Some network measurement technology concepts are extensive and challenging to understand from a couple of lines of explanation. These articles delve deeper into the most common concepts that you may run across while using Qosium.
Where to install measurement agents and measurement controllers, what can be measured, how to set the parameters, etc. That is what understanding measurement topology is all about. It is one of the key things regarding QoS measurements.
Packet filter is one of the essential concepts in passive measurement. An active measurement tool pushes a predetermined data stream into the network, so the traffic to be measured is always known. In passive measurement, on the other hand, existing traffic is measured, so filters are needed to define what part, in particular, of the total traffic is the interesting one to be taken into the measurement.
In short, passive QoS measurement is about measuring QoS statistics for real existing application traffic in the network. This is a significant difference to most other network performance measurement solutions available. Passive QoS measurement is the optimal way to measure and monitor network performance after commissioning.
Quality of Experience (QoE) indicates how satisfied the user is for using the application/service. QoE is always an application-specific measure, and the actual result can vary from person to person. This section introduces how QoE can be estimated automatically and in real-time for a connected application without consulting the user.
Quality of Service (QoS), when measured in communications networks, indicates the overall performance of the connectivity. For measuring the network QoS, the most common QoS statistics include delay, jitter (delay variation), and packet loss. As statistics already indicate, QoS is always a measure carried out between two points of interest in the network. Qosium measures QoS from network traffic level, indicating the QoS experienced by applications.
When measuring one-way delay, clock synchronization between the measurement points is essential. Here you find some basic information on synchronizing clocks and finding the best solution for your needs.