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  High-end automation may still include service as part of the installation, but increasingly, past initial purchase (and perhaps, installation), a service agreement may be needed with an automation vendor to ensure efficiency and return on investment. After all, the very word investment implies return; otherwise it's called cost. Control Engineering
• Ethernet Explained
  Ethernet was born in 1973 when Xerox's Bob Metcalfe sketched the basic concept on a napkin now archived at Xerox's Palo Alto Research Center. Originally designed for interoffice communications, Ethernet's performance and applications have expanded considerably in recent years. The original standard operated at 2. Control Engineering