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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.
Most of the functionality in the OSI model exists in all communications systems, although two or three OSI layers may be incorporated into one. OSI is also referred to as the OSI Reference Model or just the OSI Model. Application (Layer 7) OSI Model, Layer 7, supports application and end-user processes.