication lines, said method comprising the steps of: a) transmitting at least during measuring intervals, an input test signal S A at a near end of line A, said test signal having a known power spectrum density (PSD) covering a frequency range of interest; b) measuring a first noise related measurement, PSD QLNNE B Phase1 , at a first or near end of line B; c) measuring a second noise related measurement, PSD QLNFE B Phase1 , at a second or far end of line B; d) stopping transmission of the test signal on line A, and thereafter: e) measuring a third noise related measurement, PSD QLNNE B Phase2 , at a first or near end of line B; f) measuring a fourth noise related measurement, PSD QLNFE B Phase2 , at a second or far end of line B; and g) determining the FEXT/NEXT transfer function on the basis of the first, second, third, and fourth measurements, wherein step g) comprises determining the FEXT transfer function according to:  H AB ⁢  2 = QLNFE B Phase ⁢ ⁢ 1 - QLNFE B Phase ⁢ ⁢ 2 P A ( 1 ) and determining the NEXT transfer function according to:  G AB  2 = QLNNE B Phase ⁢ ⁢ 1 - QLNNE B Phase ⁢ ⁢ 2 P A ⁢ ( 2 ) where P A is the known PSD on line A; wherein each measurement is reported to a central control unit and all steps are coordinated by the central control unit.