Connectors
A node or network segment is connected to an 8-pin RJ-45 jack with securing collar. Due to its
flush fitting with an IE FC RJ-45 Plug 180 / IE FC RJ45 Plug 145 connector, the securing collar
ensures a robust connection suitable for industry that provides tensile and bending strain relief
for the inserted connector.
Note
The RJ-45 jacks of the SCALANCE X300EEC variants do not have a securing collar. The
tensile and bending relief are provided by the securing bracket using a cable binder, see also
section Signaling contact (Page 140).
4.5.1.2 1000Base-T
Transmission rate
The transmission rate of the electrical Ethernet ports is 10 Mbps, as Fast Ethernet ports 100
Mbps or as gigabit ports 1 Gbps.
Transmission mode
The transmission mode for 1000Base-T is specified in the IEEE 802.3ab standard.
Autonegotiation (automatic detection of the best transmission mode) is default.
The order in which they are selected is:
● 1000Base-T full duplex
● 1000Base-T half duplex
● 100Base-TX full duplex
● 100Base-TX half duplex
● 10Base-T full duplex
● 10Base-T half duplex
Two communication modes are possible:
● Half duplex
Two-way alternate transmission mode - it is only possible to either send or receive over the
interfaces at any one time.
● Full duplex mode
Two-way simultaneous - both communication partners can send and receive at the same
time.
Description of the device
4.5 Interfaces and signaling contact of the switches
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24 89
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