Patent ID: 7843800

Claim:
A method for crosstalk test on multi-subscriber communication lines, comprising: loading orthogonal codes to lines among the multi-subscriber communication lines and sending signals loaded with the orthogonal codes at a transmitting side, the orthogonal codes corresponding to the lines; and obtaining a crosstalk vector information according to an actual received signal vector and determining the quantitative value of a crosstalk from a certain line of the lines at a receiving side; wherein the step of determining the quantitative value of crosstalk by the certain line further comprises: performing an operation on the crosstalk vector information of the tone or line and obtaining the quantitative value of the crosstalk from the certain line to the line under test or on the tone of the line under test according to the result of the operation on the crosstalk vector information; wherein the result of the operation on the crosstalk vector information is ∑ i = 1 L ⁢ b i ⁢ Δ ⁡ ( a + jb ) i , where L stands for the length of the orthogonal codes, b i for the orthogonal code corresponding to line i and Δ(a+jb) for the crosstalk vector information.