The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1993
Filed:
Oct. 02, 1991
Charles D Stephens, Dallas, TX (US);
Communications Technology Corporation, Dallas, TX (US);
Abstract
Disclosed is a telephone line testing device comprising: clip leads for connecting the device to 'ring,' 'tip' and external ground lines of the telephone line to be tested. Terminal pads make 'ring' and 'tip' connections to a craft telephone and a first testing circuit connectable to receive DC signals from the 'ring' and the 'tip' lines to provide electrical signals indicative of the magnitude of direct current available from the lines. Another testing circuit is connectable to receive AC signals from the 'ring' and the 'tip' lines to provide electrical signals indicative of the signal loss of the lines. A third testing circuit is connectable to receive AC signals selectably either from the 'tip' and the 'ring' connections or from the 'tip' and the external ground connections comprising a filter and amplifier to receive and treat the AC signals and to apply the treated signals to the input of the second testing circuit. A line holding and power supply circuit is connectable to draw a line holding current from the 'ring' and said 'tip' lines through the clip leads and to produce regulated direct current to power the second and third testing circuits.