HP ProCurve 2520 Planning And Implementation Manual page 143

Figure 10-15.Example of a 5412zl with three power supplies, J8713A
This configuration (Figure 10-15) is an example of three power supplies
supplying 900 watts each for a maximum of 2700 watts to a fully loaded chassis
of 288 ports. Therefore out of the total 288 available ports, 175 can be powered
at 15.4 watts each. That's equal to a little over 6 and a half modules. Or all ports
could be used at 7.5 watts.
Source of Power Watts Available
Three Internal 2700 (without
PoE Power redundancy)
Supplies
(J8713A)
Two power supplies could be used to supply PoE power at 1800 watts and the
other one power supply could be held in reserve as redundant power supply
if one of the primary power supplies fail. However this configuration cannot
be fully redundant.
Front
# of Ports Powered and Average
watts/Port
175 @ average 15.4 W each
288 @ average 7.5 W each
288 @ average 4.0 W each
Planning and Implementation for the 5400zl/8200zl Switches
900 watts
for PoE
900 watts
for PoE
Redundant # of Ports Powered and
Average watts/Port
58 @ average 15.4 W each
120 @ average 7.5 W each
225 @ average 4.0 W each
Configuration Examples
900 watts
for PoE
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