In reply to a post by billford:

In reply to a post by timl:

DLM on FTTC punishes good lines that are ok apart from a bit of occasional noise or crosstalk.

We need an option to have it turned off.

Not really. An option to reset it after a one-off exceptionally noisy episode might be useful though.

On ADSLx the ISPs have the ability to reset DLM to initial connection defaults, in other words re-run the 10-day "training" period. First-line and even second-line seem generally unaware of this.

But this particular case is FTTC and a different DLM where they cannot.

Edited by RobertoS (Thu 29-Aug-13 08:56:25)

In reply to a post by RobertoS:

But this particular case is FTTC and a different DLM where they cannot.

But that's the fault of BTO, not the DLM...

Edited by billford (Thu 29-Aug-13 09:01:53)

I've just done an edit Bill. This isn't applicable to FTTC. I forgot the forum.

In reply to a post by RobertoS:

I've just done an edit Bill.

Thanks, so have I

I can, of course, only speak about my experience. Crosstalk is surely and slowly killing my FTTC connection. DLM doesn't seem to handle this well at all.

So if I can't have DLM off can I have vectoring

In reply to a post by timl:

So if I can't have DLM off can I have vectoring

Probably yes... but don't hold your breath

In reply to a post by timl:

In my opinion DLM is used by BT mostly to avoid having to fix minor faults with their old copper lines which ultimately saves them money.

Which ultimately saves us money and/or ensures they have enough funds to continue investing in the network

like it fixed (not) robertos current fault? and reacted too late to stop my short term intterment fault (which occured only for 2 hours or so) and even then my fault sitll affected my connection.

DLM in my view is been used to cover up issues with lines, can see also with ignition's recent posts plusnet's reply is to suggest a bump in snrm.

I have seen some posts on the internet where people have lost extreme amounts of sync speed to stability settings, around 50% or more due to very high FEC configured by DLM, I assume in such a situation BT still see it as acceptable as long as the user doesnt complain or the loss of speed occured in a short time period.

I can understand why DLM is there, ultimately it saves BT a ton of cash on fixing local loop issues and reduced calls to tech support. As it does successfully hide various faults albeit after delay (doesnt react right away). But thats all it does it hides.

Where it seems more better is hiding crosstalk errors. A more potent source of errors is too much for DLM to deal with.

For me I would like to see 2 things.

DLM polls the line every hour not every 24 hours, so if something happens, the user doesnt wait until 5am the next morning for DLM to "do something about it" but instead it reacts faster.

When DLM makes a change thats stability related an alert is sent out to engineers when a engineer is auto booked to fix the fault causing DLM, in other words DLM is used as a temporary workaround whilst the fault is been fixed and never used as a long term fix.

Edited by Chrysalis (Thu 29-Aug-13 19:55:38)

In reply to a post by billford:

In reply to a post by timl:

DLM on FTTC punishes good lines that are ok apart from a bit of occasional noise or crosstalk.

If it's occasional then in my experience the DLM ignores it.

We need an option to have it turned off.

Not really. An option to reset it after a one-off exceptionally noisy episode might be useful though.

what happens if you get a burst of noise for 2 hours say once every weeks?

The user of their own free will can choose to disable DLM, have fast path and good line for most of the week and then just put up with the issue for those 2 hours.

Or instead DLM keeps the line perm interleaved as the issue is regular enough to prevent recovery.

In reply to a post by Chrysalis:

then just put up with the issue for those 2 hours.

A speed hungry fibre user tolerating, without complaint, a noisy line for two hours every week?

You jest.