So perhaps the question should be, why does the IP profile on AA systems not match that on the BT system?

Indeed.

In fact I have asked them this very thing and obtained the response that I posted at the start of this thread "BT do not allow more than 35Mb through the line on FTTC so this is why it's 35Mb max."

In reply to a post by mr_bean:

"BT do not allow more than 35Mb through the line on FTTC so this is why it's 35Mb max."

Hmm.

35.3 is possibly a bit close to the margin of error to really "prove" the point to AAISP but thanks for the datum.

What I could do with is a few people with clear BT speedtest results in the 37-38Mbps range to provide as evidence.

Edit: think I might pop over to the AAISP forum to see what other people's experience is.

Edited by mr_bean (Mon 11-Apr-11 18:18:52)

Fair point, but don't forget the "Mbps" on the result should really be "Mibps", ie it's 2²⁰ not 10⁶.

If you click on it you'll see the Kbps speed, which is how it's usually quoted- 36155.38 Kbps

In reply to a post by mr_bean:

What I could do with is a few people with clear BT speedtest results in the 37-38Mbps range to provide as evidence.

I can't run another BT speedtest for an hour but I'll post again once I've done it.

For now though here's some various results you can use and/or show to AAISP.

Speedtest.net - http://speedtest.net/result/1246708155.png

Mybroadband speedtest - http://www.mybroadbandspeed.co.uk/results/88968111.png

Thinkbroadband Flash - http://img.photobucket.com/albums/v427/griff_90/b4c6...

Edited by griff_90 (Mon 11-Apr-11 19:47:57)

I can't run another BT speedtest for an hour but I'll post again once I've done it.

Thanks

Interestingly this came up in a discussion in 2009. It doesn't look as though anybody got to the bottom of it back then either.

Good point, as Openreach work in powers of 10 for FTTC....

"These rates use 40,000,000 bits/s as 40Mbit/s, and are the VDSL line rates"

The SIN sayeth.....

"In general, Openreach suggests that CPs should set the EU traffic rate to allow for part of the VDSL rate to be used for internal FTTC use depending on the CP frame size. At 1532 byte frame size 40Mbit/s VDSL will support 39.282Mbit/s Ethernet
throughput."

Not sure if we then need to multiply that by 1460/1500 to correct for TCP/IP headers giving a data throughput of 38.23 Mbits/s. Still doesn't get us down to 35 !

If AAISP are mistakenly limiting it, as may be the case from that 2009 link, (which contains incorrect info about the overheads by the way, see yarwells post here), then they will all be the maximum.

10/03/11 17:57 Thu 35363 Kbps 8316 Kbps
05/03/11 23:17 Sat 35939 Kbps 8313 Kbps
05/03/11 23:15 Sat 36477 Kbps 8299 Kbps
04/03/11 15:56 Fri 35263 Kbps 8306 Kbps

http://speedtest.net/result/1249661845.png

Have a look at the other test results that I have run as nearly all are in the 37's for downstream side of things.

Recent results from My Broadband Speed test site:

Date Download Speed Upload Speed
Today 06:47 37448 kbps (4.68MB/s) 8367 kbps (1.05MB/s)
Yesterday 06:45 37601 kbps (4.7MB/s) 8343 kbps (1.04MB/s)
Monday 06:40 37485 kbps (4.69MB/s) 8208 kbps (1.03MB/s)
Sunday 08:07 37475 kbps (4.68MB/s) 8363 kbps (1.05MB/s)
Saturday 07:22 37462 kbps (4.68MB/s) 8377 kbps (1.05MB/s)
Friday 06:28 37462 kbps (4.68MB/s) 8374 kbps (1.05MB/s)
Apr 7, 07:36 37477 kbps (4.68MB/s) 7921 kbps (990kB/s)
Apr 7, 07:36 37366 kbps (4.67MB/s) 8338 kbps (1.04MB/s)
Apr 6, 06:51 37483 kbps (4.69MB/s) 8359 kbps (1.04MB/s)
Apr 5, 20:49 37120 kbps (4.64MB/s) 8340 kbps (1.04MB/s)
Apr 5, 07:46 37464 kbps (4.68MB/s) 8363 kbps (1.05MB/s)
Apr 4, 06:45 37471 kbps (4.68MB/s) 8335 kbps (1.04MB/s)
Apr 3, 23:43 37449 kbps (4.68MB/s) 8340 kbps (1.04MB/s)
Apr 3, 09:39 37491 kbps (4.69MB/s) 8368 kbps (1.05MB/s)
Apr 3, 09:37 37461 kbps (4.68MB/s) 7836 kbps (980kB/s)
Apr 2, 08:01 37489 kbps (4.69MB/s) 8373 kbps (1.05MB/s)
Apr 1, 21:04 37497 kbps (4.69MB/s) 8362 kbps (1.05MB/s)
Apr 1, 06:54 37469 kbps (4.68MB/s) 8311 kbps (1.04MB/s)
Mar 31, 06:46 37484 kbps (4.69MB/s) 8356 kbps (1.04MB/s)
Mar 30, 20:27 37447 kbps (4.68MB/s) 8331 kbps (1.04MB/s)
Mar 30, 16:00 37460 kbps (4.68MB/s) 8365 kbps (1.05MB/s)
Mar 30, 06:50 37458 kbps (4.68MB/s) 8364 kbps (1.05MB/s)
Mar 30, 06:43 37155 kbps (4.64MB/s) 8329 kbps (1.04MB/s)
Mar 30, 00:01 35916 kbps (4.49MB/s) 8365 kbps (1.05MB/s)
Mar 30, 00:00 30098 kbps (3.76MB/s) 8357 kbps (1.04MB/s)
Mar 29, 17:10 37391 kbps (4.67MB/s) 8363 kbps (1.05MB/s)
Mar 27, 23:09 37299 kbps (4.66MB/s) 8350 kbps (1.04MB/s)
Mar 27, 08:11 37478 kbps (4.68MB/s) 8344 kbps (1.04MB/s)
Mar 26, 19:06 37458 kbps (4.68MB/s) 8374 kbps (1.05MB/s)
Mar 26, 07:55 37469 kbps (4.68MB/s) 8358 kbps (1.04MB/s)