Method and apparatus for measuring transmission characteristics

Details Method and apparatus for measuring transmission characteristics Method and apparatus for measuring transmission characteristics

1979-11-23

1981-11-24

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 22, 371 27, H03K 1332, H04B 1700, H04Q 120

Patent

active

043028438

ABSTRACT:
A method for measuring the transmission characteristics of a transmission line during gaps in communications on said transmission line consists of monitoring the transmission line for a gap in communication thereon, and applying an identifier signal followed by a test pulse to the input of the transmission line when such a communications gap is recognized. An output of the transmission line is monitored and when the identifier signal is recognized, the test pulse which follows the identifier is evaluated. The test pulse is made up of a plurality of component frequencies at equally spaced intervals, and evaluation of the test pulse at the output yields the attenuation of phase characteristics of the transmission line for each component frequency, without interfering with communications on the line.

REFERENCES:
patent: 3895298 (1975-07-01), Schollmeier
patent: 4093940 (1978-06-01), Maniere
CCI Recommendation No. 0.81, vol. IV, 2, pp. 44-50.
Bell Laboratories Record, vol. 43, No. 9, Oct. 1965, pp. 369-372.
Electronic Engineering, Aug. 1966, pp.5 15-519.

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