FTTC, line profiles & throughput

Have shiny new FTTC broadband, sync at 39879/10000kbps, BT line profile 38717/10000kbps but seeing about 4.2MBps throughput (smidge under 35Mbps).

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

Now the ISP seem certain of this and they're certainly regarded as one of the more technically competent ISPs but I hadn't come across this elsewhere.

Has anyone else?

That's garbage.

The IP profile would be 35Mbps for that to be the case.

Which ISP?

Doesn't sound right to me, I'm on Infinity and get a throughput of around 37.

http://www.mybroadbandspeed.co.uk/results/88756181.png

Newsgroups run at 4.4-4.6MB/s

As already be said i get more than 35Mb

[IMG]http://www.speedtest.net/result/1246849033.png[/IMG]

That's garbage.

The IP profile would be 35Mbps for that to be the case.

Yes, that's what I thought (both points).

Which ISP?

AAISP.

What is certainly true is that their traffic shaping is limiting the line to 35Mbps - the logs clearly show the sync rate as 39879000 (and the BT speedtest confirms the BT IP profile as 38717) but the next line in the log says "linerate=35000000"

Are you the OP, but had forgotten to sign in at the time?

Are you also saying that AAISP can see the sync speed?

Re speedtest.net results from others, they can't be trusted at the level of accuracy required here. I would only trust the BT speed test.

Are you the OP, but had forgotten to sign in at the time?.

Yes.

Are you also saying that AAISP can see the sync speed?.

Yes, it's in the logs that AAISP make visible in their customer log-in pages.

eg if I look at my sync history I get
6 Apr 09:16:31 39712K adsl35000-b 35000K

Slightly inconsistently elsewhere in the logs what I take to be the sync speed is reported as 39879000. The OR engineer said 39995 on the line tester. The BT speedtester has always reported the IP profile as 38717 so whatever the exact figure it's good enough for the highest IP profile. The 35Mbps "BRAS" rate that AAISP are setting is also clearly in the logs and information presented as well.

Re speedtest.net results from others, they can't be trusted at the level of accuracy required here. I would only trust the BT speed test.

The speedtest itself consistently shows just under 30Mbps but I get sustained throughput of about 4.2MB/s on real world transfers.

"The BT speedtester has always reported the IP profile as 38717"

You have verified it is still saying 38717 on the BT Speedtester?

You have verified it is still saying 38717 on the BT Speedtester?

Several times. Last was last night - am at work now so can't check but only one sync event (on wednesday, when the line was installed) showing on the AAISP sync history. Several PPP restarts though as I've been tweaking the firewall set-up and making sure that it was correctly restored across a reboot or router power cycle and the AAISP log always shows "linerate=39879/10000" for those.

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