The speed test of an ADSL connection can also vary greatly within a short time interval (e.g. 5 minutes).
To calculate the speed of an ADSL connection, the best sites are these:
Internet Speed Test – AT&T Official Site (att.com)
Speedtest by Ookla - The Global Broadband Speed Test
Google internet speed test - Test internet on all your devices with easy and fast and safe.
Internet Speed Test — Check Your Speed | HighSpeedInternet.com
Speed test - how fast is your internet? | DSLReports, ISP Information
Speakeasy Internet Speed Test - Check Your Broadband Speed | Fusion Connect
