Description of the device
4.3 Interfaces and signaling contact of the switches
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
87
4.3.1.2 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.
Transmission medium
Data is transmitted over an eight-wire twisted pair cable.
NOTICE
For data transmission at 1 Gbps, at least a Cat 5e twisted-pair cable with 4 x 2 wires is
necessary. With a four-wire cable (2 x 2 wires), a maximum data transmission rate of 100
Mbps is possible.
Transmission range
The maximum transmission range (segment length) is 100 m.
Connectors
The connectors used are 8-pin RJ-45 jacks.
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