Introduction To Network Performance Test


Ray understands that the Network Performance is a different metric as compared to raw speed achieved by running a speed test. 

The Network Performance metric is especially important in Network Sensitive applications like Voice calls, VoIP calls, VoWi-Fi calls, etc. 

Hence, Ray measures the below 4 metrics of Network Performance

1. Jitter

Packets transmitted continuously on the network will have differing delays, even if they choose the same path. This is inherent in a packet-switched network for two key reasons. First, packets are routed individually. Second, network devices receive packets in a queue, so constant delay pacing cannot be guaranteed.
This delay inconsistency between each packet is known as jitter. It can be a considerable issue for real-time communications, including IP telephony, video conferencing, and virtual desktop infrastructure. Jitter can be caused by many factors on the network, and every network has delay-time variation

2. Latency

Delay is an important metric in networking that measures the amount of time it takes for a bit of data to move from one endpoint to another. Delay in networking is typically on the scale of fractions of seconds, and can change based on many factors including the location of the endpoints, the size of the packet, and the amount of traffic.

Ray measures Min Latency, Average Latency, and Maximum Latency for the given network. 

3. Packet loss

Packet loss occurs when one or more packets of data travelling across a computer network fail to reach their destination. Packet loss is either caused by errors in data transmission, typically across wireless networks,[1][2] or network congestion.[3] Packet loss is measured as a percentage of packets lost with respect to packets sent.

4. MOS

Mean opinion score (MOS) is a measure used in the domain of Quality of Experience and telecommunications engineering, representing overall quality of a stimulus or system. It is the arithmetic mean over all individual "values on a predefined scale that a subject assigns to his opinion of the performance of a system quality".[1] Such ratings are usually gathered in a subjective quality evaluation test, but they can also be algorithmically estimated.
MOS is a commonly used measure for video, audio, and audiovisual quality evaluation, but not restricted to those modalities. ITU-T has defined several ways of referring to a MOS in Recommendation P.800.1, depending on whether the score was obtained from audiovisual, conversational, listening, talking, or video quality tests.

Since MOS encapsulates the values of Jitter, Packet Loss and Latency in its calculation, Ray uses MOS as the Network Performance Test result. 

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