many thanks for your post

my default snr is 9db. i hacked it before down to 6db which in fine in the day but get to about 1 am and the noise margin drops between 1 and 2 db, the the router will disconnect then resync back at 9db with a lower sync. usually below 4000


with out any tinkering my line with hold a 4000 ip profile.

"we need to look at why it doesn't then connect at more like 7Mbps, which is what is indicated by the 40dB attenuation. "

i have told my ISP about this, but there response is your acceptable range is from 2.5mb to 6.5mb , so they will not do anything

maybe i just have a poor line, i have been told that some lines still use aluminium for a certain part of it, and this can cause lower speeds? ?

when i check the speed ion my street from here
http://www.uswitch.com/broadband/speedtest/

people are getting between 1mb and 4mb

i have an engineer booked for tueday, do you think i should cancels this

any other advice would be most welcome

I'm told by someone who should know that aluminium in the circuit would raise the attenuation. It should therefore be irrelevant to the sync you get, given the attenuation.

The uswitch comparison is worthless, as people don't normally try to optimise their speed. The ring wire can account for a loss of over 2Mbps!

I don't remember why you have an engineer coming, so can't advise sorry.

Let us see the bit loading graphs. That's what we need . What have you been using to tweak?

hi there again , many thanks for your help

mine does not have a ring wire

i can not get to DMT v8.07 to work

I HAVE run it made sure Select "Annex A" was selected

changed the ip address to 192.168.0.1 , on port 23
login is admin
password is password

press connect says connection established send login/username and password please wait

then says error can not identity modem type.DMT version 8.07 for BCM6338/6348/6358 (ADSLCTL)

Did you tick the special login box?

Thank you that worked , do i just take a screen shot of what ia m looking at and upload it ? how do i upload to this site, many thanks

here is the screen shot

http://postimage.org/image/wswr4csk3/

to tweak i was using telnet , info taken from here

http://www.kitz.co.uk/routers/dg834GT_targetsnr.htm

If you compare that with mine, look at the weaknesses on yours above 900 kHz. That's where the speed is being lost.

Let's hope others will chip in with ideas as to the cause at those frequencies. Out of my area of competence .

Lots of useful info on the screen for you . Also, in the info2 and info3 tabs it has the adsctl --stats command in the dropdown lists, so dead easy.

i see what you mean is that some kind of frequency range that is coming down my line.

the reason for then engineer was when i had slow speeds the other day, when we had really bad weather, my isp did a line test i told me there was 897 error on the line.

as my line now appears to be working at the sped at always has, would it be best to cancel the appointment, as i would not want to be charged if no fault is found?

I suggest you ask the ISP what an 897 error is, and is it still there. Or did they mean some error count was at 897, if so, which? My guess would be Error Seconds or Serious Error Seconds if that was it.

Looking at your first set of stats they are both bad for the uptime. You new set has zero SES and moderate ES for the uptime.

I would be very scared of an engineer finding no fault, so charging. Get the ISP to recheck the line.