PoE/PoE+ Planning and Implementation Guide 2011-09

13-24
Planning and Implementation for the E5400zl/E8200zl Switches
Configuration Examples
Figure 13-16.Example of a 5412zl with four power supplies, J8713A
This configuration (Figure 13-16) is an example of four power supplies
supplying 900 watts each for a maximum of 3600 watts to a fully loaded chassis
of 288 ports. Therefore out of the total 288 available ports, 233 can be powered
at 15.4 watts each.
Two power supplies could be used to supply PoE power at 1800 watts and the
other two power supplies could be used as secondary power supplies. If the
two sets of power supplies are connected to different power sources, one set
of two could backup the other two in case of failure. With this option the user
must manage the PoE usage in order to maintain redundancy.
Back
Front
900 watts
for PoE
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
Four Internal PoE
Power Supplies
(J8713A)
3600 (without
redundancy)
233 @ average 15.4 W each
288 @ average 7.5 W each
288 @ average 4.0 W each
116 @ average 15.4 W each
240 @ average 7.5 W each
288 @ average 4.0 W each