About the SG DSL Speed Calculator The SG DSL Speed Calculator is a tool for quick estimation of the maximum attainable ADSL/ADSL2+/VDSL sync speed based on signal attenuation. I recently received a flyer in the ma ... Find out more. uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. The following table shows the speeds that you can expect from an ADSL connection. Calculate speed, distance or time using the formula d = st, distance equals speed times time. If you’ve got an ADSL connection, the main factor is the distance data has to travel. To use the calculator simply fill in the downstream attenuation number (dB) from your DSL modem, and all other values will be calculated automatically. This is purely for indication only and should not be classed as the Line Speed that you would receive on any ADSL or LLU product from another ISP. Click on this link to Sam Knows website, click on availability checker on left, enter phone number and postcode then search, when results come up click on Bt Adsl and it will show you your distance from exchange (straight line) and what speeds are available, also click the links to see about cable, llu etc Fibre to the Cabinet (FTTC) broadband comes in three main variants which offer a downstream line connection speed of 80 meg (80 Mbps), 55 meg (55 Mbps) or 40 meg (40 Mbps), but the actual maximum throughput speed of the service will be slightly lower than this at around 76 / 52 / 38 Mbps. I currently have ADSL with a typical download speed of 6.8Mbs. The impact of distance from exchange on the ADLS2+ speed. Whilst attenuation is normally directly linked to the length of your line, there are a few other important factors to bear in mind as to why the above calculator can only be used as a guide. Broadband speed is important. ADSL and distance from exchange I am being told by Telstra that I can receive ADSL at my premises although I am 8km from the local exchange. Due to the fact that your Telephone Line does not run in a straight line from the Exchange, the Distance from Exchange figures, are interpreted as if your Telephone Line is that exact length. Time can be entered or solved for in units of secondes (s), minutes (min), hours (hr), or hours and minutes and seconds (hh:mm:ss). The average distance from the exchange is 8.81km, the furthest is 12.2km. Calculator Use. ADSL Costs. ADSL and ADSL2+ are delivered to your home over copper wires, and because of this, the speed of your connection to the network is impacted by the distance the information needs to travel between the exchange and your home. There is no way the cable layers I've known, could lay a cable in a straight line after lunch. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. 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