Jitter in networking refers to the variation in the time delay between when a signal is transmitted and when it is received over a network connection ¹ ² ³. This can be caused by network congestion, packet loss, different packet arrival times, network interference, inadequate bandwidth, routing issues, network equipment issues and improper queuing ². Jitter can negatively impact the quality of real-time applications such as video conferencing, voice over internet protocol (VoIP) calls and online gaming ¹ ² ³. Here are some key points to know about jitter in networking:

*What is Jitter?*
- Jitter is the variation in time delay between when a signal is transmitted and when it's received over a network connection.
- Jitter is measured in milliseconds (ms) and is described as the disruption in the normal sequence of sending data packets.
- Good connections have a reliable and consistent response time, which is represented as a lower jitter score.

*Causes of Jitter*
- Network congestion
- Packet loss
- Different packet arrival times
- Network interference
- Inadequate bandwidth
- Routing issues
- Network equipment issues
- Improper queuing

*Effects of Jitter*
- Poor quality of real-time applications such as video conferencing, VoIP calls and online gaming
- Choppy or distorted audio and video
- Delayed or lost packets
- Disruption in the normal sequence of sending data packets

*Acceptable Jitter*
- For voice calls over the internet, jitter should stay under 150 milliseconds to prevent choppiness.
- Video chatting requires lower, more consistent jitter - around 30 milliseconds or less is ideal.
- Up to 200 milliseconds of jitter may be tolerable before video quality drops noticeably.
- Gaming and virtual reality have the strictest jitter requirements as they rely on extremely responsive data transmission. For smooth gaming, aim for 30-50 milliseconds or less.

*Mitigating Jitter*
- Upgrade bandwidth
- Optimize packet buffers
- Traffic shaping
- Dynamic routing
- Queue management
- Fault tolerance
- Monitoring

In networking, jitter refers to the variation in the delay of packet arrival time between consecutive packets in a data stream. It is a measure of the inconsistency or variability in packet delivery time and can impact the quality of real-time communication applications such as voice over IP (VoIP), video conferencing, and online gaming.

Key points about jitter in networking:

1. **Causes:** Jitter can be caused by various factors, including network congestion, packet loss, routing inefficiencies, fluctuations in network latency, and queuing delays at network devices such as routers and switches. These factors can lead to unpredictable variations in packet arrival times, resulting in jitter.

2. **Effect on Quality:** High levels of jitter can degrade the quality of real-time communication applications by causing disruptions, delays, and synchronization issues. In VoIP calls, for example, excessive jitter can result in choppy audio, dropped packets, and poor call quality. In video streaming, jitter can cause buffering, stuttering, and out-of-sync audio and video.

3. **Measurement:** Jitter is typically measured in milliseconds (ms) and is calculated as the difference between the maximum and minimum packet arrival times within a defined time interval. Network monitoring tools and diagnostic utilities, such as ping, traceroute, and network performance monitoring software, can be used to measure and analyze jitter on a network.

4. **Tolerance Levels:** Different real-time communication applications have different tolerance levels for jitter. For example, VoIP calls typically require low jitter (e.g., less than 30 milliseconds) to ensure clear and consistent voice quality, while video streaming and online gaming may tolerate slightly higher levels of jitter without significant degradation in performance.

5. **Mitigation:** To mitigate jitter and improve network performance, network administrators can implement various strategies, including traffic prioritization, quality of service (QoS) policies, traffic shaping, buffer management, and network optimization techniques. These measures help to reduce network congestion, prioritize time-sensitive traffic, and minimize the impact of jitter on real-time applications.

Overall, jitter is an important metric in network performance monitoring and management, as it can affect the quality, reliability, and user experience of real-time communication applications. By understanding the causes and effects of jitter and implementing appropriate mitigation strategies, organizations can ensure optimal network performance and deliver a seamless user experience for voice, video, and interactive applications.