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I signed a contract with my ISP for ADSL and internet speed should be 16 mbps. However, speedtest.net says I have only 7.5 mbps.

Here's the router info:
SNR Margin: 16.8
Line Attenuation: 25.0
Data Rate: 8192 kbps
Max Rate: 16972 kbps

Does it mean that ISP has locked my internet speed to 8 mbps, and what's the max speed that I can get based on these statistics?

Thank you!

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closed as off topic by EEAA, Stefan Lasiewski, Shane Madden, Dave M, HopelessN00b Aug 31 '12 at 18:16

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Ask your ISP. Seriously, how can any of us be expected to know what their configurations or policies are? –  EEAA Aug 31 '12 at 18:10
    
Is your router ADSL2+? Your speed seems to be limited by something, either your CPE, or from your provider. –  Peter Aug 31 '12 at 18:12
    
I just need to know what Data Rate and Max Rate mean? I called the support, and operator doesn't know what to answer because he's reading the answers from some paper. Sad but true. So, do you know what is the max. internet speed that I get based on Max Rate, SNR margin, and Line Attenuation –  šljaker Aug 31 '12 at 18:13
    
Yes, this it is possible for them to do this, but the speed also depends on the wiring quality in your house, and the phone line quality between your ADSL modem and their equipment at the central office. You will need to ask your ISP for details. –  Stefan Lasiewski Aug 31 '12 at 18:13
1  
@šljaker Serverfault.com is not a good place to ask ADSL questions. You might want to check the answers on superuser.com . Here's good place to start: superuser.com/questions/tagged/dsl?sort=votes –  Stefan Lasiewski Aug 31 '12 at 18:16

1 Answer 1

You probably ought to do a bit of research on how traffic actually moves around the internet.

That bandwidth figure your ISP gives you is only for traffic between your modem and their DSLAM, or perhaps their core routing layer. Once traffic goes beyond that (e.g. to the speedtest.net server), they have no control over it.

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