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Description

2.1 Basic information on Ethernet switching

SCALANCE X-300

8 Operating Instructions, 01, A5E01113043

Technical options (network topologies)

The IE Switches X-300 simplify the expansion of a network regardless of the network

topology.

You can use an IE Switch X-300 in the following network topologies:

• Linear structure

• Star/tree structure

• Ring with redundancy manager

The maximum cable length is 10 km for single mode gigabit transmission. A mixed topology

between IE Switch X-300s and OSMs/ESMs is possible on the optical ports. Mixed operation

in the topology between SCALANCE X308-2 and an OSM over the optical ports is not

possible because the SCALANCE X308-2 only supports gigabit.

Using an IE Switch X-300 as the redundancy manager in a ring with redundancy manager

provides greater availability. If there is an interruption on the connection between these

switches, the IE Switch X-300 used as redundancy manager acts like a switch and in a very

short time creates a line from the ring with redundancy manager. As a result, a functional,

end-to-end structure is restored. For information on this topic, refer to the Configuration

Manual "SIMATIC NET; Industrial Ethernet Switches SCALANCE X-300 SCALANCE X-400."

2.1.1 Linear structure

Functional description

Linear structures can be created with the IE Switches X-300. The cascading depth and total

span of a network are limited only by the signal propagation times of the communication

connections.

Properties of the linear structure

Each IE Switch X-300 communicates over a TP or FO cable with a neighboring Ethernet

switch. Communication is possible over the optical or the electrical ports.

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