The download speed stands for the direction of data transmission from the Internet to you. In connection with the data speed of this transmission direction, the download parameter is accompanied by b/s as the basic unit, while more often you can see Mbps (megabites per second), or Gbps (gigabites per second). The resulting download speed which is part of the result of your test carried out by the CTU NetTest measurement tool is the actually achieved speed in the given measurement interval. For carrying out one test by the NetTest tool, it is 10 seconds. This actually achieved speed characterises the real performance of Internet access service (IAS).
It is important to notice that the download speed value corresponds to the transport layer of your IAS (the Internet connection) using the TCP protocol, i.e. the most often used transport layer protocol, from the end user’s point of view. The download speed value should be in the range of values of the maximum speed and the normally available speed for most of the day (95 % of daytime). These values can be found in your contractual conditions (e.g. in the contract on the provision of IAS, in Terms and Conditions, or in Price list, etc.). The download speed can decrease below the value of the normally available speed for a short time, but not in such a way that this decrease would cause appearance of significant discrepancies or even service outage. Service outage means a situation when the download speed decreases under the maximum speed value as stated in contractual conditions. In these cases, you can apply your right to submit a claim against a defective service provision to your IAS provider.