Description of the device
4.3 Interfaces and signaling contact of the switches
SCALANCE X-300
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Operating Instructions, 05/2016, A5E01113043-20
PoE-compliant devices can be divided into the following groups:
●
PSE - power sourcing equipment
These inject power onto the Ethernet cable.
●
PD - powered devices
These are supplied with power via Ethernet.
4.3.1.4
Ports of the X308-2M PoE
The PoE ports of the switch
As a PSE, the X308-2M PoE supplies PoE-compliant devices with power over Ethernet. The
48 V power required to supply the powered devices is generated internally on the switch, no
extra power supply unit is necessary.
The X308-2M PoE uses the "alternative A" for this. Per RJ-45 port, a maximum of 15.4 W
are available for supplying a PoE-compliant device. If a Cat5/Cat5e cable with a maximum
length of 100 m is used, the connected device can be supplied with a power of 12.95 W.
Note
The total power provided by the SCALANCE X308-2M PoE on all four PoE ports is a
maximum of 30.8 W.
The PoE ports meet the conditions listed in the IEEE 802.3af / IEEE 802.3at standard
(type 1) for environment A , in other words power supply over Ethernet within a power supply
system. For details of configuring and enabling PoE for individual ports, refer to the
configuration manual SCALANCE X-300 / X-400 on the accompanying CD.
Possible attachments
The X308-2M PoE is a partially modular device and has 4 fixed ports and 2 slots for media
modules.
●
4 electrical ports
4 PoE-compliant RJ-45 jacks with securing collars for connection of end devices or
network segments. Non PoE-compliant end devices can also be connected to the PoE-
compliant RJ-45 jacks because the X308-2M PoE checks that the end devices are
suitable for the PoE function before applying the power.
●
4 modular ports via 2 module slots
2 media modules each with 2 ports are combined optically or electrically via the slots S1
and S2 depending on the application.
End devices and other network segments are connected according to the media modules
being used.
