ADSL MAX Speeds
Paul
ADSL connecting at around 2.2.or 2.3 Mbps (per my router) with noise margin
of 6 - 7 db.
However, actual download/upload speeds for data etc. (using various speed
testing sites) are at most approx. 1.38 and 0.38. Is this normal (I read
somewhere that BT knocks back the actual download speed by 0.5Mbps for
technical reasons - rather a cheat if so!) or should I report a fault to the
ISP? It seems odd that more than doubling the download connection speed
results in only approx 40% better data download speed in practice!
--
Paul
Peter Crosland
What is the line attentuation? Have tried rebooting your router every 24
hours for ten days?
Peter Crosland
nospam
>I've recently upgraded to ADSL MAX from a standard 1Mb connection.
>
>ADSL connecting at around 2.2.or 2.3 Mbps (per my router) with noise margin
>of 6 - 7 db.
>
>However, actual download/upload speeds for data etc. (using various speed
>testing sites) are at most approx. 1.38 and 0.38. Is this normal (I read
>somewhere that BT knocks back the actual download speed by 0.5Mbps for
>technical reasons - rather a cheat if so!)
So read some more till you understand
http://www.kitz.co.uk/adsl/maxdsl2.htm
--
Paul
news:45b7564f$0$8726$ed26...@ptn-nntp-reader02.plus.net...
Thanks for reply Peter.
No - I haven't rebooted as you suggest - wasn't advised to! Anyway it's more
than 10 days now!
Attentuation around 60/61.
Further comments appreciated.
Many thanks.
Paul
Ted B
>BT knocks back the actual download speed by 0.5Mbps for
No. Their is overhead on the connection however but not 0.5Mbps worth.
> Attentuation around 60/61.
1.38 seems reasonable at that very high attentuation.
Ted.
Gaz
My stats are:
line attenuation 63db, noise margin 7db, and on that i get 3040kbps, which
gives me about 2500kbps download, consistantly while using newsgroups....
I was on eclipse who LLUed me to whoever they use, it would sycn at about
2000kbps, and i was getting about 38kbps (yes, kbps, equating to about
4.8Kbps).....
Gaz
Paul
news:116964706...@proxy02.news.clara.net...
Many thanks Ted. I'm surprised though that the ADSL connection speed isn't
lower if the attenuation is a problem.
Paul
Gaz
I get 3mb and i am a bit higer
Gaz
nospam
>line attenuation 63db, noise margin 7db, and on that i get 3040kbps, which
>gives me about 2500kbps download, consistantly while using newsgroups....
>I was on eclipse who LLUed me to whoever they use, it would sycn at about
>2000kbps, and i was getting about 38kbps (yes, kbps, equating to about
>4.8Kbps).....
Well that was Eclipse deliberately crippling news servers. Interesting to
know they still do that on LLU lines where they presumably are not paying
BT disgusting amounts of money for the connectivity.
--
Gaz
that wasnt a newsgroup speed, it was their general speed done through a
variety of speed testing. Newsgroup access for text (ie these posts) was
incredibly slow, it would take seconds to download a response.
Gaz
Peter Crosland
>>>
>>> ADSL connecting at around 2.2.or 2.3 Mbps (per my router) with noise
>>> margin of 6 - 7 db.
>>>
>>> However, actual download/upload speeds for data etc. (using various
>>> speed testing sites) are at most approx. 1.38 and 0.38. Is this
>>> normal (I read somewhere that BT knocks back the actual download
>>> speed by 0.5Mbps for technical reasons - rather a cheat if so!) or
>>> should I report a fault to the ISP? It seems odd that more than
>>> doubling the download connection speed results in only approx 40%
>>> better data download speed in practice!
>>
>> What is the line attentuation? Have tried rebooting your router
>> every 24 hours for ten days?
>
> it's more than 10 days now!
>
> Attentuation around 60/61.
A MAX DSL line needs to be trained over a period of ten days or so. You do
this by rebooting every 24 hours. I would expect you to get around 1.5bps or
even a little more.
Peter Crosland
Phil Thompson
>ADSL connecting at around 2.2.or 2.3 Mbps
if its dropping below 2272 you'll get a 1.5M profile for which a speed
test of ~1420 is appropriate.
Phil
Paul
news:kg5fr2pdhen3qkin6...@4ax.com...
Many thanks Phil.
That's probably what's happening then! Still a bit of a cheat knocking off
0.5Mb!!
Regards,
Paul
Peter Crosland
>>
>> if its dropping below 2272 you'll get a 1.5M profile for which a
>> speed test of ~1420 is appropriate.
>>
>> Phil
>
> Many thanks Phil.
>
> That's probably what's happening then! Still a bit of a cheat
> knocking off 0.5Mb!!
AIUI BT use very conservative download speeds to avoid a line being
overhwelmed by data being sent too fast. Unfortunatly they don't do this in
fine steps.
Peter Crosland
pzboyz
> ADSL connecting at around 2.2.or 2.3 Mbps (per my router) with noise margin
> of 6 - 7 db.
>
People on this thead may be interested to read
http://www.sinet.bt.com/386v3p0.pdf
It is a proposal from BT that will provide a capped MaxDSL product that
will remove the 3 day DLM process that affects those on long lines the
most. I am on 55dB attenuation and get between 2.4 and 3.1 Mb line
speed, so always above 2Mb.
This sounds good news until you read the part where the upload speed is
limited to 288kb/s compared to the normal 488kb/s.
