Isochronity (from ancient Greek ἰσόχρονος isóchronos , German 'equal to time , equal age' ) is
- the designation of periods of equal duration . In technology , this is a signal with a constant period .
- the property of a technical system, in particular a network or other transmission system, to perform defined tasks within a precisely defined period of time. Isochronous telecommunication networks can transmit error-free at a constant data rate .
With this type of transmission, there is always a fixed number of steps between any two identification points. The time interval between two transmitted bits is always the same. Temporal deviations, which are referred to as jitter , ideally do not exist. In practice they have to be limited.
Since constant clock signals are used in practice, all types of transmission are isochronous at least within a "hierarchy block". Example: The serial RS232 interface referred to as asynchronous sends bytes asynchronously, i.e. at any time - the start, data and stop bits are sent isochronously.
The term isochronous transmission is still used in technology with a slightly different meaning: Here one understands that a certain, minimum data rate is guaranteed (e.g. Firewire , USB ...). This is important for multimedia ( video on demand, etc.) or real-time applications (air traffic control, etc.) , for example .
- In clocks , the uniformity of vibrations is called isochronism , i.e. their frequency constancy , which is independent of external interference.
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