Description of the device
3.3 TP ports (twisted pair)
SCALANCE X-100
Operating Instructions, 12/2016, A2B00060666-08
21
RJ-45 connector pinout
With SCALANCE X-100, the twisted-pair port is designed as an RJ-45 jack with MDI-X pin
assignment (Medium Dependent Interface Autocrossover) of a network component.
Special features of the SCALANCE X108PoE
Over and above the pure Ethernet functionality, ports 1 and 2 of the SCALANCE X108PoE
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.
To supply PoE end devices, 4 or 8-wire connecting cables can be used (according to IEEE
802.3).
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.
Pin number
Assignment
Additional pins P1, P2 of the SCALANCE X108PoE
Pin 8
n. c.
-
Pin 7
n. c.
-
Pin 6
TD-
positive supply voltage
Pin 5
n. c.
-
Pin 4
n. c.
-
Pin 3
TD+
positive supply voltage
Pin 2
RD-
negative supply voltage
Pin 1
RD+
negative supply voltage
