Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1982-07-16
1985-05-07
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
1791752R, 324130, G01R 1900, G01R 102, H04M 326
Patent
active
045160708
ABSTRACT:
A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be tested. Computer (200) stores information about each subscriber loop in the geographical area served by a system. Front-end computers (220,221) interact with computer (200) to retrieve pertinent data regarding loops to be tested. Each switching facility in an area includes a loop testing system (e.g., 160) that implements the required functions. The communication functions residing in front-end computers (220,221) and loop testing systems (160,161) are coupled via a data communication network (140) in a manner that allows any front-end computer to communicate with any loop testing system. Users of the system control access and test from consoles having the capability of establishing independent communication paths over the national dial network for interactive tests on loops accessed through standard test trunks. Microprocessor-based circuitry is utilized for numerous system tasks such as signal generation, digital signal processing and controlling sensitive analog measurements. Signal generation includes digital generation of analog waveforms. Signal processing techniques incorporate various digital filters to analyze sample sequences derived from, for example, dial pulses and coin telephone signals. Sensitive analog measurements of loop characteristics are effected with a magnetic current detector that operates over broad current and frequency ranges. Frequency dependent measurements are converted to DC using synchronous demodulation techniques to enhance resolution.
REFERENCES:
patent: 4274051 (1981-06-01), Condon
patent: 4278938 (1981-07-01), Morriss
patent: 4303880 (1981-12-01), Munt et al.
Martin, R. L.; "Automation of . . . "; International Symposium on Subscriber Loops and Services; Conference Pub. No. 137; May 1976.
Dale, O. B.; "The Evolution of the Automated . . . "; Conference Record of the International Symposium on Subscriber Loops and Services; Mar. 1978; pp. 64-68.
Brown James M.
Kemper Kyran B.
AT&T Bell Laboratories
Karlsen Ernest F.
Nimtz Robert O.
Peoples John T.
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