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ETHERNET ï 103Network Architecture ñ Principles and RegulationsWAGO-I/O-SYSTEM 750ETHERNET TCP/IP5.2.3 Coupler ModulesThere are a number of hardware modules that allow for flexible arrangementfor setting up an ETHERNET network. They also offer important functions,some of which are very similar.The following table defines and compares these modules and is intended tosimplify the correct selection and appropriate application of them.Module Characteristics/application ISO/OSIlayerRepeater Amplifier for signal regeneration, connection on a physicallevel.1Bridge Segmentation of networks to increase the length. 2Switch Multiport bridge, meaning each port has a separate bridgefunction.Logically separates network segments, thereby reducingnetwork traffic.Consistent use makes ETHERNET collision-free.2 (3)Hub Used to create star topologies, supports various transmissionmedia, does not prevent any network collisions.2Router Links two or more data networks.Matches topology changes and incompatible packet sizes (e.g.used in industrial and office areas).3Gateway Links two manufacturer-specific networks which use differentsoftware and hardware (i.e., ETHERNET and Token Ring orETHERNET and Profibus).4-7Tab. 5-2: Comparison of Coupler Modules for Networks |
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