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:
Apr. 02, 1991
Filed:
Nov. 30, 1989
Gerald J Parsons, Chester Springs, PA (US);
Brian D Greenwald, Chester Springs, PA (US);
John J McGrath, Kennett Square, PA (US);
Stephen W Andrasko, Drexel Hill, PA (US);
Communications Test Design, Inc., West Chester, PA (US);
Abstract
A telephone line card tester operates by transmitting test data to the digital port of a telephone line interface card, and by subsequently receiving the data which is transmitted from this card through the same digital port. Once received, the data pattern is compared with an expected data pattern. A difference between the received data and the expected data is indicative of a defect in the telephone line interface card. To meet telephone line interface card timing consideration, the transmission of data to the interface card and the analysis of data received from the card are performed by separate subsystems. To accomplish this task, the telephone line interface card is tested in a test fixture which includes a digital line interface card tester, and a communications test set. The communications test set is used for such functions as ring generation and line simulation. The digital line interface card tester is used to exercise the line interface card in a variety of signalling scenarios which simulate the operational environment of the line card. A user interface is also provided.