Siemens X-200 User Manual

Product Characteristics 

 

4.5 SCALANCE X204-2 

port of a partner device allowing automatic configuration of different types of device. With 

autonegotiation, two components connected to a link segment can exchange parameters 

and set themselves to match the supported communication functionality.  

 

 

Note 
Devices not supporting autonegotiation must be set to 100 Mbps/ half duplex or 10 Mbps 

half duplex. 

 

 

 

Note 
The SCALANCE X204-2 is a plug-and-play device that does not require settings to be made 

for commissioning. 

 

MDI /MDIX Autocrossover Function 

The advantage of the MDI /MDIX autocrossover function is that straight-through cables can 

be used throughout and crossover Ethernet cables are unnecessary. This prevents 

malfunctions resulting from mismatching send and receive wires. This makes installation 

much easier for the user.  
The devices of the SCALANCE X-100 and X-200 product lines all support the MDI / MDIX 

autocrossover function. 

4.5.5 

SCALANCE X204-2 FO Ports 

Transmission speed 

The transmission rate of the optical Fast Ethernet ports is 100 Mbps. 

Transmission Mode 

The transmission mode for 100Base-FX is specified in the IEEE 802.3u standard. 
Since the full duplex mode and the transmission rate cannot be modified for optical 

transmission, autonegotiation cannot be selected. 

Transmission Medium 

Data transmission is over multimode fiber-optic cable (FOC). The wavelength is 1310 nm. 
Multimode FOC with a core diameter of 50 or 62.5 µm is used, the light source is an LED. To 

transmit a signal, many modes (light rays) are used 
The outer diameter of the FOC is 125 µm. 

 

Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line 

4-38

 

Commissioning Manual, 1,