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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
This is why we need The OSI network reference model. The Open Systems Interconnection model is a networking reference model. OSI model was made by the International Organization for Standardization to provide a framework on which to build a suite of open systems protocols.