Remote testing system for electrical circuits

Details Remote testing system for electrical circuits Remote testing system for electrical circuits

1985-09-27

1987-01-27

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 18, H04B 346

Patent

active

046395571

ABSTRACT:
An apparatus for remotely testing electrical circuits, such as telephone circuits, includes a stand-alone unit which is located in the end office, for example, for remote access by use of an ordinary push-button telephone set sending dual tone multiple frequency signals. The apparatus has a twin-bus structure wherein one of the busses is an analog bus through which the telephone link is made and over which analog test signals are communicated; the other bus is a digital bus for communicating digital control and data signals with a microcomputer included within the apparatus. Operating between the two busses are suitable interface circuits for receiving the control signals from the telephone set and for communicating the analog test signals to a selected electrical circuit to be tested. The analog test signals are generated by an analog test signal circuit also connected between the analog and digital busses. The microcomputer, connected only to the digital bus, controls the operation of the apparatus in response to dual tone multiple frequency control signals received from the telephone set. Responses from the test are transmitted to the remote site as synthesized speech signals for verbally communicating the results through the telephone set.

REFERENCES:
patent: 3822367 (1974-07-01), Humphrey
patent: 4076970 (1978-02-01), Lubarsky, Jr. et al.
"The Bell System Technical Journal, Jul.-Aug. 1982" pp. 1209-1274: Mechanized Loop Testing Strategies and Techniques, F. J. Uhrbane; and Mechanized Loop Testing Design, O. B. Dale, T. W. Robinson and E. J. Theriot; and Second-Generation Mechanized Loop Testing System--A Distributed Microprocessor Application, H. Rubin.
16.9.7 Switched Maintenance Access Systems for Special Service Circuits.
16.9.8 Switched Access Remote Test System (SARTS).
37100 Centralised Remote Access and Test System for Voice and Data Circuits, Hewlett Packard.
Solutions for Telecommunications and Datacommunications, Hewlett Packard-37050S FDM Network Monitoring System (6/83); Hewlett-Packard Telecommunications Test Equipment.
Digital/Analog Remote Test System Model 100R-7, DARTS, Design Development, Inc.
Model 9900 Series CMTS System, Wiltron.

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