Description of the device
4.3 Interfaces and signaling contact of the switches
SCALANCE X-300
94 Operating Instructions, 05/2016, A5E01113043-20
Transmission with 1000Base-SX is defined in the IEEE 802.3z standard and is specified as
1000 Mbps transmission rate and full duplex.
Data is transmitted over multimode FOC. The wavelength is 850 nm.
The core diameter of the multimode FOC is 50 µm; the light source is an LED. Many modes
(light beams) are used for signal transmission. The propagation times of the light pulses
(dispersion) restrict the maximum range considerably.
The maximum transmission range (segment length) is 750 m when using SIMATIC NET
fiber-optic multimode FOC with SC duplex connectors.
SC duplex female connectors are used.
On the IE Switches X-300EEC, devices are connected via LC jacks.
1000Base-LX / 100Base-FX
Transmission rate
The transmission rate of the optical gigabit ports is 1 Gbps.
Transmission with 1000Base-LX is defined in the IEEE 802.3z standard and is specified as
1000 Mbps transmission rate and full duplex.
Data is transmitted over single mode FOC. The wavelength is 1310 nm or 1550 nm.
The core diameter of the single mode FO cable is 9 or 10 µm; the light source is a laser
diode. To transmit a signal, only one mode (light beam) is used greatly reducing dispersion.
As a result, the maximum range of single mode FOC is greater than that of multimode FOC.
The maximum transmission distance (segment length) is 120 km for 1000Base-LX
transmission.
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