On the other hand I'm also 450 meters from the cabinet, but only sync at 42, best I've ever had for any length of time is 47.

In the end it comes down to the quality, length of line and how much crosstalk you suffer.

Thanks guys, for all your helpful comments. They do though, prompt me to ask how the TBB table of estimated speeds has been compiled, and do they ever get revised in the light of practical experiences? Perhaps Mr Saffron could comment if he gets chance?

Thanks

Keep in mind that you do not "upgrade from copper (or aluminium) to FTTC"; and that the state of the final metres of copper/aluminium from the PCP to your house become very much more critical, because of the higher frequencies involved.

And that final distance will in fact be increased by the new copper links from the PCP to the new FTTC cabinet.

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In my case, the FTTC cabinet is about 15 metres from the NTE in my house; but about 50 metres from the PCP, which because of a peculiarity of the local wiring, takes about 250 metres to get to my house, compared to about 65 metres if the 1967 phone line had been laid in sensibly.

Even that 50 M FTTC to PCP distance has been increased by about 10 metres, as the links first go away from the PCP by about 5 M then virtually doubles-back to head to the PCP.

There was plenty of space beside the PCP and existing electricity supplies etc, so no obvious reasons for the excessive lengths of either run, ancient or modern!

On Thursday this week, when my FTTC connection goes in (all being well), 15 metres direct or 2x50 M + 15 M will actually be about 300 metres - with a decided chance of a degraded service.

"The best-laid schemes o' mice an' men
Gang aft agley,"

Have commented many times in the past and while pessimistic they are not worst case crosstalk scenario.