Siemens SCALANCE X-400 Operating Instructions Manual page 110

Connecting
5.2 Ports
Fast Ethernet transfer with FOC
Data transmission at 100 Mbps is over multimode FOC or single mode FOC. In both cases,
the BFOC plug on the fiber-optic cable is plugged into the BFOC socket. When using the LH
module, SC duplex sockets are used as the connectors.
When a media module is inserted, the front two sockets belong to port 1 and the two back
sockets to port 2. The front socket is the input and the rear socket the output socket of the
respective port. Behind the labeling strip on the front of the media module, you will see the
relevant symbols.
Note
Fiber-optic cable connectors are susceptible to contamination and mechanical damage to
the face. Protect open connections with the supplied dust caps.
Figure 5-11
110
BFOC plug with Fast Ethernet media module MM491-2
Operating Instructions, 06/2015, C79000-G8976-C186-12
SCALANCE X-400