Well that didn't go so well!
Just over a day at a seemingly steady 6Mb, then last night the modem started loosing sync every few moments, after an hour of this I switched off the modem for a couple of hours, and now I get line quality below. At one time when the modem linked last night it showed 'upstream noise safety coefficient -52db' !
Now I'm wondering if this is the same problem that started just before I went FTTC (constant dropping of sync), or will my line just not hold a fast line speed. I should note, BT estimate 7 to 11Mb, as do TalkTalk (same data source?) also a map Andrew linked me to showed 7Mb, but the last OR engineer (local chap used to live just down the road, very much his patch), says to expect 4Mb.
There is one small niggle in my mind, we have 100ft of very old (30+ years) copper runs from mk3 socket to a junction box on end of house before linking to new copper back to the pole, I'm fairly sure on both OR visits remaking contacts in junction box made a differance.

Line Quality

Upstream line rate (kbit/s):
901
Downstream line rate (kbit/s):
3319
Upstream noise safety coefficient (dB):
7.2
Downstream noise safety coefficient (dB):
9.1
Upstream interleave depth:
1
Downstream interleave depth:
1
Line standard:
VDSL2
Upstream line attenuation (dB):
15.9
Downstream line attenuation (dB):
32.6
Upstream output power (dBm):
0.4
Downstream output power (dBm):
9.4
Channel type:
Fast
DSL up-time:

Unless there is ingress of damp or wires are moved connections if made well should last for decades

This 100 ft of wiring is it twisted pair?

If the source of noise causing the drops was in the segment of wiring between modem and cabinet and was an issue for ADSL2+ then likely to remain an issue for FTTC.

Generally if the wiring is loose you also get some oddities in the attenuation side (but not always).

The estimating of speeds once you are down into the 7 to 11 Mbps region is pretty difficult and it is very much a try it and see scenario.

The interleaving to handle errors does not look particularly heavy at this time, and if getting lots of errors I'd expect interleaving to have kicked in, raising latency overall but reducing number of errors.

Shifting the master socket to a point closer to the junction box would cut out some distance (every metre matters for you) and might help avoid some noise. In short site modem as close as possible to entry point to house.

A slight correction to my earlier post, the distance from my house to Cabinet along route of line is 1.2miles, don't know if OR engineer guessed 3km of copper.
The mk3 socket is connected within a couple of inches of where the wire enters house and modem pluged straight into that, the old wire exiits throu window frame up to eaves and along to end of house where it joins new wire at junction box.

Okay so does the 100ft extension work if you take the master socket apart to reveal the test socket i.e. just like at http://www.coolwebhome.co.uk/faceplate/

If a phone still works in the extension when the master is down to just the test socket working, then this extension is a bridge tap and can cause problems for VDSL2.

Just to be clear, this isn't an extension leading from the master socket. It's the original copper from 30+ years ago coming into the house that is still used between the master socket and a junction box on end of house. As it's a flat cable I guess it's not twisted pair.
Anyway this morning modem must have reconected, it's sync'ing close on 6Mb with interleaving on downstream, but actual download speeds are very poor and erratic on the speed test jumping from 0 to 3Mb.

Line Quality

Upstream line rate (kbit/s):
881
Downstream line rate (kbit/s):
5985
Upstream noise safety coefficient (dB):
6
Downstream noise safety coefficient (dB):
8.6
Upstream interleave depth:
1
Downstream interleave depth:
5
Line standard:
VDSL2
Upstream line attenuation (dB):
15.9
Downstream line attenuation (dB):
32.8
Upstream output power (dBm):
0.4
Downstream output power (dBm):
10.1
Channel type:
Interleaved
DSL up-time:
0 days 4 hours 18 minutes 21 seconds

I thought I would update this thread.
I wonder if I might have the worse FTTC speeds in UK?
I would advise anyone who has a long line to cabinet to stay well clear of FTTC.


Upstream line rate (kbit/s):
973
Downstream line rate (kbit/s):
2695
Upstream noise safety coefficient (dB):
6.7
Downstream noise safety coefficient (dB):
11.2
Upstream interleave depth:
1
Downstream interleave depth:
471
Line standard:
VDSL2
Upstream line attenuation (dB):
15.8
Downstream line attenuation (dB):
32.8
Upstream output power (dBm):
0.4
Downstream output power (dBm):
10.4
Channel type:
Interleaved
DSL up-time:
2 days 2 hours 44 minutes 57 seconds

In reply to a post by burble:

I thought I would update this thread.
I wonder if I might have the worse FTTC speeds in UK?
I would advise anyone who has a long line to cabinet to stay well clear of FTTC.


Upstream line rate (kbit/s):
973
Downstream line rate (kbit/s):
2695
Upstream noise safety coefficient (dB):
6.7
Downstream noise safety coefficient (dB):
11.2
Upstream interleave depth:
1
Downstream interleave depth:
471
Line standard:
VDSL2
Upstream line attenuation (dB):
15.8
Downstream line attenuation (dB):
32.8
Upstream output power (dBm):
0.4
Downstream output power (dBm):
10.4
Channel type:
Interleaved
DSL up-time:
2 days 2 hours 44 minutes 57 seconds

What speeds did you get on ADSL?

The variation in your noise margin ("Downstream noise safety coefficient") suggests that *something* is happening to your line, and varying considerably.

Do you do anything to log and monitor the stats?

In reply to a post by lee111s:

What speeds did you get on ADSL?

Around 1.3mb, and as I've posted before, whilst jumping from page to page it was actualy faster!

In reply to a post by WWWombat:

The variation in your noise margin ("Downstream noise safety coefficient") suggests that *something* is happening to your line, and varying considerably.

Do you do anything to log and monitor the stats?

I must admit to not noticing that, will add it to the topics when phoning TT next.
All I do is run speed tests now and again, and check router.
i'm still suspicious of the 100ft of flat cable that runs from the the junction box to the master socket, The house is thatched with semi 'rooms in the roof', this means the top half of house has a wire 'cage' covering it (mobile signal is worse upstairs than down),
Most of the flat cable runs just a few inches from the edge where the wire 'cage' terminates, I wonder if it's picking up interference from this. (yes I'm clutching at straws)