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2 Local Area Networks
2.2.2 Star connection
2.2.2
Star connection
The star topology is today probably the most widely used type of connection in a hierarchically
organized process.
Although the cabling expenditure is lower than with meshed networks, it is still relatively high,
as in most cases the distances between master and the lower-level controls are rather long.
The master station must have one interface for every node; with larger systems, the masters
themselves can form a hierarchical structure.
The internode communication between two lower-level systems has to be executed over the
master which results in an additional burden and an availability bottleneck.
Process communication star topology
•
Corresponds to the hierarchical organization of the process
•
Linear extension cost
•
Only at the master station are many interfaces necessary
•
Internode communication is executed via the master node
•
Master station is availability bottleneck
•
Simple diagnostics
•
Simple to configure
•
Different transmission media can be used
2–10
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