PoE (4PPoE)


Xmultiple's Engineering Department

4PPoE - 4-Pair

What markets are driving the need for >25.5W PoE and a new IEEE 802.3 standard? Are there technical challenges for these markets not covered in the existing standard?

4-pair PoE (4PPoE) requirements of PoE lighting has become part of the future standard for 4PPoE.

The two main advantages of 4PPoE discussed in the Call for Interest (CFI) held in March 2013 are the ability to deliver more power than the current standard and increased efficiency. These two advantages both play a big role in opening up many new markets to PoE. Building automation and LED lighting is a great example for illustrating how these new markets will help to shape the new 4PPoE standard.

One requirement for LED lighting to address is efficiency, but not in the way you might expect. In fact, it is standby power regulations for lighting that are prompting some discussion. Current regulations state that an LED lighting device cannot consume more than 1W in standby mode, but the level is lowering to 0.5W in 2016. What makes this requirement more difficult to meet than you might think is that it is measured from the AC mains supply. Meaning, the inefficiencies of all the power supplies between the AC mains and the lighting device are included.

The requirement for lower standby power led to a discussion about lowering the maintain power signature (MPS) specifications in the new 4PPoE standard. The current standard allows for a minimum power of approximately 500mW (10mA at 50V) if a DC current is used to maintain the connection or approximately 100mW if a pulsed current is used.


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