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Description of the device

3.5 Power over Ethernet (PoE)

3.5

Power over Ethernet (PoE)

Function

The "Power over Ethernet" function supplies connected devices with power via the Ethernet

cable. Devices supplied with power via an Ethernet cable do not require a separate voltage

source.

PoE-compliant devices can be divided into the following groups:

● Power source (PSE - Power Sourcing Equipment)

These inject power onto the Ethernet cable.

● Power consumer (PD - Powered Device)

These are supplied with power via the Ethernet cable.

Port extender PE408PoE

Without connected PoE power supply

If no PoE power supply is connected, the PE408PoE functions like a PE408. It expands the

basic device by 8 RJ-45 ports.

With connected PoE power supply

If a PoE power supply is connected, the PE408PoE port extender is a power source. The

PE408PoE can supply devices capable of PoE with power via the Ethernet cable.

You will find notes on connecting the PoE power supply in the section "PoE power supply of

the PE408PoE (Page 34)".

Note

Even when a PoE power supply is connected, you can connect devices without PoE

functionality. A voltage is applied only after the port extender has detected an end device

capable of PoE at the port. With devices not capable of PoE, only the data connection is

used.

Extender for SCALANCE XM-400

Operating Instructions, 05/2014, C79000-G8976-C332-03