Siemens SCALANCE X-200 - Manual (Page 17)

Product Characteristics
4.1 SCALANCE X108
4.1.4 SCALANCE X108 TP Ports
Connector Pinout
On the SCALANCE X108, the twisted-pair ports are implemented as RJ-45 jacks with MDI-X
assignment (Medium Dependent Interface–Autocrossover) of a network component.
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 a maximum of
100 m is permitted between two devices.
Autonegotiation
Autonegotiation means the automatic detection of the functionality of the port at the opposite
end. Using autonegotiation, repeaters or DTEs can detect the functionality available at the
port of a partner device allowing automatic configuration of different types of device. With
autonegotiation, two components connected to a link segment can exchange parameters
and set themselves to match the supported communication functionality.
Note
Devices not supporting autonegotiation must be set to 100 Mbps/ half duplex or 10 Mbps
half duplex.
Note
The SCALANCE X108 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.
Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line
Commissioning Manual, 1,
4-3