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[Bald_Eagle1]

They are all here, part way down the page:-

http://www.tellyads.com/vintage_sub_index.php?alpha=B

[Chrysalis]

Black sheep, sorry I only just found this thread.

I actually thought you told me you never see big crosstalk before (apologies if you never said that)

I was one of those saying I think crosstalk is a big problem at least for some lines.

so if you want my opinion is 15meg crosstalk realistic on a line that synced at 80mbit? absolutely.

My line I have estimated roughly 40mbit lost to crosstalk down from 110 to just under 70. Plus 9mbit lost on the upstream from 36mbit to 27mbit.

[Chrysalis]

For some of us, who have an obsessive curiosity, it would be interesting to know just how low your connection's DS Interleaving depth is as mentioned here:-
<snip>

yeah Whilst your issue probably is crosstalk, I agree with you entirely that really BT should be doing full physical checks before diagnosing crosstalk.   But its probably cheaper to do a pair quality test, if it says ok and then just decide its crosstalk at that point.

[ryant704]

It's updated and changed (again)!

                                   High   Low   High   Low      
FTTC Range A (Clean)           28.7   20   6.7   4.9   --   Available
FTTC Range B (Impacted)   23.1   11.2   5.9   2.9   --   Available

Clean is higher than my original estimate!

[Puppy]

Same here!  Whats going on, anyone know?

[ryant704]

It's for self-installs (rumored) which will be going live early next year!

I also just wondered what estimate the ISP will give you out of them!

BT
20Mbps* Download speed (Clean, Low)
4.9Mbps* Upload speed (Clean, Low)

Sky
20.3Mbps Download speed (Clean, Low?)
N/A Upload Speed

TalkTalk
20Mbps Download speed (Clean, Low)
4Mbps Upload speed

Mixed results!

[The black Mamba]

Hi. Customers
On the provision of a new instalition from the Cab D side a high and low insulation test should be taken to the Master Socket. ( speed point )
This consistes of A and B lines to Earth plus loop resistance in ohms these results should be given to the customer in their contract with there ISP.
This test will not pick up slip pairs on an unbalanced cable but these will be corrected by the special faults group in my day.
All overhearing faults if were difficult or vague were passed to SFG.
Regards.  Phil

[ryant704]

Hi. Customers
On the provision of a new instalition from the Cab D side a high and low insulation test should be taken to the Master Socket. ( speed point )
This consistes of A and B lines to Earth plus loop resistance in ohms these results should be given to the customer in their contract with there ISP.
This test will not pick up slip pairs on an unbalanced cable but these will be corrected by the special faults group in my day.
All overhearing faults if were difficult or vague were passed to SFG.
Regards.  Phil

Source of this?

I also believe this to be nothing new...

[les-70]

   I might be more convinced by this checker but I used the numbers of 3 neighbors.    I would guess a range of distances of 220m to 350m to the CAB.  Each of them nearer the cab and find the same totally identical result to my own!!

[ryant704]

   I might be more convinced by this checker but I used the numbers of 3 neighbors.    I would guess a range of distances of 220m to 350m to the CAB.  Each of them nearer the cab and find the same totally identical result to my own!!

Estimates are up to the DP, I assume all three of you are fed via the same DP.

[renluop]

Here's what they now estimate for my number. Seeing that the old style estimates were 26.2 Mb/s and I am syncing on ADSL2+ ~7.5-8Mb/s, not that attractive. I'm 650 -850 metres from the cab.

I just do not get it how suddenly a good line is thought to achieve a 161% increase, or a bad line a 32% decrease of the old style estimates.

Is it old renluop being stupid?

[Bald_Eagle1]

Is it old renluop being stupid?

I think it's more like BT's estimates can't be relied upon.

e.g. I have just tried a telephone No. that is roughly 300m closer to the same cab than my home (surely a different DP?), yet the FTTC estimated speeds are identical.

FWIW, this is what my connection currently achieves (despite Plusnet tests very recently givving it a clean bill of health regarding bridge taps/crosstalk/RFI/REIN etc:-
Bearer:   0, Upstream rate = 4877 Kbps, Downstream rate = 20695 Kbps


Test Outcome    Pass
Test Outcome Code   GTC_FTTC_SERVICE_0001
Description   GEA service test completed and no fault found but unable to check for customer equipment connected to modem.
Main Fault Location   OK
Sync Status    In Sync
Downstream Speed    20.7 Mbps
Upstream Speed    4.9 Mbps
Appointment Required    N
Fault Target Fix Time   
Fault Report Advised    N
NTE Power Status    PowerOn
Voice Line Test Result    Pass
Bridge Tap    Not Detected
Radio Frequency Ingress    Not Detected
Repetitive Electrical Impulse Noise    Not Detected
Cross Talk    Not Detected
Profile Name    11.2M-22.4M Downstream, Interleaving Low - 2.5M-5M Upstream, Interleaving Off
Time Stamp    NA


So, my connection must now be FTTC Range B (Impacted???) as I used to achieve around 30Mbps/7Mbps

[les-70]

   I might be more convinced by this checker but I used the numbers of 3 neighbors.    I would guess a range of distances of 220m to 350m to the CAB.  Each of them nearer the cab and find the same totally identical result to my own!!

   They probably are all from a common box in the ground, two then go underground and the other two (including mine) come via a pole standing near the box in the ground.  In fact a walk along the road and judging cable runs carefully narrows the range of distances to about 280-340m so it may be luck or approximate estimates.

[The black Mamba]

Hi
If your line has no faults to the Master Socket (dside drop wire lead in) the results should be the same on all ISPs tests.
If it is different they have place you on a different class of service. QOS even different service routing after their provision.
Please remember the distance is to the DP on Pair 1 from the Cab only and the line resistance result,this should be checked on provision of the DP block.
Regards.  Phil

[renluop]

Surprising how fiercely an impacted line appears to affect performance.


There are my daughter's property and one down her road nearer ti the cabinet by 77 metres, both estimated 80 Mb/s, Clean and dirty.

Daughter's low estimates are 9.9% (clean) and 26.25% (impacted) below the full rate, whilst the other property has 2.375% and 16% reductions over full rate. That's 8 Mb/s in 77 metres for a dirty line.