Network Topologies with OSM/ESM
3.5Coupling Network Segments
A network segment can be connected to each of the ports of an OSM/ESM.
The Ethernet Planning Rules:
•Sum of the delay equivalents and cable lengths in the
•Sum of the variability values in the
need only be maintained as previously in each individual segment (see also "SIMATIC NET Industrial Twisted Pair and Fiber Optic Networks" manual).
The coupling of network segments via OSM has further advantages:
•The collision domain ends at the OSM ports and the network segments attached to them, the permitted total network span increases.
•Only valid data packets are passed on via OSM ports. Network segments with problems cannot influence other network segments.
•Data packets are only passed on to the ports to which the DTE with the destination address is connected. The available transmission capacity increases since the local data traffic of a network segment no longer puts load on another network segment.
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