Near-end communications line characteristic measuring system

H - Electricity – 04 – B

Patent

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Details

H04B 3/46 (2006.01) G01R 27/04 (2006.01) H04M 3/30 (2006.01) H04N 1/00 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2129002

A method and apparatus (3, 60, 202, 300) are presented for mea- suring the dynamic, or alternating current, and static, or direct current, characteristics of a cable pair (2, 10, 24, 133) from one end, the local end, by utilizing an element (1, 19, 20) possessing known non-linear electrical characteristics connected across the other end, the remote end, together with methods and ap- paratus (30; 111) for connecting the non-linear element (1) across the re- mote end of the cable pair (2, 10, 24, 133) and disconnecting the non-lin- ear element (1) by means of electri- cal voltages impressed across the cable pair (2, 10, 24, 133) at the lo- cal end. In the method and system of the present invention, the near end test set (3, 60, 202, 300) is electrically transposed to the far end of the cable pair (2, 10, 24, 133) making it appear, for all in- tents and purposes, to be at the far end during the test while, in reality, physically remaining at the near end. The non-linear ele- ment (1), in its non-linear region, when suitably excited by two or more alternating signals of different frequencies (4, 12, 13, 41, 42, 113, 114), produces additional frequencies which travel back from the far end to the near end of the cable pair (2, 10, 24, 133) and are modified by the characteristics of the cable pair (2, 10, 24, 133). By selecting specific excitation frequencies and measur- ing the characteristics of the additional frequencies returned (6, 22, 52, 200), the characteristics of the cable pair (2, 10, 24, 133) can be deduced.

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