Specifications

Description
3.3 System description of SCALANCE X-400
SCALANCE X-400 BA
Operating Instructions, 03/2009, C79000-G8976-C186-07
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● Half duplex
● Full duplex
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.
3.3.2.3 100Base-FX
Transmission rate
The transmission rate of the optical Fast Ethernet ports is 100 Mbps.
Transmission mode
Transmission with 100Base-FX is defined in the IEEE 802.3u standard and is specified as
100 Mbps transmission rate and full duplex.
Transmission medium
Data transmission is over multimode or single mode fiber-optic cable (FOC).
Two FOC types can be used:
● Multimode FOC
The core diameter is 50 µm; the light source is an LED. Many modes are used for signal
transmission. The propagation times of the light pulses (dispersion) restrict the maximum
range considerably.
● Single mode FOC
The core diameter is 9 or 10 µm; the light source is a laser diode. To transmit a signal,
only one mode is used greatly reducing dispersion. As a result, the maximum range of
single mode FOC is greater than that of multimode FOC.
Regardless of the type used, the outer diameter of the FOC is 125 µm.