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Ethernet based Local Area Networks (LANs) have become the most prominent technology that promises to revolutionize automation communications. The advancements in Ethernet technology, from collision-prone, shared 10Mbps LAN, to collision-free, duplex 100Mbps switched LAN and onward to 1000Mbps LAN, Ethernet technology is close to taking over the world of communications. Up until now most long haul or inter-remote communications are provided by SONET or SDH communication infrastructure. These legacy systems, although reliable and well understood, are voice-centric, less flexible, difficult to scale, and most of all are not optimized for packet data transmissions.
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