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.
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.
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.
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.