Black Box LPB2910A User Manual page 153

for a ll p orts e xceeds t he a mount o f p ower t hat t he p ower s upply c an d eliver o r i f t he a ctual p ower
consumption for a given port exceeds the reserved power for that port. The ports are shut down
according to the ports priority. If two ports have the same priority, the port with the highest port
number i s s hut d own.
2. Reserved Power: In this mode the ports are shut down when total reserved powered exceeds
the a mount o f p ower t hat t he p ower s upply c an d eliver. I n t his m ode, t he p ort p ower i s n ot t urned
on i f t he P D r equests m ore p ower t han i s a vailable f rom t he p ower s upply.
Primary a nd B ackup P ower S ource:

Some switches support having two PoE power supplies. One is used as primary power source, and
one as backup power source. If the switch doesn't support a backup power supply, only the
primary power supply settings will be shown. If the primary power source fails, the backup power
source will take over. To determine the amount of power the PD may use, you must define the
amount o f p ower t hat t he p rimary a nd b ackup p ower s ources c an d eliver.
Valid v alues a re i n t he r ange 0 t o 2 000 W atts.
Port:

This i s t he l ogical p ort n umber f or t his r ow.
Ports t hat a re n ot P oE-­‐capable a re g rayed o ut a nd i mpossible t o c onfigure P oE f or.
PoE M ode:

The P oE M ode r epresents t he P oE o perating m ode f or t he p ort.
Disabled: P oE d isabled f or t he p ort.
PoE: E nables P oE I EEE 8 02.3af ( Class 4 P Ds l imited t o 1 5.4 W ).
PoE+: E nables P oE+ I EEE 8 02.3at ( Class 4 P Ds l imited t o 3 0 W ).
Priority:

The P riority r epresents t he p orts p riority. T here a re t hree l evels o f p ower p riority n amed L ow, H igh,
and C ritical.
The priority is used in the case where the remote devices requires more power than the power
supply c an d eliver. I n t his c ase, t he p orts w ith t he l owest p riority w ill t urn o ff s tarting w ith t he p ort
with t he h ighest p ort n umber.
 Maximum P ower:
The M aximum P ower v alue c ontains a n umerical v alue t hat i ndicates t he m aximum p ower i n w atts
that c an b e d elivered t o a r emote d evice.
The m aximum a llowed v alue i s 3 0 W .
141
Publication date: Sept, 2015
Revision A1