4-6
Planning and Implementation for the Series 5400zl Switch
Planning Your PoE Configuration
Planning and
Implementation for the
Series 5400zl Switch
In this example, there are three modules in the chassis and therefore 22 watts
is reserved for each module. In order to use the 22 watts, PDs must be
connected to each module, or all ports on one module could have the PoE
power disabled.
Figure 4-2. Example of a 5406zl with two power supplies, J8712A
In this example there are two power supplies supplying 273 watts each for a
maximum of 546 watts.
In this example the load must be balanced or split between two or three
modules in order to effectively use all 546 watts. The number of devices and
wattage must be split between the modules. This would also help limit the
effects of a single module failure. If one module fails, only the devices on that
module would lose power.
Or, one power supply could be used to supply PoE power at 273 watts and the
other power supply could be held in reserve as a secondary power supply if
the primary power supply fails. If both power supplies are connected to
different power sources, one could backup the other in case of failure. With
this option the user must manage the PoE usage in order to maintain
redundancy.
Connecting a fully loaded external power supply can double the available PoE
power. See page 4-10
35 ports can receive up to
15.4 watts of PoE power
The PoE power for all ports on
this module has been disabled
Power Supply
J8712A
273 Watts
for PoE
273 Watts
for PoE
Source of Power Watts Available # of Ports Powered and Average Watts/
Port
Redundant # of Ports Powered and
Average Watts/Port
Two Internal
Power Supplies
(J8712A)
546 (without
redundancy)
• 35 @ average 15.4 W each
• 78 @ average 7.0 W each
• 136 @ average 4.0 W each
• 17 @ average 15.4W
• 39 @ average 7.0 W each
• 68 @ average 4.0 W each
Two External
Power Supplies
(J8712A)
Additional 546 • 70 @ average 15.4 W each
• 144 @ average 7.0 W each
• 144 @ average 4.0 W each
• 35 @ average 15.4W
• 78 @ average 7.0 W each
• 136 @ average 4.0 W each
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