I have just changed my router for a BT 2wire 2700HGV and notice that unlike
my previous router, it is syncing at a bit lower speed (3486 kbps) as
apposed to my previous common router sync speed of 4128 kbps.  But I also
notice that my router is now holding a downstream noise margin that is
steady at 15.0db all the time.  I would have expected this 15.0db to be
lower and the speed to be slightly higher than it is currently?? Whats the
lowest figure for downstream noise margin that these routers will go down
to?  With my old router I am used to seeing a noise margin of around 5db or
less and a greater sync speed of around 4128 kbps.

Will the router adjust itself if I leave it online permanently?

Thanks

Ken Nixon wrote:
> I have just changed my router for a BT 2wire 2700HGV and notice
> that unlike my previous router, it is syncing at a bit lower speed
> (3486 kbps) as apposed to my previous common router sync speed of
> 4128 kbps.  But I also notice that my router is now holding a
> downstream noise margin that is steady at 15.0db all the time.  I
> would have expected this 15.0db to be lower and the speed to be
> slightly higher than it is currently?? Whats the lowest figure for
> downstream noise margin that these routers will go down to?  With
> my old router I am used to seeing a noise margin of around 5db or
> less and a greater sync speed of around 4128 kbps.
>
> Will the router adjust itself if I leave it online permanently?
>
> Thanks

If you keep swapping routers RAMBO (?) will raise your SNR threshold to 
anything upto 15dB, which is what you are getting.  The problem is that when 
it has done that on occaisions the profile gets sticky so it doesn't 
renegotiate to give you faster speeds by reducing your SNR threshold.  If 
you leave it for a few days you may find that it does change, but whilst you 
are plugging, unplugging/switching on & off your service don't expect much 
to happen at all.

>
> If you keep swapping routers RAMBO (?) will raise your SNR threshold to
> anything upto 15dB, which is what you are getting.  The problem is that
when
> it has done that on occaisions the profile gets sticky so it doesn't
> renegotiate to give you faster speeds by reducing your SNR threshold.  If
> you leave it for a few days you may find that it does change, but whilst
you
> are plugging, unplugging/switching on & off your service don't expect much
> to happen at all.

The old router is a Netgear DG834G, and still happliy syncs at 3776 kbps any
time of day or night.  I bought this BT2700HGV because I was led to believe
it would give me a better connection speed.  But perhaps it is not working
out that way.

Kraftee, thanks for those comments.  Are the above comments you made correct
for both IPStream and Datastream?  My ISP uses Datastream (so I am told).

Ken

On Jun 15, 12:51 am, "Ken Nixon" 
wrote:
> I have just changed my router for a BT 2wire 2700HGV and notice that unlike
> my previous router, it is syncing at a bit lower speed (3486 kbps) as
> apposed to my previous common router sync speed of 4128 kbps.  But I also
> notice that my router is now holding a downstream noise margin that is
> steady at 15.0db all the time.  I would have expected this 15.0db to be
> lower and the speed to be slightly higher than it is currently?? Whats the> lowest figure for downstream noise margin that these routers will go down
> to?  With my old router I am used to seeing a noise margin of around 5db or
> less and a greater sync speed of around 4128 kbps.
>
> Will the router adjust itself if I leave it online permanently?
>
> Thanks

My current stats on a 2700HGV. Lowest noise margin has been about 4.
Toying with getting te ISP to set it to 3 at some point just to see
how it handles

DSL  Down  Up
Current Rate:  17183 kbs   1108 kbs
Max Rate:  17749 kbs   1108 kbs
Current Connection:
 Current Noise Margin:  5.7 dB   7.5 dB
 Current Attenuation:  21.8 dB   10.1 dB
 Current Output Power:  16.6 dBm   12.0 dBm

I can't help a lot here, but I bought one of these routers for a friend 
living miles from the exchange.

Previously we tried a DG834G and a Linksys job. Neither would stay 
connected reliably for any length of time.

The 2700 however is utterly superb. Hasn't missed a beat in a year now.



