The idea would to use the same FTTC DSLAM.
The service would be availability to any CP that takes the openreach GEA service

I thought as much...

Well its a great idea anyway,

in my area where the cabinet is about 3.7km from the exchange by line length, the entire adsl1 region has almost no vdsl bitloading due to heavy power cutback to protect adsl services.

I agree I cannot be sure if it would be as good on vdsl due to lack of live data.

Since any vdsl modem I have seen is BC with adsl, I assume is the same for vdsl dslams.

Yeah probably LLU is probably a no go with cabinet based adsl services. Although LLU providers can still use their backhaul so still would be cheap backhaul costs for them.

Edited by Chrysalis (Mon 06-Oct-14 18:22:01)

Well its something we will find out as it unveils I suppose.

In reply to a post by Chrysalis:

in my area where the cabinet is about 3.7km from the exchange by line length, the entire adsl1 region has almost no vdsl bitloading due to heavy power cutback to protect adsl services.

What about the ADSL2+ region (1.1-2.2MHz)?

I just checked here, and was quite surprised. The cabinet is around 1.2 - 1.5km from the exchange, depending on the route used.

Judging by my SNR/tone graph, tone 320 gets the minimum power, and full power is restored by tone 375.

That's quite a short distance, so I guess it tells us that the copper between exchange & cabinet is quite thin.

For comparison, my old house was 1km from the exchange, and the minimum power was at tone 480 there.

the start of the adsl2+ region is part of the cutback I think to about tone 300-350. But by that point my signal is no longer able to do full 15 bits per tone, the power cutback is on the lowest tones. On my line its taking at least 15mbit attainable sync off.

Edited by Chrysalis (Tue 07-Oct-14 14:30:36)

In reply to a post by Chrysalis:

On my line its taking at least 15mbit attainable sync off.

I've never tried working that out for my line...

Apart from the cutback, my maximum bit-loading is 13 over a very wide plateau (tone 65 through to 535). The cutback dip is from tone 90 through to 375, and drops down to 4 bits, making (almost) a nice triangle.

I make it that it has lost around 1,300 bits because of power cutback, which I reckon to be worth just over 5Mbps.

As a cross-check, I reckon I can fit 16 triangles of that size over the downstream bit-loading graph, and 1/16th of 80Mbps is indeed 5Mbps.

The shape of my cutback matches the diagram in part B of the ANFP, for the line labelled "CAL=30". That happens to be the middle level of the CAL values.

Most theoretical speed-distance graphs suggest that you'd get around 15Mbps at 2km; I'd guess that ADSL2+ would lose an identical amount of speed if it were sourced from my cab, so the top speed here would be likely to be around 10Mbps.

In reply to a post by Ribble:

The idea would to use the same FTTC DSLAM.
The service would be availability to any CP that takes the openreach GEA service

still rubbish anyway cos BT limit ADSL2+ at 12Meg capped! (not 24Meg)

I will be sure to tell them to abandon the product then and offer no help to those too far to get VDSL

In reply to a post by MrSaffron:

I will be sure to tell them to abandon the product then and offer no help to those too far to get VDSL

No, BT Openreach should have two FTTC's cabinet in halfway between in houses will be no problem at all. Reason is BT doesn't want two cabinets in same area. And a silly to put cabinet long distance away from some houses who unable to get VDSL because too long over 3km away. So, putting two cabinets each 1.5km rather than 3km away will solves it.

Edited by adslmax (Tue 07-Oct-14 19:40:25)