I live within the Dudley Castle Exchange where 95% of people get fast internet except our new estate where, due to the distance from the exchange, we are limited to 3.2mbps max speed on ADSL2+
I have used a HH5 but the connection keeps dropping and the internet is irratic at best. I have not changed to a Billion 8800 which is much more stable and has dropped the SNR on the line by 2dB but our line profile is being kept low and needs a reset i think. i have been able to get just under 3Mbps in the past but the last few weeks with the HH5 we have been at 0.5 to 1.5.
I have optimised the house internal wiring (bell wire emoved and all extension wires removed) and the modem is in the main socket. ADSL Nation microfilters are used on the main socket.
The line is stable and here are the stats, any suggestions or can we change the profile???
|Link Power State||L0|
|Line Coding (Trellis)||On||On|
|SNR Margin (dB)||4.9||7.9|
|Output Power (dBm)||0.0||12.8|
|Attainable Rate (Kbps)||3204||680|
|K (number of bytes in DMT frame)||0||0|
|R (number of check bytes in RS code word)||0||0|
|S (RS code word size in DMT frame)||0||0|
|D (interleaver depth)||64||2|
|INP (DMT symbol)||4.50||0.50|
|Super Frame Errors||9||93|
|RS Correctable Errors||27101205||1103|
|RS Uncorrectable Errors||299||0|
As you are on adsl2 your profile should be 88.2% of connection speed. To get a better profile you need a faster speed not the other way round
run btspeedtester and when first test completes then run diagnostic test and post results.
Thank you for the quick reply! Test results below. What i dont understand is that i have regularly had 3Mbps in the past. I have lost 50% of my speed.
1. Best Effort Test: -provides background information.
|0 Mbps||2 Mbps|
Max Achievable Speed
| Download speedachieved during the test was - 1.97 Mbps|
For your connection, the acceptable range of speeds is 0.8 Mbps-2 Mbps.
IP Profile for your line is - 2 Mbps
2. Upstream Test: -provides background information.
|0 Mbps||0.83 Mbps|
Max Achievable Speed
|Upload speed achieved during the test was - 0.24Mbps|
Upstream Rate IP profile on your line is - 0.83 Mbps
the btspeedtester results are consistent with your 2272kbps connection speed - profile at 2mb which as I said should be 88.2% of connection speed and download speed just under profile
try using the test socket instead of master socket and see if that increases your speed
check line by doing quiet line test dial 17070 option 2 should be quiet and best with corded phone
Isn't 2272kbps the upper limit of one of the 21CN ADSL2+ line profile bands?
If the line profile has been put on that band due to issues then the connection speed, and hence down IP profile, will not increase until the band is changed.
Thank you. I Will try the mastersocket direct but as there is no internal wiring at all i can't see it making any difference. regarding the noise on the line i can hear some noise with a DECT phone but need to find an old wired one to try.
"If the line profile has been put on that band due to issues then the connection speed, and hence down IP profile, will not increase until the band is changed."
This is my point but i am no expert - i did my comms enginnering 30 years ago!
While i am chieveing near to the current line profile i know the line is capable of higher speeds. it's not much but 3Mbps is still 50% better than 2Mbps and thats what i am trying to get back to.
I'm no expert either, but if your line profile is on the 1152 - 2272kbps restricted band then I think in theory the DLM will eventually change it back to your previous band automatically if any line issue has gone away. In some circumstances the DLM seems reluctant to do this (a stuck profile) and BT have to manually give the system a nudge.
The question of course is whether any line issue is still present. So yes trying the test socket is certainly a good move.
It may be a banded profile but you would normally expect noise margin to be 15db+ and not 4.9db - but I have seen it lower than 15db and banded
see what you get when test socket if speed still 2272kbps then banding is possible