Ken Nixon wrote:
> I have just changed my router for a BT 2wire 2700HGnd notice that unlike
> my previous router, it is syncing at a bit lower speed (3486 kbps) as
> apposed to my previous common router sync speed of 4128 kbps.  But I also
> notice that my router is now holding a downstream noise margin that is
> steady at 15.0db all the time.  I would have expected this 15.0db to be
> lower and the speed to be slightly higher than it is currently?? Whats the
> lowest figure for downstream noise margin that these routers will go down
> to?  With my old router I am used to seeing a noise margin of around 5db or
> less and a greater sync speed of around 4128 kbps.
>
> Will the router adjust itself if I leave it online permanently?
>
> Thanks
>
>
>

Kraftee,
I am right that BT has recently made changes to the way DLM operates ?

My BT1801HG is capable of 2.8Mb/s on 6dB SNR and 51dB att. ~95% of the time. 
We get frequent random noise spikes and even though the router works down to 
2dB SNR, it does disconnect quite often, but almost always re connects 
straightaway.
Previously it was possible to bring it back 'up to speed', whenever the SNR 
got over the 6dB treshold.
However, lately it won't, I even got my ISP to reset it back down to 6dB, 
but it has since climbed up to 12dB and they refuse to do it again. They 
said it should be left alone for at least five days, but it just doesn't 
stay up for that long !

Quite simply I am prevented from making the best use of my connection. It's 
MY connection and I should be able to chose between slow and steady or fast 
with drop outs.
If I get a router which can set min of say 8dB would the DLM use that limit, 
or would it set it's own higher one ?
Thanks, regards,
Martin

Steve Olive wrote:
> I can't help a lot here, but I bought one of these routers for a
> friend living miles from the exchange.
>
> Previously we tried a DG834G and a Linksys job. Neither would stay
> connected reliably for any length of time.
>
> The 2700 however is utterly superb. Hasn't missed a beat in a year
> now.
>
>
> Ken Nixon wrote:
>> I have just changed my router for a BT 2wire 2700HGnd notice that
>> unlike my previous router, it is syncing at a bit lower speed (3486
>> kbps) as apposed to my previous common router sync speed of 4128
>> kbps.  But I also notice that my router is now holding a downstream
>> noise margin that is steady at 15.0db all the time.  I would have
>> expected this 15.0db to be lower and the speed to be slightly higher
>> than it is currently?? Whats the lowest figure for downstream noise
>> margin that these routers will go down to?  With my old router I am
>> used to seeing a noise margin of around 5db or less and a greater
>> sync speed of around 4128 kbps. Will the router adjust itself if I leave 
>> it online permanently?
>>
>> Thanks

I bought one of these a few weeks ago from digidave.co.uk and as everyone 
else suggested it has improved my sync speed.  I've got a long line (75db 
attenuation) which was just giving me a 1250 profile with a DG834v3.  The 
2wire is nearly at the 1750 threshold so I'm hopeful that when BT shove in 
the 21CN kit in August that I might finally breach 2Mb.

-- 

WCZ

Martin² wrote:
> Kraftee,
> I am right that BT has recently made changes to the way DLM operates ?
>
> My BT1801HG is capable of 2.8Mb/s on 6dB SNR and 51dB att. ~95% of
> the time. We get frequent random noise spikes and even though the
> router works down to 2dB SNR, it does disconnect quite often, but
> almost always re connects straightaway.
> Previously it was possible to bring it back 'up to speed', whenever
> the SNR got over the 6dB treshold.
> However, lately it won't, I even got my ISP to reset it back down to
> 6dB, but it has since climbed up to 12dB and they refuse to do it
> again. They said it should be left alone for at least five days, but
> it just doesn't stay up for that long !
>
> Quite simply I am prevented from making the best use of my
> connection. It's MY connection and I should be able to chose between
> slow and steady or fast with drop outs.
> If I get a router which can set min of say 8dB would the DLM use that
> limit, or would it set it's own higher one ?
> Thanks, regards,
> Martin

If you want to play with the SNR then the Netgear DG834GT is the way to go. 
Some of the speedtouch models can also be tweaked with the DLM tool but you 
need the right router model and the right firmware.  The DG834GT as far as I 
know still works with DLM with the latest firmware.  Or you could put the 
UberGT firmware on it.  Not sure how close you'll get to 6dB but it will be 
an improvement for you.

When your exchange goes to 21CN for broadband BT will be supporting a user 
chooseable SNR.  You can choose from 6dB upwards.

-- 

WCZ