Accession Number:

ADA009115

Title:

Circuit Quality Monitor.

Descriptive Note:

Final rept. 26 May 71-26 Mar 74,

Corporate Author:

ELECTRONIC COMMUNICATIONS INC ST PETERSBURG FLA

Personal Author(s):

Report Date:

1975-02-01

Pagination or Media Count:

60.0

Abstract:

This is the final report on the Circuit Quality Monitor program. Two advanced development models of the Circuit Quality Monitor have been built and tested. The monitor is a device which automatically measures and continuously displays the quality of voice bandwidth channels in the U.S. Army tactical toll system. Twelve channels and one self test channel are measured on a non-interfering basis once every fifteen minutes. Three degrees of quality are continuously displayed usable for data, usable for voice but not high speed data, and unusable. Quality is measured in terms of amplitude spectrum, group delay spectrum, frequency offset, and message circuit noise. Channel traffic is monitored continuously on all channels and a low level non-interfering probe signal inserted when idle or when high level data traffic exist. Long integration time constants are implemented via phase locked loops to perform measurements at high negative signal to noise ratios. The channel performance parameters, measurement technique, implementation, and test results are described.

Subject Categories:

  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE