+1
Copper has the same limiting qualities, whether in SA, Germany, UK, USA.......etc. In SA copper lines were always pushed to the longest lengths due to the spread out nature of our cities and communities/communities. In the UK for instance its not very often you get exchange connections longer than 4km......Whereas in SA lines can go very long 5, 6 and sometimes 7km. The longer the copper is, the more it impedes high frequency signals like ADSL.
You remember this graph......it represents the expected results of ADSL over copper with its inherent transmission properties.
http://www.internode.on.net/residential/broadband/adsl/extreme/performance/
My line attenuation is 17.5dB (about 1km from the exchange).........so on ADSL I could expect 22Mb/s !!!! (but Ill take Telkoms offer of 10Mb/s for now)