Configuring Poe; Overview - HP 1920 Series User Manual

Configuring PoE

Only a device with a mark of PoE supports the PoE feature.

Overview

IEEE 802.3af-compliant power over Ethernet (PoE) enables a power sourcing equipment (PSE) to supply
power to powered devices (PDs) through Ethernet interfaces over straight-through twisted pair cables.
Examples of PDs include IP telephones, wireless APs, portable chargers, card readers, Web cameras,
and data collectors. A PD can also use a different power source from the PSE at the same time for power
redundancy.
As shown in
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The PSE supplies power over category 3/5 twisted pair cable for a PoE interface in the following two
modes:
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A PSE can supply power to a PD only when the selected power supply mode is supported by both the PSE
and PD. If the PSE and PD support different power supply modes (for example, the PSE does not support
power over spare wires, while the PD supports power over spare wires), you have to change the order
of the lines in the twisted pair cable to supply power to the PD.
Figure 488 PoE system diagram
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Figure 488, a PoE system comprises the following elements:
PoE power—The entire PoE system is powered by the PoE power.
PSE—The PSE supplies power for PDs. A PSE can examine the Ethernet cables connected to PoE
interfaces, search for PDs, classify them, and supply power to them. When detecting that a PD is
removed, the PSE stops supplying power to the PD. A PSE can be built-in (Endpoint) or external
(Midspan). A built-in PSE is integrated into a switch or router, and an external PSE is independent
of a switch or router. The HP PSEs are built-in. Only one PSE is available on the device, so the entire
device is considered as a PSE.
PI—An Ethernet interface with the PoE capability is called PoE interface. A PoE interface can be an
FE or GE interface.
PD—A PD receives power from the PSE. You can also connect a PD to a redundant power source for
reliability.
Over signal wires—The PSE uses data pairs (pins 1, 2 and 3, 6) to supply DC power to PDs.
Over spare wires—The PSE uses spare pairs (pins 4, 5 and 7, 8) to supply DC power to PDs.
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