Patent ID: 7855474
Filing Date: 2010-12-21
Classification: H04L

Abstract:
1. A method in a power sourcing equipment of detecting a powered device, comprising: measuring a voltage across a port of a power sourcing equipment upon application of a current source to said port during a predetection time period; determining whether said measured voltage exceeds a threshold voltage level within said predetection time period; if it is determined that said measured voltage exceeds said threshold voltage level within said predetection time period, then classifying a device coupled to said port as an invalid powered device; if it is determined that said measured voltage does not exceed said threshold voltage level within said predetection time period, then classifying said device coupled to said port as a potentially valid powered device; and after determining that said device coupled to said port is a potentially valid powered device, then detecting a presence of a signature resistance at said device, wherein said detection enables a determination of whether said device is a valid powered device.