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4-12

Planning and Implementation for the Series 5400zl Switch

Planning Your PoE Configuration

Planning and

Implementation for the

Series 5400zl Switch

If PoE power is disabled to all ports on a module the 22 watts that was reserved

for that module is returned to the pool of available watts and can be used by

another module’s ports.

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.

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.

Also in this configuration, there is no redundant power. Should a power supply

fail, the remaining power supply can keep the switch running, but cannot

supply all the PoE power needed by the modules.

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

•None

HP ProCurve zl Series User Manual

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