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HP ProCurve 2520 Planning And Implementation Manual: Provisioning Power For Poe

Procurve power over ethernet (poe/poe+).
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Operating Rules

Provisioning Power for PoE

Provisioning Power for PoE
All of these PoE switches support an external power supply that can provide
either redundant or extra PoE power. It is important to understand how PoE
power is provisioned in order to use these external power supplies efficiently.
The following chapters will discuss this in detail.
By connecting an external power supply you can optionally provision more
PoE wattage per port and or supply the switch with redundant 12V power to
operate should an internal power supply fail.
By installing a second power supply in the 5406zl/8206zl or a third power
supply in a 5412zl/8212zl chassis, depending on how many PoE ports are being
supplied with power, the switch can have redundant power if one power
supply fails. A Power Supply Shelf (external power supply) can also be
connected to the 5400zl/8200zl switches to provide extra or redundant PoE
power.
For example, if the 5406zl has two 24-port PoE modules (J8702A) installed,
and all ports are using 15.4 watts, then the total wattage used is 739.2 watts
(48 x 15.4). To supply the necessary PoE wattage a J8713A power supply is
installed in one of the power supply slots.
To gain redundant power, a second J8713A must be installed in the second
power supply slot. If the first power supply fails, then the second power supply
can supply all necessary power.
2-9

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