HP ProCurve 2520 Planning And Implementation Manual page 140

Planning and Implementation for the 5400zl/8200zl Switches
Configuration Examples
5 ports must be used
on this module
Figure 10-12.Example of a 5412zl with three power supplies, J8712A
In this example (Figure 10-12) there are three power supplies supplying 273
watts each for a maximum of 819 watts.
To achieve the 53 ports at 15.4 watts the PoE devices must be divided up and
connected to three different modules. Remember, as soon as a module is
installed into the switch, 22 watts is reserved for its use.
Source of Power Watts Available # of Ports Powered and Average watts/
Three Internal 819 (without
Power Supplies redundancy)
(J8712A)
In this configuration one power supply (273 watts) could be used for
redundant power. However, remember it can only support a limited number
of ports depending on the wattages that are being supplied to the ports.
10-20
53 ports can receive up
to 15.4 watts of PoE
Front
Port
53 @ average 15.4 W each
109 @ average 7.5 W each
204 @ average 4.0 W each
273 watts
for PoE
273 watts
273 watts
for PoE
for PoE
Back
Redundant # of Ports Powered and
Average watts/Port
17 @ average 15.4 W
36 @ average 7.5 W each
68 @ average 4.0 W each