So if you like the idea of the capped line speed, but do not like the
idea of the limited upload (think about how long it may take to upload
your digital photo's for printing or just e-mailing them to a friend)
pzboyz
nospam
No you don't. It is a bad thing to do. The only thing that gets determined
over the initial 10 day period is the MSR (Maximum Stable Rate). The MSR is
set to the slowest sync speed the exchange sees during the 10 days.
The FTR (Fault Threshold Rate) is then set to 70% of the MSR. If your line
quality deteriorates in the future BT will not accept there is a fault
until your sync speed has dropped below the FTR.
It is obviously in your interest to have as high an FTR as possible.
Rebooting the modem can never increase your FTR but does risk reducing it.
--
Phil Thompson
>That's probably what's happening then! Still a bit of a cheat knocking off
>0.5Mb!!
it was designed for 2M and above, hence the 0.5M increments. Be
thankful you aren't still left to the mercy of the checker and fixed
speed products :-)
Phil
steveybar
> A MAX DSL line needs to be trained over a period of ten days or so. You do
> this by rebooting every 24 hours.
> Peter Crosland
Could you please identify the source of this rather 'sweeping statement' -
Steve B.
Peter Crosland
It is not a sweeping statement as a quick Google search would have revealed.
Try this link for a start.
http://www.kitz.co.uk/adsl/maxdsl2.htm
Peter Crosland
Ian B
<g6...@yahoo.co.uk> wrote:
>It is not a sweeping statement as a quick Google search would have revealed.
>Try this link for a start.
>
>http://www.kitz.co.uk/adsl/maxdsl2.htm
Alternatively, you might like to have a look at BT Wholesale's "Myths
and Legends" document. Somebody on thinkbroadband posted the
following link to a copy...
http://freespace.virgin.net/adsl.test/doc2.pdf
Section 2.4 mentions the "heartbeat" that the exchange equipment for
each line every day and which renders a user generated resync a bit
pointless.
There's a lot of other useful information in there as well. Perhaps
it will put an end to the ten day craning period myth.
--
Ian
The From address is valid - for the moment
steveybar
This is an incorrect statement (I was being very generous previously when I
said 'sweeping statement')
The link you provided is to a good site for understanding the basics of ADSL
etc - but nowhere does it state that you should reboot your router every 24
hours during the 10 day 'training' period!
Rebooting your router every 24 hours during the 10 day 'training' period
will only cause problems setting the MSR (Maximum Stable Rate) and the
subsequent FTR (Fault Threshold Rate) and should therefore not be done.
Steve B.
Peter Crosland
>> revealed. Try this link for a start.
>>
>> http://www.kitz.co.uk/adsl/maxdsl2.htm
>
> Alternatively, you might like to have a look at BT Wholesale's "Myths
> and Legends" document. Somebody on thinkbroadband posted the
> following link to a copy...
>
> http://freespace.virgin.net/adsl.test/doc2.pdf
>
> Section 2.4 mentions the "heartbeat" that the exchange equipment for
> each line every day and which renders a user generated resync a bit
> pointless.
>
> There's a lot of other useful information in there as well. Perhaps
> it will put an end to the ten day craning period myth.
Interesting reading. Note the following from my ISP's guide to MAX DSL.
"During the first 10 days of Max your phone line will be automatically
measured to establish what speed it can support, and in particular at what
speed the line will remain stable. You will see your sync speeds vary, and
commonly may experience disconnections and some instability of your
connection. During the testing period you should frequently make new
connections to the Internet so these tests can take place. It's a good idea
to power off/on your modem or router when doing this - this will force your
equipment to reconnect."
AIUI the "heartbeat" refered to by BT often does not do what it is intended
to do because the user's modem does not recognise it. In which case powering
off the modem every twenty four hours should have the same effect. In any
case it should do no harm.
Peter Crosland
nospam
>AIUI the "heartbeat" refered to by BT often does not do what it is intended
>to do because the user's modem does not recognise it.
The 'heartbeat' does what it is intended to and has nothing whatsoever to
do with the user's modem.
>In which case powering
>off the modem every twenty four hours should have the same effect. In any
>case it should do no harm.
If you care about your Fault Threshold Rate it can *only* do harm.
--
Phil Thompson
<no-...@yahoooooo.co.uk> wrote:
>Rebooting your router every 24 hours during the 10 day 'training' period
>will only cause problems setting the MSR (Maximum Stable Rate) and the
>subsequent FTR (Fault Threshold Rate) and should therefore not be done.
that's probably as "sweeping" as the statement you were seeking to
correct. The MSR is just the lowest sync speed achieved during the 10
day period it can resync once or one hundred times either way it can
still measure the minimum.
Consider USB modems, for example, they'll be on and off several times
in 10 days.
Phil
nospam
>On Thu, 25 Jan 2007 21:15:53 -0000, "steveybar"
><no-...@yahoooooo.co.uk> wrote:
>
>>Rebooting your router every 24 hours during the 10 day 'training' period
>>will only cause problems setting the MSR (Maximum Stable Rate) and the
>>subsequent FTR (Fault Threshold Rate) and should therefore not be done.
>
>that's probably as "sweeping" as the statement you were seeking to
>correct. The MSR is just the lowest sync speed achieved during the 10
>day period it can resync once or one hundred times either way it can
>still measure the minimum.
If your sync speed is variable then re-syncing 100 times will almost
certainly produce a lower minimum than not re-syncing at all. It can never
increase the minimum.
--