Connection Quality Issues

MySpeed Quality of Service (QoS)

Definition: What is QoS, or Quality of Service? If the graps below would be typical download rates over a time frame from two different broadband ISPs, both providing an average of 3 Mbps, which service provider would assure you te the higher quality of service?

Provider A Connection Speed Provider B Connection Speed

Measouring the data transfer over a 5 second period, both ISPs have delivered 15 Mbps of data (average of 3 Mbps). But which of them is offering the better connectivity service overall? The answer to that question may be ambiguous. Because it completely depends on the user's application.

If your network usage is tipically web browsing, then you would't notice much difference between the two connections. However if your application is in real time, souch as VoIP or multimedia broadcasting, then a connection with provider A would give you a much better user experience than the fluctuating connection of provider B.

By this reason the first Provider should win and that is the basis for the MySpeed Quality of Service measurement. Being able to provide a consistent download capacity is what quality of service is all about. Our online speed test's quality of service rating is based on a very simple calculation:

minimum speed
————————————— = Quality of Service
maximum speed

which is the lowest transfer speed during a large download divided by the maximum speed observed, resulting in a percentage number from 0 (worst) to 100 (best). The higher the percentage, the better the quality of service. Variation in the download rate is undesirable and is penalized (resulting is a lower percentage number).

In the example graphs above, the QOS for ISP A is 100% (5/5), and the QOS for ISP B is 20% (1/5).

Please note that the MySpeed QOS percentage is independent of line speed. The above graphs could be Kbps instead of Mbps and the providers would still obtain the same QOS numbers. This is by design. The MySpeed QOS metric measures line quality, not line speed.

xDSL: On a xDSL connection, you can expect to see a consistently high QOS number (when you are the only person using the DSL connection). If you don't, contact your DSL provider to file a problem report.

T1 Line: For example, on a virtually unused T1 line (1.544 Mbps), MySpeed repeatedly reported a download speed of 1.46 Mbps and an upload speed of 1.44 Mbps, and as you expect, a QOS in the upper 90's.

Cable Modem: On a high quality cable modem network, you can expect a QOS in the 90's or 80's. However, because you have the potential for sharing your connection with everyone in your neighborhood, some low quality networks will see lower numbers, sometimes even below 10!

Voice over IP (VoIP), Multimedia: For today's popular multimedia, IP telephony and similar bandwidth-hungry applications, consistent download capacity and a high QOS are imperative. Fluctuating bandwidth frequently results in jitter and broken connections. More information.

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