Siemens X-400 - Manual (Page 24)

System Description of SCALANCE X-400
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
24 C79000-G8976-C186-03
2.2 Ports of SCALANCE X-400
SCALANCE X-400 provides you with electrical ports that can be used as gigabit
and ring ports. The expansion with media modules provides you with additional op-
tical ports. By using an extender module, you can increase the number of ports by
a maximum of eight ports.
2.2.1 10Base-T / 100Base-TX
Transmission Rate
The transmission rate of the electrical ports is 10 Mbps or as fast Ethernet ports
100 Mbps.
Transmission Mode
The transmission mode for 10Base-T / 100Base-TX is specified in the IEEE 802.3i
/ IEEE 802.3u standards of the Institute of Electrical and Electronic Engineers.
Autonegotiation (automatic detection of the best transmission modes) is standard.
The order in which they are selected is:
● 100Base-TX full duplex
● 100Base-TX half duplex
● 10Base-T full duplex
● 10Base-T half duplex
Two communication modes are possible:
● Half duplex mode
two-way alternate - it is only possible to either send or receive over the inter-
faces at any one time.
● Full duplex mode
two-way simultaneous - both communication partners can send and receive at
the same time.