Siemens SCALANCE X005 Inbetriebnahmehandbuch Seite 46

Product Characteristics
4.4 SCALANCE X005 TP Ports
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.
Auto polarity exchange
If the receive line pair is incorrectly connected (RD+ and RD- switched), the polarity is
automatically adapted.
Note
The SCALANCE X005 is a plug and play device which does not require settings 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 SCALANCE X005 device supports the MDI / MDIX autocrossover function.
Notice
Fixed configured ports of partner stations must be set to 100 Mbps/ half duplex or 10 Mbps
half duplex.
Notice
Please note that a direct connection of two ports or an unintentional connection via several
switches causes an unpermissible loop which may cause network overload and network
failures.
4-4
Industrial Ethernet SCALANCE X005
Commissioning Manual, A2B00051528A