PoE/PoE+ Planning and Implementation Guide 2011-09

13-23
Planning and Implementation for the E5400zl/E8200zl Switches
Configuration Examples
Figure 13-15.Example of a 5412zl with three power supplies, J8713A
This configuration (Figure 13-15) 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.
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.
Back
Front
900 watts
for PoE
900 watts
for PoE
900 watts
for PoE
Source of Power Watts Available # of Ports Powered and Average
watts/Port
Redundant # of Ports Powered and
Average watts/Port
Three Internal
PoE Power
Supplies
(J8713A)
2700 (without
redundancy)
175 @ average 15.4 W each
288 @ average 7.5 W each
288 @ average 4.0 W each
58 @ average 15.4 W each
120 @ average 7.5 W each
225 @ average 4.0 W each