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AT-RPS3000 Redundant Power Supply Installation Guide
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PoE+ power is different in that the power supplies in the switch and
chassis do use load-sharing to provide power to the powered devices. This
assumes, of course, that both supplies have PoE+ power. So, in essence,
the AT-RPS3000 Chassis performs two roles for PoE+ switches. It acts as
a redundant source of system power for the switches and, assuming the
chassis has PoE+ power supplies, actively provides them with additional
power for PoE+ so that they can support more powered devices.
Of the three available power supply modules for the chassis, two modules
provide PoE+ power along with system power to the PoE+ switches. They
are the AT-PWR800 and AT-PWR1200 Modules. These modules can
provide PoE+ power to just one switch at a time, meaning that each PoE+
switch has to have a separate power module in the AT-RPS3000 Chassis,
that is, if you want the switches to receive additional PoE+ power from the
chassis.
All four RPS ports on the chassis may be used to provide system power to
the switches. But only RPS 2 and 4 ports, labeled PoE+/System, may be
used to supply PoE+ power. Thus, for a PoE+ switch to receive PoE+
power from a power supply in the chassis, it has to be connected to one of
those ports. PoE+ switches that are connected to RPS 1 or 3 port will not
receive extra PoE+ power, only redundant system power.