Juha Nurminen, VP of Engineering @ Zigen
One point of contention with HDBaseT is the implementation of its power-over-ethernet (PoE) capabilities by certain manufacturers. We have heard it called PoH, PoCC and POE. Not all HDBaseT products are following the HDBaseT Alliance recommendation for implementing power over an HDBaseT link – and frankly the Alliance is recommending a practice that is not considered safe by IEEE 802.3 committee members (use of 4 wires vs. 2 wires referenced in the POE standard. A lot of people are putting in random power; for example, some people are putting in 12 volts, some 28 volts, some 48 volts. The way we typically define the PoE standard is that the two ends do a low-voltage handshake, which means that you don’t have any high voltage just sitting there in your cable. That offers another degree of protection.
It’s really dangerous to have that power running on category cable if you don’t put in the proper safety considerations required by IEEE 802.3.
The ZIG-POE-70 sender provides a complete solution for detection and powering of POE IEEE 802.3af devices such as the ZIG-POE receiver/TV box. The sender will safely detect, classify, and provide up to 13 watts of power to the receiver via HDBaseT connection. The sender reads a signature from the receiver and only enables power delivery if all constraints for safe power delivery are met. During power delivery the link is continuously monitored for any fault or overloading conditions and the current is limited to avoid hazardous conditions.
The ZIG-POE-70 sender senses the removal of a powered device and turns the 48V power supply off immediately when the receiver is disconnected.
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