sanntider

Sanntid is the Norwegian term for real time. The plural sanntider refers to real-time intervals, events, or processes, and is used across technology, science, and everyday language to emphasize immediacy and deadline-aware operations. In computing and data processing, sanntid describes systems that must produce correct results within a specified deadline rather than eventually.

In practical use, sanntider are common in domains where timing is critical: industrial automation and process control, robotics and avionics, telecommunications, online trading, and media streaming. A real-time system is designed to guarantee responses within predetermined time limits, regardless of other work the system handles.

Real-time systems are often categorized as hard real time, where missed deadlines constitute a system failure, and soft real time, where deadlines are important but occasional misses are tolerable. Achieving determinism relies on specialized scheduling, priority schemes, and careful management of I/O and interrupts. Real-time operating systems (RTOS) provide these capabilities.

Key concepts include latency, or the delay between an input event and the system's response, and jitter, the variation in latency. Synchronization of clocks, such as with real-time clocks (RTC) and network time protocols (NTP), supports distributed sanntider. Real-time data, video, and audio must be delivered with minimal and predictable delay to preserve usability and safety.

See also: real-time computing, real-time operating system, hard real-time, soft real-time, RTC, NTP.