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.
2.5.1
Power and voltage range according to the standard
Note the values specified for the power of the power source, so that the power supply is ensured
at the power consumers according to the standard.
PoE class
Power supplied by the pow‐
er source
Available power at the pow‐
er source
Type
Standard
Designation
0
15.4 W
12.95 W
1
IEEE802.3af
PoE
1
4
3.84 W
2
7
6.49 W
3
15.4 W
12.95 W
4
30
25.5 W
2
IEEE802.3at
PoE+
5
45
40 W
3
IEEE802.3bt
4-pair PoE
6
60
51 W
2.5.2
PoE properties of the devices
Note
Turn off the power source before you disconnect the PoE cable of a power consumer.
Power source
• The device can supply energy consumers of the standards IEEE802.af Type 1, IEEE802.at
Type 2 or IEEE802.3bt Type 3.
• A power source can make provide a total of 210 W available (including line losses). The power
can be distributed to the ports as desired.
PoE ports
• The PoE ports are not isolated from each other. This means that they meet the conditions
named in Environment A (IEEE 802.3): Power supply over Ethernet within a power supply
system.
• The electrical isolation of the ports is designed for 1500 Vrms (1 minute).
• Ports P1 to P8 support PoE classes 0 to 6. They supply connected devices with up to 60 W per
port (according to IEEE802.3af, IEEE802.3at and IEEE802.3bt).
Description of the device
2.5 Power over Ethernet
SCALANCE XR-100WG
18
Operating Instructions, 09/2020, C79000-G8976-C455-04
