RE: Broadband ADSL Help

["Marcus Warrington" <marcus.warrington@xxxxxxxxxx>]

The synched speed is NOT an indication of how fast your downloads will
be, only an indication of the potential upperlimit of your connection.
The actual download speed will be dependant on other factors such as
contention (how many other ISP users are sharing the same bandwidth ..
usually this is a 50:1 ratio) , the speed of the server your connecting
to, how many hops (how many machines inbetween you and the server) etc..



The other thing I'd say is that if the laptop is using wireless then
that will also limit your actual download speed. .. more than you might
think. My laptops 54g wireless connection probably only manages a
sustained  1-2meg at most.



Marcus

________________________________

From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
Of Mark Golledge
Sent: 05 February 2008 18:07
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Broadband ADSL Help



Thanks for all the emails.

Have emailed ISP so we'll see what becomes of that (if anything).

Sorry if I didn't make myself clear.

The Netgear router is displaying (in admin settings) downstream
connection
speed of 3968kbp/s and upstream of 448kbp/s.

However, when on my laptop I go to www.speedtest.net, the connection
speed
comes out at 1914kbp/s and upstream of 373kbp/s.

Not much joy today on line attenuation and noise margin which is 53db
and
4db respectively.

Any further thoughts much appreciated,

Mark

On Feb 5, 2008 9:33 AM, Marcus Warrington <marcus.warrington@xxxxxxx
<mailto:marcus.warrington%40mis-es.com>
>
wrote:

> I assume when you say "download speeds" you actually mean
the line
synch
> speed.
>
> My understanding of all this smoke and mirrors is that you router will
> try and synch the line to obtain a Signal To Noise Ratio (SNR) of
6.5db
> i.e. it can hear 6.5db of signal above the background noise etc. As
the
> line synch speed increases the SNR will decrease and as the line synch
> speed decreases the SNR will increase. Therefore the speed you get
> depends on how good your line is (i.e. how much SNR you have). This is
> all subject to the maximum speed of your ADSL connection, that may
also
> be limited by the exchange DSLAM.
>
> BT also add more confusion to the mix by limiting the maximum
connection
> speed based on how reliably you have connected in the past.. they have
> some acronym for it ..BRAS (?) ..may be worth asking your ISP to have
> this reset.
>
> The fact that the two routers are showing different results is either
> because the Netgear has a much better chipset and can see more SNR
than
> the other one or the line SNR is varying widely and when you
reconnected
> it was much better so got a better connection.
>
> I'm on Be Unlimited using a Netgear834GT and see that my SNR drops
from
> 6.5db during daylight hours to about 3 - 2.5db at night.. I think this
> is quite common for SNR to drop at night and may be to do with more
> electrical activity (street lights etc) near the telephone line? I
> always synch at a better speed if I reconnect during the day (higher
SNR
> available) than if I resynch at night (lower SNR available).
>
> Marcus
>
> ________________________________
>
>
> From: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<ukha_d%40yahoogroups.com> [mailto:
> ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<ukha_d%40yahoogroups.com>] On Behalf
> Of Mark Golledge
> Sent: 04 February 2008 21:54
> To: ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
<ukha_d%40yahoogroups.com>
> Subject: Re: [ukha_d] Broadband ADSL Help
>
> Ok,
>
> I've done some checks. According to speedtest, I'm getting download
> speeds
> of 1946kb/s and upload speeds of 367kb/s. I know that I've previously
> been
> achieving download speeds of 3000kb/s so something is not right there.
>
> Both those speeds are what is being achieved on the laptop (and
desktop
> PC).
>
> However, just gone into Netgear settings and downstream connection
speed
> is
> showing 3488kb/s and upstream 448kb/s.
>
> Any ideas?
>
> Line attenuation is showing 53db downstream and 15.5db upstream and
snr
> is
> showing 3bd downstream and 19db upstream. Line attentuation seems kind
> of
> high and snr low (should be the other way around I think).
>
> Mark
>
> On Feb 4, 2008 9:40 PM, Andy Davies <dajdavies@xxxxxxx
<mailto:dajdavies%40gmail.com>
<dajdavies%40gmail.com>
> <mailto:dajdavies%40gmail.com>
> wrote:
>
> > We had problems with our 3Com router and Vodafone, worked fine
when
we
> > first moved in and then it would start to be unable to keep an IP
> > address, changed to a Netgear router and everything was fine.
> >
> > I seem to remember seeing something in the Register that there's
a
> > 'known issue' with some routers and the BT DSLAMs which only
comes
to
> > light when the DSLAMs are updated.
> >
> > Andy
> >
> >
> > On Feb 4, 2008 7:40 PM, Mark Golledge <markgolledge@xxxxxxx
<mailto:markgolledge%40googlemail.com>
<markgolledge%40googlemail.com>
> <mailto:markgolledge%40googlemail.com>
<markgolledge%40googlemail.com>>
>
> > wrote:
> > > Hi everyone,
> > >
> > > I've been having some problems with my broadband recently.
About 6
> > months
> > > ago we moved across to Vodafone at Home from BT for
broadband and
> home
> > > phone.
> > >
> > > Al has been fine except over the last few months I've come
across
> more
> > and
> > > more times where my internet connection seems to be dropping
> > occasionally.
> > >
> > > Happened for quite a bit on Saturday to such an extent that
I
> couldn't
> > get
> > > on the internet at all.
> > >
> > > Am using a Router (Netgear DG834G) connected via microfilter
to
the
> > phone
> > > line.
> > >
> > > No problems with wireless at all, that stays fine. It is the
ADSL
> light
> > on
> > > the router which keeps dropping and then re-connecting.
> > >
> > > Have checked with Vodafone and they said it was the wireless
but
> advised
> > > them it can't be because the wireles is still connected. No
> recognisable
> > > problem with phone line.
> > >
> > > Any ideas?
> > >
> > > --
> > >
> > > Mark Golledge
> > > E: mark@xxxxxxx <mailto:mark%40markgolledge.com>
<mark%40markgolledge.com> <mailto:
> mark%40markgolledge.com>
> <mark%40markgolledge.com>
> > > W: www.markgolledge.com
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> > > **** Sponsored By http://www.Berble.com <http://www.Berble.com>
<http://www.Berble.com <http://www.Berble.com>
>
> ****
> > > **** Computers You Carry ****
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
>
> --
>
> Mark Golledge
> E: mark@xxxxxxx <mailto:mark%40markgolledge.com>
<mark%40markgolledge.com> <mailto:
> mark%40markgolledge.com>
> W: www.markgolledge.com
>
> [Non-text portions of this message have been removed]
>
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>
>
>

--

Mark Golledge
E: mark@xxxxxxx <mailto:mark%40markgolledge.com>
W: www.markgolledge.com

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