Unit interval
The Unit Interval , abbreviated to UI , is an auxiliary unit of measurement for evaluating jitter in the context of digital signal processing and is used, among other things, in ITU-T G.810 and in digital video interfaces such as the Serial Digital Interface (SDI).
A unit interval (1 UI) corresponds to the time it takes to transmit a transmission symbol . Due to jitter, deviations occur in the specific duration, which can lead to transmission errors. Typical limit values for jitter are in the range from 0.1 UI to 0.3 UI. From 0.5 UI, the so-called horizontal opening in the eye diagram is closed and symbol crosstalk occurs.
literature
- Mike Peng Li: Jitter, Noise, and Signal Integrity at High-Speed . Prentice Hall, Upper Saddle River NJ et al. 2008, ISBN 978-0-13-242961-0 .
- Dennis Derickson, Marcus Müller: Digital Communications Test and Measurement. High speed physical layer characterization . Prentice Hall, Upper Saddle River NJ et al. 2007, ISBN 978-0-13-220910-6 .