Non-interfering method for measuring propagation delay over...

Details Non-interfering method for measuring propagation delay over... Non-interfering method for measuring propagation delay over...

H - Electricity

04

B

324/64

H04B 3/46 (2006.01) H04J 3/06 (2006.01)

Patent

CA 1321413

ABSTRACT OF THE DISCLOSURE Methods and apparatus for measuring propagation delay over a line without interfering with data communications over the line are disclosed. A known signal is sent and looped back over a secondary channel, and the loop time is measured. Because the known signal is sent at a non-interfering frequency at the edge of the passband, the loop time minus fixed delay times of the communicating means does not provide a true measure of propagation delay. Rather, the envelope delay distortion must be determined and also subtracted from the loop time. The envelope delay distortion is determined as a function of the utilized non-interfering frequency and the line length, the latter of which may be estimated from the loop time.

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