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:
Feb. 09, 1993
Filed:
Jul. 10, 1991
Stephen Ernst, Colorado Springs, CO (US);
Hewlett Packard Company, Palo Alto, CA (US);
Abstract
An apparatus and method for monitoring voltage on a LAN cable on which data is conveyed by negative-going pulses. Positive voltage on the LAN cable is interpreted as noise. Positive voltage is detected by, for example, comparing the voltage on the LAN cable to a positive reference voltage, determining the peak positive voltage on the LAN cable, or determining the average positive voltage on the LAN cable. Upon the detection of positive voltage on the LAN cable, the presence (and possibly the amount) of noise is indicated to a person or data processing system which supervises the LAN called a LAN sentinel. The apparatus or method could be implemented in a Media Attachment Unit (MAU) with audio, visual or electronic noise indication means. Alternatively, it could be implemented as a hand-held diagnostic tool.