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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.
The Open Systems Interconnection (OSI) model is a protocol used to communicate between different networks. Protocols are nothing but a set of rules used to communicate between two networks. The Open Systems Interconnection (OSI) model is divided in seven layers. Reference from Google. OSI Model divided in two parts upper level and lower level. The OSI Model is also divided in two parts; upper level and lower level. The lower level contains a physical layer, data link layer and network layer.