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Configuring Networks

3-23

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

The same checks must also be performed for other paths (for example node 1 <->

node 4, node 3 <-> node 4). The configuration is only correct when the limit values

are not exceeded by any of the paths.

Note

The path of nodes 1, 3, 4 and 5 to node 2 only needs to be checked as far as the

first OSM. Due to the way in which the OSM works (“store-and-forward

switching”), every collision domain ends at the port of an OSM.

3.3 Switched LANs

Switched Connection Paths

The main feature of switched LANs is that the connection paths for each data

packet are switched based on the data destination address. At any point in time,

several different data packets can be in transit through the network on different

connection paths. The data packets are transported only through segments that

lead to the receiver. The products that operate according to the switching method

and are therefore used to form switched LANs include the OSM and ESM.

End of the Collision Domain

A further feature of OSMs/ESMs compared with the shared LAN products (OLM

and ELM) is that the collision domain ends at the port of an OSM/ESM. In terms of

configuration, this means that delay equivalents and path variability values do not

need to be checked on connections between OSMs/ESMs.

When structuring the network, you only need to make sure that the permitted

maximum lengths of TP and FO cables are not exceeded.

Up to 50 OSMs/ESMs can be cascaded in a ring or bus structure.

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Siemens SIMATIC NET Instrucciones de operaciones Pagina 49