Dwelley David,Heath Jeffrey,Stewart Heath,Paul Michael
申请号：
US201514705849
公开号：
US9667429(B2)
申请日:
2015.05.06
申请国别(地区):
美国
年份:
2017
代理人:
Patent Law Group LLP `Ogonowsky Brian D.
摘要：
A PSE includes a PSE controller that performs a handshaking routine with any PDs connected to the data wire pairs and spare wire pairs and applies power to the data wire pairs and spare wire pairs, via a switch, if certain conditions are met. Two different levels of currents are supplied to different terminals of the PSE controller that are connected to the data wire pairs and the spare wire pairs, and the resulting voltages are measured. The voltages are used to determine the PD impedances at the ends of the data wire pairs and spare wire pairs to determine whether a PD is connected to the data wire pair, whether another PD is connected to the spare wire pair, or whether a single PD is connected to both the data wire pairs and the spare wire pairs.
