What does this do?

It tests your line speed for upload only as the services we primarily provide are synchronous broadband lines. Upload speeds will be the same as download speeds.  The test server is located in class-5 grade data center for maximum accuracy.

Why do I get very different results from different test servers?

Poor performance on one test server indicates the path from your ISP to that test server is currently congested. For benchmarking your actual line speed, and not the internet, or your ISP, the higher test number is more correct.

Is this test accurate?

This test is a transfer of nearly uncompressible data (actually, mp3 files). The result shown is your data transfer speed. This should be close, but less, than your rated (purchased) line speed. If you can get close to 90% of your rated line speed, everything is perfect!