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What is the meaning of Quality of Service (QoS) and can we measure it? Why is monitoring so important? This video explains how QoS works by means of illustrative examples and how it can be monitored.

Table of Contents:

0:00 - Intro & disclosure
0:06 - Definition
0:40 - Explanation
1:35 - Apply QoS Principles
2:39 - Monitoring
3:07 - Network metrics
4:18 - How to monitor
4:49 - Additional Information

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Quality of service: 3 key questions and answers:
- What is QoS?
Quality of service refers to the quality of a communication service from the point of view of the user. Both the establishment of the connection and the connection communication should be stable, with data packets transmitted free of errors and in their entirety. Quality of service is an extremely important consideration, especially for companies.

- How do you measure quality of service?
Quality of service is measured by four main parameters: packet loss, delay time (latency), deviation (jitter), and the mean opinion score. These four parameters, among others, are measured by PRTG and must fall within specific threshold values to ensure quality of service does not suffer.

- How can I achieve a high quality of service?
As an administrator, it’s your job to monitor and optimize your company’s quality of service. If transmission errors occur, you must be able to quickly identify the problem. To do so, you’ll need QoS software or a QoS program that monitors quality of service and promptly notifies you in the event of disruptions.

Monitoring QoS: The four main parameters
QOS PARAMETER 1: PACKET LOSS
When it comes to quality of service, packet loss plays a vital role. Packets can get lost, or arrive as duplicates or in the wrong order. PRTG captures all three of these scenarios. As a result, administrators can quickly uncover the source of the error. Packet loss may be caused by network overloads, poorly performing devices, or hardware/software errors.

QOS PARAMETER 2: LATENCY
Latency (latency time) also plays an important role in real-time communication. Latency is the amount of time a packet needs to be sent to its recipient and then back to its sender again. Even the smallest delay can have an immediate effect on the quality of the transmission.

QOS PARAMETER 3: JITTER
Jitter is the deviation in the transmission time of a data packet. If jitter buffers are used by the receiver, then certain amounts of jitter are still acceptable from the point of view of the user. As an administrator, you need to be quickly informed of jitter so you can step in and take action at once.

QOS PARAMETER 4: MEAN OPINION SCORE (MOS)
The mean opinion score (MOS) measures the overall quality of voice and image transmissions. It is the average of several valuation parameters. The worst MOS value is 1 (impossible to understand the person on the line despite great effort), while the highest value is 5 (no effort required to understand the voice on the other end of the line).

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