On 20/08/2016 19:05, The Natural Philosopher wrote:
On 20/08/16 18:40, Tim Streater wrote:
Once we were online again, *the two extra punch connections reduced the
speed to about 4.5Mbps*, where it stayed until we got FTTC.

You have absolutely *NO* evidence to support that.

I got from 4.5 to 6Mbps at the cost of coffee and doughnuts because an
engineer selected the quietest pair of lines on the trunk.

Crosstalk from other ADSL users is enough to knock that much S/N off any
pair.

Your speed didn't reduce because of connections, your speed reduced
because in the new cable all the ADSL subscribers were adjacent.





Bloody hell TNP got something near correct.

All the pairs have different twist rates to reduce crosstalk but having
DSL on two with similar twist rates can cause more crosstalk than
another pair with a big difference in twist rates.