Acceptable range of speeds for this line.

Question

Dear Forum,
I have for many months now been on the phone to Bt with regards to the fact that when I run the speedtester the results for the acceptable range of speeds for this line dose not match up to BT's own table within their broadband speed wizard.  Below please find the latest speedtester result and the table taken from said area.
Test1 comprises of Best Effort Test:  -provides background information.
 Download  Speed
 1825 Kbps
0 Kbps 2000 Kbps
Max Achievable Speed
 Download speedachieved during the test was - 1825 Kbps
 For your connection, the acceptable range of speeds is 400-2000 Kbps.
 Additional Information:
 Your DSL Connection Rate :2528 Kbps(DOWN-STREAM), 448 Kbps(UP-STREAM)
 IP Profile for your line is - 2000 Kbps
Write down your test results and use the table below to check that your throughput speed is in the right range for your connection speed.
Connection rate downstream test result:     Throughput speed you should expect:               
288Kbps                                                             50Kbps to 250Kbps
288Kbps to 576Kbps                                            50Kbps to 500Kbps
576Kbps to 1152Kbps                                         200Kbps to 1000Kbps
1152Kbps to 2272Kbps                                       400Kbps to 2000Kbps
2272Kbps to 8128Kbps                                       600Kbps to 7150Kbps
I keep getting told that they can't change the acceptable range of speeds for this line to read 600Kbps to 7150Kbps as this was originally set when I first took broadband from BT, but surely they can rerun the test's that set up this configuration so that the acceptable range of speeds for this line reads as above.
I used to, prior to a length of main cable being replaced back in May of this year, between the exchange and the street box, get a DSL of between 2648Kbps and 3020Kbps.  When the cable was replaced, they replaced 9Guage with 5Guage.  Also it has been found out by two engineer's that about 325Mtrs from my property that there is a sudden drop of 1000Kbps.  Both BT and Openreach seem to think that this is acceptable.  I don't and niether do my neiboughers, who are also affected.
Please get back to me with a reasonable answer to this.  Not like when I dealt with Mods in the past and they would only answer one part of the problem.
 Thanks in advance.

Answer 1

The bit loading is not great on that liine ....
And it's little to do with the metallic path specification you referred to in another post.
One thing is certain, Openreach operate to strict codes of practice, and don't just install any old wire .... 
The noise margin is not bad, target is 6db ... but the problem there is that you have a high forward error count
which demonstrates a profound level of interleave, which does cause some latency.
It's the bitloading that's causing the high error count.
Sometimes a RF3 filter, fitted by Openreach can cure some of this ... sometimes not.
But the CRC, cyclic redundancy checks, are re-transmitted packets, and therefore do absorb bandwidth.
Also the errored second count is high, these are seconds which have seen bad error rates.
I don't think you'd benefit by going into the test socket either, as most errors are downstream and margin is
fair, the CRC up errors are false, a result of poor scripting in the hub firmware.
You could try buying quality line filters, or using a v1 splitter socket face, but to be honest, your line is your line,
and that's why the broadband is line adaptive ... to cater for all quality levels of lines.
Yours is not the best I've seen.
You could try a reset at midday, often gaining a higher sync rate, as much as 400-500kbps.
No more than 3 resets in 24 hours, DLM will downgrade the IP.
Glad to have helped you ... perhaps not what you wanted to hear though.