Non-interfering method for measuring propagation delay of teleco

Details Non-interfering method for measuring propagation delay of teleco Non-interfering method for measuring propagation delay of teleco

1988-06-14

1989-07-04

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 24, H04M 124, H04B 346

Patent

active

048457353

ABSTRACT:
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.

REFERENCES:
patent: 3899738 (1975-08-01), Harzer

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