FTTC Range A and B?

[#1]

Hi all,
Just checked on http://www.dslchecker.bt.com/ and it seems things are a bit different!
Im seeing FTTC Range A and FTTC Range B reading:
FTTC Range A (Clean) 80 75.4 20 20 -- Available
FTTC Range B (Impacted) 80 62.6 20 19 -- Available
What does this mean?
If anyone can enlighten me that would be great
Connor

[#2]

I get a little bit of explanation if I go to https://www.btwholesale.com/includes/adsl/main.html instead.
[tt]FTTC Range A (Clean)    33  23.7  7.6  6.1  --  Available
FTTC Range B (Impacted)  26  13.1  7.1  4.1  --  Available[/tt]

Quote

For FTTC Ranges A and B, the term "Clean" relates to a line which is free from any wiring issues (e.g. Bridge Taps) and/or Copper line conditions, and the term "Impacted" relates to a line which may have wiring issues (e.g. Bridge Taps) and/or Copper line conditions.

[#3]

Thanks for that ejs!
Connor