Confused: why has my speed dropped on ADSL2+

[#1]

latest speed test

[#2]

Damn It! I just saw you put 1430...Grrr will do it again

[#3]

Sorry about that... must be the painkillers lol .......now put the router @ 1430 heres the tweek test
http://www.dslreports.com/tweakr/block:14a0d7e?service=dsl&speed=4000&os=winXP&via=pppoA

[#4]

The tweak tests show similar results with all three values of MTU. Could you post your current router stats (just the sync speeds, SNR margins and attenuations)? Changing MTU and RWIN shouldn't have affected sync speed, only changes in target SNR margin (if any) will change that.
David

[#5]

morning David
up speed 929100.....down 39421000
SNR 10.0
atten 33.0

[#6]

Your sync speed remains way below what it should be for an attenuation of 33dB and the current SNR margin is not high enough to explain that. So a line fault remains the favourite explanation (and as I mentioned earlier this was probably present before moving to the 21CN trial).
Since you mentioned receiving an email from Plusnet requesting you to carry out a tweak test I assume you have a speed fault ticket open. In which case I suggest adding the current results (comment, router stats image, and tweak test URL) to it and returning it to the CSC.
David

[#7]

David, yes I have a speed fault  ticket  open and replied to that with the current results, as advised, also just done another tweak test which advised to set the MTU to 1500,
is it OK to go back and reset that ? as I dont want to do anything while you guys are handling things, I'm not the expert lol
http://www.dslreports.com/tweakr/block:585361e?service=dsl&speed=4000&os=winXP&via=normal
Barry

[#8]

Please disregard that tweak test! I had the mode set to normal  not ppoA

[#9]

Your present settings are those Plusnet asked you to try so I suggest keeping them until the problem is picked up again after the holiday.
The latest tweak test shows slightly different Round Trip Time behaviour from previous ones, though otherwise it is much the same as before. (Whether you set mode to "normal" or "PPPoA" affects only the MTU recommendations, not the test results.)
David

[#10]

thanks david here is the reply from the ticket I raised

Quote

Dear Mr Shaw, As per our discussion today. I have spoke with BT and there is no banded profile on your line and essentially what you are receiving in terms of speeds on your line, is what your line can handle. Please monitor your connection and should you have further problems, please let us know. Kind regards, Keith *******

Rgds Barry
Moderator's Note by David (spraxyt): Agent's full name removed as per Forum Rules.

[#11]

Hi Barry,
What Keith is saying there is that your line speed isn't being capped by a "banded profile".
I'd like to see if your noise margin can drop a little more automatically.  Has it always been at 10dB or have you noticed much in the way of fluctuations?

[#12]

hi James been away from PC last 2 days, I have changed over to the router supplied by plusnet, heres the latest stats Link Information
Uptime: 0 days, 0:16:57
DSL Type: G.992.3 annex A
Bandwidth (Up/Down) [kbps/kbps]: 1,042 / 3,898
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 26.5 / 46.5
SN Margin (Up/Down) [dB]: 6.5 / 9.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 4,294,967,264 / 6
CRC Errors (Up/Down): 4,294,967,264 / 0
HEC Errors (Up/Down): 0 / 0
Rgds Barry

[#13]

I only briefly read this thread, but keep in mind on the 2800 that parameter is MSS not MTU
http://www.draytek.co.uk/support/kb_vigor_mtu.html
Also on the maintenance menu it has he abiity to show a bits per bin graph which is often illuminating.

[#14]

Thanks Lorian will check that out
Rgds barry

[#15]

Interesting ..having switched back to the Vigor 2800  router, and following the instructions lorian posted
the reading is now
Upload  833600
Down    4962800
SNR    6.5
Att      35.5