The ADSL and ADSL2+ line speed calculator

Use the form below to enter the line stats from your ADSL/ADSL2+ router.

This site will then calculate what sort of connection speed you should expect from your broadband connection, and give you a set of indicators as to whether your current stats fall within the normal range. View Results

If you do not know where to get the attenuation, connection speed (bandwith) and noise margin (SNR) figures from for your ADSL or ADSL2+ router, then take a look at this guide for where the information is stored on a number of routers.

Why not check your connections speed

If the result from a speed test is massively lower than your connection, wander over to forums.thinkbroadband.com with a copy of your speed test results and router statistics.

The normal speed range displayed after the calculation reflects the speed you should expect to get for a line that is performing fairly well. The speeds alongside the varying target noise margins take into account your current noise margin, this can sometimes under estimate your speed if your provider uses power backoff techniques (e.g. Sky).

Results

Link to this result: http://www.coolwebhome.co.uk/calc/index.php?param=RG4gNDAwMCBEbiA1MCBEbiA2LjYgRG4gMA==#res

You can give out this URL to other people to show them the results if you want some further explanation.

Estimated speed using ADSL mode (max 8 Mbps)
Green traffic light, actual speed is good
Good
Expected speed at 50dB attenuation
3200Kbps to 4630Kbps

Below is an estimate of the speed based around your current sync speed and the supplied noise margin.

Estimated speed if you switch to ADSL2 mode (G.992.3)
Yellow traffic light, actual speed is slightly low
Slightly low
Expected speed at 50dB attenuation
3700Kbps to 4600Kbps

Below is an estimate of the speed based around your current sync speed and the supplied noise margin.

Estimated speed if you upgrade to ADSL2+ (G.992.5)
Yellow traffic light, actual speed is slightly low
Slightly low
Expected speed at 50dB attenuation
3750Kbps to 6000Kbps

Below is an estimate of the speed based around your current sync speed and the supplied noise margin.

If after running your routers statistics through the checker you are told the results are bad, you may want to consider testing using the test socket at your BT Master Sockets test socket, i.e. remove the faceplate. If this improves the connection (sync) speed or noise margin figures and gives a better result in the calculator, consider investing in filtered ADSL faceplate, or the newer VDSL Interstitial faceplate. Alternatively disconnecting the ring wire or fitting an I-Plate to filter the ring wire alone may improve your speeds.