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
Devices not supporting autonegotiation must be set to 1000 Mbps/ half duplex, 100 Mbps/ half
duplex or 10 Mbps half duplex.
Note
The IE switches of the SCALANCE XB-000 product line are plug-and-play devices that require no
settings during commissioning.
Auto polarity exchange
If the pair of receiving cables is connected incorrectly (RD+ and RD- interchanged), the polarity
is adapted automatically.
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 IE switches of the SCALANCE XB‑000 product line all support the MDI/MDIX autocrossover
function.
Note
Please note that the direct connection of two ports on the IE switch or accidental connection
over several IE switches causes an illegal loop. Such a loop can lead to network overload and
network failures.
4.4.3 Insulation between the TP ports
The insulation between the TP ports is based on the number of TP ports.
The SCALANCE XB004-1 group includes the following devices:
• SCALANCE XB004-1
• SCALANCE XB004-1LD
• SCALANCE XB004-1G
• SCALANCE XB004-1LDG
Description of the device
4.4 TP ports (twisted pair)
SCALANCE XB-000
28 Operating Instructions, 01/2022, A2B00077300-11
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