Test the speed of BellSouth's DSL service or any other Internet service provider using the speed test tool on SpeedTest.net or MegaPath.com. For the correct result, you must be connected to the Internet via the BellSouth DSL service you are testing.
At SpeedTest.net, click the Begin Test button near the top of the main page to start the process. This tool tests the download speed and then the upload speed, with the results reported in megabits per second. In the United States, download speeds of 3 to 50 megabits per second are common, while upload speeds are typically about one-fourth of the download speed. Compare the reported speed with what BellSouth guarantees for the package you're paying for and contact the company if it's slower than promised.
At MegaPath.com, type "speed test" in the search box near the top right of the page, and then click the search icon. Click the Speed Test Plus link near the top of the page, click any city on the map, and then click either the Start Test From a Business button or the Start Test From a Residence button to test the download and upload speeds. This website also tests for packet loss, latency and jitter. Data from these tests can sometimes be helpful in diagnosing connection problems, such as when reporting problems to BellSouth technical support.