'Impacted' only seems to show on FTTC lines and it is assumed that this is for lines which may suffer from small line faults such as a bridge tap, or possibly cross talk. If you are attaining speeds in this range, BT don't consider it as a line fault. As of 2014 more lines seem to be showing the effects of crosstalk as more users are added to the FTTC cabinet. Although BT started using the term 'impacted' in 2013, it wasn't until cross-talk actually reached the stage of possibly impacting on my connection speed (rather than max headline) that the 'impact' figures appeared in my results. 15Mbps seems to be a fair average for most lines. Over a 6 month period I have lost 20Mbps from my own max headline speed due to cross talk.
This is how I attempted to explain it on the main site a while agoQuote'Impacted' only seems to show on FTTC lines and it is assumed that this is for lines which may suffer from small line faults such as a bridge tap, or possibly cross talk. If you are attaining speeds in this range, BT don't consider it as a line fault. As of 2014 more lines seem to be showing the effects of crosstalk as more users are added to the FTTC cabinet. Although BT started using the term 'impacted' in 2013, it wasn't until cross-talk actually reached the stage of possibly impacting on my connection speed (rather than max headline) that the 'impact' figures appeared in my results. 15Mbps seems to be a fair average for most lines. Over a 6 month period I have lost 20Mbps from my own max headline speed due to cross talk.
