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Non-interfering method for measuring propagation delay of telecommunications network and apparatus for accomplishing same
Non-interfering method for measuring propagation delay of telecommunications network and apparatus for accomplishing same
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机译:一种测量电信网络传播时延的无干扰方法及其实现装置
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摘要
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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