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:
Aug. 22, 1989
Filed:
Jul. 19, 1988
Wayne R Chism, Greeley, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An automated apparatus and method for in-circuit testing of a subscriber line interface circuit mounted on a telecommunications card. The automated apparatus is capable of testing the functioning of the subscriber line interface circuit: by applying analog voltage to the tip and ring pins and recording the resulting transmit signals, by applying at least one analog voltage signal to the receive pin and recording the resulting signals on the tip and ring pins, by applying onhook and offhock signals to the tip and ring pins and receiving the resulting hook status signal, and by applying a ring command to the ring control pin and recording the resulting ring signal and then applying an offhook signal to the tip and ring pins and receiving the resulting ring trip signal. In conducting these tests, the automated apparatus electrically overdrives any analog or digital signal from associated components on the circuitry.