DSL providers in Germany usually promise DSL Speed Test.of up to 50 Mbit/s. However, with this they simply indicate how much dsl speed test they reserve for your use. Hundreds of kilometers are traveled on the way to your home Internet connection, which affects the data rates. You can use the DSL speed test from testmyinternetspeed.org, to measure how fast the dsl speed test is when it finally reaches you.