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:
Sep. 22, 2015
Filed:
Oct. 23, 2012
Wistron Corp., New Taipei, TW;
WISTRON CORP., New Taipei, TW;
Abstract
A test board system and method for a power over Ethernet device are disclosed. The test board includes a direct current (DC) power terminal connected to a DC power supply, and includes a network connector, a detection circuit and a classification circuit. The detection and classification circuits are coupled to the network connector and both receive a DC voltage derived from the DC power supply. During different time stages, the detection circuit provides different impedances between the DC power terminal and the network connector. A voltage variation at a test terminal coupled with the network connector shows whether a powered device is connected to the network connector. During a classification stage, the classification circuit provides an impedance device between the DC power terminal and the network connector to build a current path, and classifies the powered device based on a current flowing through the current path.