The Evolution of Power over Ethernet Standards
There is a clear trend and market need for high-power transmission over cable. Power over HDBaseT (POH) enables the transfer of DC power in conjunction with data signals over a single Ethernet cable to a distance of up to 100 meters (m). The POH standard is based on the IEEE 802.3at standard with the appropriate modifications to enable safe delivery of up to 100 watts (W) over the four-pairs of the Ethernet cable.
In this document we will review the evolution of Power over Ethernet (PoE) from the days of IEEE 802.3af (delivery of 15.4W) to IEEE802.3at (delivery of 30W), up to the HDBaseT power standard, POH, that specifies safe delivery of up to 100W.