Siemens SIMATIC NET SCALANCE X-100 Series Operating Instructions Manual page 25

Over and above the pure Ethernet functionality, ports 1 and 2 can also be used to supply
power to Power-over-Ethernet end devices (for example SCALANCE-W) in compliance with
802.3af.
The two ports providing PoE are supplied from the same power source. This means that they
are electrically interconnected. They are however isolated from ground, from the ports that
do not provide PoE and from the power connector (24 V). Their use is therefore subject to
the conditions listed in IEEE 802.3af for Environment A.
The ports that do not provide PoE are all isolated from each other.
Ports 3 to 8 do not have the PoE function.
Note
Ethernet devices without PoE functionality can also be connected to ports 1 and 2. A voltage
is applied only after the SCALANCE X108 PoE has detected a PoE end device complying
with the standard at the port.
Figure 3-8
Table 3- 6
Pin number
Pin 8
Pin 7
Pin 6
Pin 5
Pin 4
Pin 3
Pin 2
Pin 1
NOTICE
TP cords or TP-XP cords with a maximum length of 10 m can be connected to the RJ-45
TP port.
With the IE FC cables and IE FC RJ-45 plug 180, an overall cable length of up to 100 m is
permitted between two devices depending on the cable type.
SCALANCE X-100
Operating Instructions, 04, A2B00060666D
RJ-45 jack
Pin assignment of the RJ-45 jack
Assignment
n. c.
n. c.
TD-
n. c.
n. c.
TD+
RD-
RD+
Additional assignment P1, P2
-
-
Positive supply voltage
-
-
Positive supply voltage
Negative supply voltage
Negative supply voltage
Product properties
3.7 SCALANCE X108PoE
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