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Off-line
Access control system not connected to a central computer.
On-line
Access control system connected to a central computer.
OSD
On-Screen Display. The ability of a camera or a piece of camera control equipment to display its set-up menu on a display monitor. Thereby greatly simplifying installation.
OSI (Open System Interconnection)
An architectural model developed by the ISO for the design of open systems networks. All communication functions are divided into seven standardised layers: Physical, Data Link, Network, Transport, Session, Presentation and Application.
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