Jitter (VoIP)

Data transmission is critical. Thus, managing jitter is an important part of data transmission implementation. The three major types of jitter are as follows:

• Random jitter: Usually the result of issues related to clock timing or unpredictable electronic timing noise. Also known as unbounded jitter.
• Deterministic jitter: May be predicted or determined. Reproducible and bounded and may be periodic.
• Total jitter: Calculated by using a bit error ratio (BER), as well as combined random and deterministic jitter. The mathematical formula used to calculate total jitter is: Total jitter=Deterministic jitter+2*BER*Random jitter.

Because jitter management is essential for the successful transmission of voice/video data and computerized signals, there are a number of jitter mitigation techniques, including:

• Jitter buffer: Used to mitigate jitter in video and audio signals transmitted over a network.
• Anti-jitter circuits: Formed by a group of electronic circuits, this technique contains the level of jitter in signal pulses. Re-times output pulses for closer alignment to ideal signal pulses.
• Dejitterizer: This is an elastic buffer in which a signal is temporarily stored and transmitted at the average incoming signal rate. Not effective at mitigating jitter with low frequency.