Siemens SCALANCE X-000 Operating Instructions Manual page 14

Description of the device
3.3 TP ports (twisted pair)
Two components connected to a link segment can exchange information about the data
transfer and can adapt their settings to each other. The mode with the highest possible
speed is set.
Note
Setting ports with a fixed configuration
Devices not supporting autonegotiation must be set permanently to 100 Mbps half duplex or
10 Mbps half duplex.
Auto polarity exchange
If the pair of receiving cables is connected incorrectly (RD+ and RD- interchanged), the
polarity is adapted automatically.
Note
The SCALANCE X-000 IE switches are plug-and-play devices that require no settings during
commissioning.
MDI / MDI-X autocrossover function
With the MPI/MDI-X autocrossover function, the send and receive contacts of an Ethernet
port are assigned automatically. The assignment depends on the cable with which the
communications partner is connected. This means that it does not matter whether the port is
connected using a patch cable or crossover cable. This prevents malfunctions resulting from
mismatching send and receive lines. This makes installation much easier for the user.
The SCALANCE X-000 devices support the MDI / MDI-X autocrossover function.
Insulation between the TP ports
NOTICE
Formation of loops
Note that the direct connection of two ports or accidental connection over several switches
causes an illegal loop that can cause network overload and failure.
Devices with port groups
On the following devices, the ports are divided into port groups.
● SCALANCE X005
6GK5 005-0BA00-1AA3
● SCALANCE X005TS
6GK5 005-0BA00-1CA3
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Operating Instructions, 09/2016, C79000-G8976-C344-02
SCALANCE X-000