Operating instructions

Product properties
3.8 SCALANCE X208PRO
Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line
3-22 Operating instructions, 09/2006, A5E00349864 Release 7
Note
Devices not supporting autonegotiation must be set to 100 Mbps/ half duplex or 10 Mbps
half duplex.
Note
The SCALANCE X208PRO is a plug-and-play device that does not require settings to be
made for commissioning.
MDI /MDIX autocrossover function
The advantage of the MDI /MDIX autocrossover function is that straight-through cables can
be used throughout and crossover Ethernet cables are unnecessary. This prevents
malfunctions resulting from mismatching send and receive wires. This makes installation
much easier for the user.
The devices of the SCALANCE X-100 and X-200 product lines all support the MDI / MDIX
autocrossover function.
Notice
Please note that the direct connection of two ports on the switch or accidental connection
over several switches causes an illegal loop. Such a loop can lead to network overload and
network failures.
Auto polarity exchange
If the pair of receiving cables are incorrectly connected (RD+ and RD- swapped over), the
polarity is reversed automatically.