
Industrial Ethernet Networks
2-9
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
S Parallel Communication
Switches have the capability of handling multiple data packets between different
network segments or nodes simultaneously.
Depending on the number of ports the switch has, it establishes several
temporary and dynamic links between different pairs of network
segments/terminals.
The result is an enormous increase in the network’s data throughput, and a
considerable increase in network efficiency.
networkto approx. 40%
LAN
Segment A
Segment B
Segment C
Segment D
LAN
Segment A
Segment B
Segment C
Segment D
Data traffic
Switched LAN
Shared LAN
S Each individual segment has the full
range of performance / data rate
S Simultaneous data traffic in several
segments; several frames
S Filtering:
Local data remains local; only
selected packets go beyond segment
limits
S All nodes on the network share the
network performance / data rate
S Collisions reduce the efficiency of the
network to approx. 40%
S All data packets pass through all
segments
S At any one time, only one frame on
the network
Figure 2-1 Switched LAN / Shared LAN Compared
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