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All
Ethernet hubs and switches are basically designed to facilitate
the interconnection of multiple devices on an Ethernet network.
They typically offer three or more Ethernet ports to allow connection
to Ethernet devices such as computers, controllers, RTUs, I/O,
other hubs/switches, etc. The typical network topography for Ethernet
is a star or tree arrangement.
Ethernet
Hub:
The most basic of these devices is the Ethernet hub. It simply
broadcasts each message it receives to every one of its ports.
The downside is that each Ethernet device has to wait for its
turn to 'talk' to the hub, increasing the likelihood of message
collisions; therefore, real-time operation is jeopardized and
determinism is difficult. These are not recommended for or commonly
used in industrial control systems. |
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An
Ethernet Managed Switch has all the plug and play capability of
the common store & forward switch, plus it is highly configurable
and offers advanced capabilities such as SNMP for network management,
RSTP for advanced redundancy, IGMP for multicast filtering, VLANs
for network segregation and more. These switches are also optimized
for control networks such as EtherNet/IP, PROFInet, Modbus/TCP and
Foundation Fieldbus HSE. Click next
for an overview of these powerful features. |
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