In reply to a post by NBK:

107528 was the original FTTC lines sync speed

The maximum sync speed is 80 Mbps, or 79,999 Kbps in your case.

it depends how much the 40-50 metres the lines are together affect it which I have no idea about...I know other lines in that 20 pair cable up the pole are connected to FTTC so I can only assume it's from the pole that the interference is...but I don't know

I should have said max possible according to the modem

He has already been "playing" with it - turning off te new and rechecking te old.

"Sync" is the Bearer 0 line, not the Max line. Similarly you should have an actual connection speed on the Home Hub I expect.

Please stop messing with the new line until Sunday, and preferably the old one as well, seeing as they are interacting.

2.2.1 Dynamic Line Management
Dynamic Line Management (DLM) is employed in GEA-FTTC. DLM constantly manages lines to maintain a target link quality (speed and stability). It does this for as long as the product exists.
At provision, the line is put on �wide open� VDSL2 line profiles allowing the upstream and downstream line speeds to run at the upper limit of the product option selected.
On the first day of operation, DLM will intervene if severe instability is detected. Otherwise, DLM will wait until the day after provision before deciding if it must intervene, provided that the line has been trained up for at least 15 minutes during the preceding day.
If DLM intervenes it will set a profile with a maximum rate and a minimum rate, where the minimum rate is set at approximately half of the maximum rate.

That's from Openreach SIN 498.

By intervening it means put banding on the line, which takes months to be removed. It doesn't mean the normal adjustments of interleaving and the like.

You may be in danger of triggering interleaving as it is, with what you have done so far. That costs typically 10Mbps and adds 8ms to latency. Again, taking weeks to go away.

I know - just told him not to . At least for now.

In reply to a post by RobertoS:

You may be in danger of triggering interleaving as it is, with what you have done so far. That costs typically 10Mbps and adds 8ms to latency. Again, taking weeks to go away.

He may be happy if that happens because it will increase the max attainable

Sorry boss

You're probably fine with what you've done so far. But you needed to know . After the second day a few tests and so on as MHC has suggested aren't likely to do any harm.

Unlike the ADSLx DLM, this one normally makes all its changes some time after midnight.

yes 40m of crosstalk can cause that.