Speed restriction?
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Speed restriction?
18-05-2008 12:27 PM
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I have run BT's speed test and get the following results:
IP profile for your line is - 6500 kbps
DSL connection rate: 448 kbps(UP-STREAM) 8128 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 2717 kbps
2717 kbps matches the range of speeds I'm seeing with the other speed tests. I'm hoping that the value will increase beyond 6500 kbps if the sync. rates remain stable.
Looking at the IP profile rate on the PlusNet page I (still) see:
Your current broadband speed is 3000 Kbps
Is it possible that PlusNet have clamped my connection to 3000 Kbps? If so, can someone reset it please?
TIA
Edit: Here are some stats from my utility for completeness:
Router Stats Logger v1.0.23 report - 18 May 2008 12:07:30As one can see, the SNR and attenuation levels are OK.
DS rate: 8128 kbit/s
US rate: 448 kbit/s
Max DS rate: 8128 kbit/s
Max US rate: n/a
DS SNR: 9 dB
US SNR: 28 dB
DS Attn: 21 dB
US Attn: 9 dB
DS Power: 19 dB
US Power: 12 dB
Re: Speed restriction?
18-05-2008 2:25 PM
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Your BT profile has indeed been lifted, not sure why we didn't pick up the change here. I've manually adjusted this now so if you powercycle the router you should get a better speed.
Sorry for the hassle there, hope that helps.
Re: Speed restriction?
18-05-2008 2:55 PM
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It now reads: Your current broadband speed is 6500 Kbps
I power-cycled my router and the speed has improved a little (see the attached image) as it has gone over 3000 kbps for the first time since moving the router (reaching 3429 kbps). However, it's still lower than one would expect isn't it?
I'll do some more tests, but it is possible there is some other throttling or restriction going on?
Re: Speed restriction?
18-05-2008 3:16 PM
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I'd suggest having a search through these forums (maybe also http://www.kitz.co.uk) and looking for MTR tweaks as that may well help... unfortunately it's not something I can advise on myself as I've not tried it as yet (currently on cable).
Hope that helps,
Re: Speed restriction?
18-05-2008 5:21 PM
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The above will not resolve the problem of contention at that test server. Therefore it may be better to try a download from a UK mirror site and see what throughput you can achieve then. You could also try this link.
Hope this helps.
Re: Speed restriction?
18-05-2008 7:53 PM
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Scroll down to where it says dslreports have a tweaktester, and try that. Its possible you are not correctly set up for faster speeds, XPs defaults are nowhere near where you need them to be. ( I am assuming you are running XP, vista does it all differently). Kitz has some explanations on vista MTU etc
Re: Speed restriction?
18-05-2008 7:57 PM
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Re: Speed restriction?
19-05-2008 12:43 AM
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I have tested many MTU and RWIN settings today and continued to perform speed tests on multiple websites. I'm now getting around 5500 kbps which is more reasonable but I have found that the RWIN and MTU don't make a huge difference (the speed varies more between different times of the day which can be down to contention etc as already mentioned).
Past experience has shown that MTU values can be more significant to people if certain websites become unavailable, but that doesn't apply in my case
Re: Speed restriction?
19-05-2008 8:42 AM
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I found the biggest factor in tuning my connection to be the RWIN figure, which practically doubled my connection speed. I'm on an 8128k BBYW Pro and I think I can (at absolute MAX!) get around 6700 Kbps download on a 7150 profile
B.
Re: Speed restriction?
31-05-2008 4:06 PM
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As expected with my improved connection characteristics, my (BT) IP Profile has increased:
IP profile for your line is - 7150 kbps
DSL connection rate: 448 kbps(UP-STREAM) 8128 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 4135 kbps
My PlusNet profile still says:
Your current broadband speed is 7000 Kbps
So could someone give my PN profile a nudge again (to 7150 Kbps), please?
I know 150 Kbps isn't a big deal, but still, every little helps
[quote=Barry Zubel]I'm on an 8128k BBYW Pro and I think I can (at absolute MAX!) get around 6700 Kbps download on a 7150 profile
I'm disappointed to discover that despite syncing at the maximum 8128 kbps and maintaining a decent SNR margin etc that it's still not possible to achieve the maximum "8 MB" throughput. So all the "up to 8MB" advertising that people are complaining about should actually be "up to about 7MB" anyway
Re: Speed restriction?
31-05-2008 4:26 PM
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The BT systems show your profile as being 7000kbps since the 23rd May so there wouldn't be anything gained from upping your profile at this end.
Sorry for the hassle,
Re: Speed restriction?
31-05-2008 11:41 PM
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Quote from: Neo I'm disappointed to discover that despite syncing at the maximum 8128 kbps and maintaining a decent SNR margin etc that it's still not possible to achieve the maximum "8 MB" throughput. So all the "up to 8MB" advertising that people are complaining about should actually be "up to about 7MB" anyway
Sorry, your interpretation of the numbers is incorrect.
8128kbps is the datagram (bit-rate) you get. Subtract approximately 10% for ATM transmission overheads and another 3% for TCP/IP overheads and you get 8128 x 0.9 x 0.97 = 7096kbps idealised throughput rate. BTW call this the IP Profile and make it 7150kbps. The actual throughput is less than that due to the effects of data integrity management.
So the throughput really is 8128kbps, it's just that not all of it can be user data.
Re: Speed restriction?
01-06-2008 4:31 PM
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Quote from: Neo Update:
As expected with my improved connection characteristics, my (BT) IP Profile has increased:
IP profile for your line is - 7150 kbps
DSL connection rate: 448 kbps(UP-STREAM) 8128 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 4135 kbps
A BT IP Profile of 7150 is the highest that you could attain under ADSLMax. The throughput is clearly lower that what you should be seeing and this probably indicates contention at the BT exchange and, or contention at the BT Speetest server and, or high internet traffic. What throughput speeds do you get when you run a test really early in the morning - say at 06:30? If it's not 6000+ kbps then your computer tcp/ip settings or perhaps your router MTU, would need some tweaking no doubt.
Re: Speed restriction?
07-06-2008 11:51 AM
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Thanks for the reply, but I have been using the BT Speedtester frequently since then and it repeatedly reports:
Quote from: orbrey The BT systems show your profile as being 7000kbps since the 23rd May so there wouldn't be anything gained from upping your profile at this end.
IP profile for your line is - 7150 kbpsbut the PN profile is still stuck on 7000 kbps.
DSL connection rate: 448 kbps(UP-STREAM) 8128 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 4458 kbps
Thanks, I'm aware of the overheads involved, but my point is that the "up to 8MB" marketing spiel is still wrong because the maximum real data transfer speed that anyone will see will always be below 8000 kbps...
Quote from: spraxyt Sorry, your interpretation of the numbers is incorrect.
8128kbps is the datagram (bit-rate) you get. Subtract approximately 10% for ATM transmission overheads and another 3% for TCP/IP overheads and you get 8128 x 0.9 x 0.97 = 7096kbps idealised throughput rate. BTW call this the IP Profile and make it 7150kbps. The actual throughput is less than that due to the effects of data integrity management.
So the throughput really is 8128kbps, it's just that not all of it can be user data.
Yep, I know
Quote from: MickKi A BT IP Profile of 7150 is the highest that you could attain under ADSLMax.
I get around the 6050 kbps mark (6500 kbps on Speedtest.net), so I think my MTU values don't need any further tweaking.
Quote from: MickKi What throughput speeds do you get when you run a test really early in the morning - say at 06:30?
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