Two components connected to a link segment can exchange information about the transfer
and can adapt their settings to each other. The mode with the highest possible speed is set.
Note
• If a port is set permanently to full duplex, the connected partner port must also be set to full
duplex.
• If a port operating in the "Auto negotiation" mode is connected to a partner port that is not
operating in the"Auto negotiation" mode, the partner port setting must be xed at 100 Mbps
or 10 Mbps half duplex mode.
• If you disable the "Auto negotiation" function, the "MDI/MDI-X autocrossover" function is also
turned o. Then use a crossover cable.
Fast Retrain
The devices support the Fast Retrain function in accordance with standard IEEE 802.3. The Fast
Retrain function ensures that no link interruptions occur in the case of electromagnetic
interferences (EMI) on the connection cable to the partner.
If a Fast Retrain event occurs, the device tries to reestablish the communication to the
partner device for a duration of up to 30ms. Only if this is unsuccessful, is the link
disconnected.
During the Fast Retrain procedure no telegrams are transferred via the aected connection.
Note
The function is always enabled and cannot be deactivated.
The function is relevant only for 10 Gbps ports.
There are no Fast Retrain events for port speeds ≤ 1Gbps.
Connecting up
6.6Industrial Ethernet
SCALANCE XR-300
72 Operating Instructions, 03/2023, C79000-G8976-C586-02
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