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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 OSI model is a seven-layer model developed around five specific design principles: Whenever a discrete level of abstraction is required, a new layer should be created. Each layer of the model should carry out a well-defined function. The function of each layer should define internationally standardized protocols. The boundaries of the layers should be placed to minimize the flow of information across interfaces.