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SNR Margins and Line Attenuation

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SNR Margins and Line Attenuation

Hi

I am having massive disconnect problems, and i was wondering what are the ideal SNR Margins and Line Attenuation values. My SNR values are 37 down and 30 up and my Line Attenuations are 38.9 down and 21 up.

Cheers
Aaron
8 REPLIES
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

RE: SNR Margins and Line Attenuation

> Hi
>
> I am having massive disconnect problems, and i was wondering what are the ideal SNR Margins and Line Attenuation values. My SNR values are 37 down and 30 up and my Line Attenuations are 38.9 down and 21 up.
>
> Cheers
> Aaron

Aeron
The results below are of the figures shown by my server.
As you can see the Signal to noise ratio is 1db higher than yours and the attenuation is much the same downstream and far worse upstream.
I am having no problems (touch wood) so your line looks Ok.

SNR
SNR 38 dB

ATEN
ATEN Downstream 29 dB
ATEN Upstream 31 dB

--
Regards
John
http://www.hmrg.co.uk
Community Veteran
Posts: 6,983
Thanks: 8
Registered: 10-04-2007

RE: SNR Margins and Line Attenuation

> > Hi
> >
> > I am having massive disconnect problems, and i was wondering what are the ideal SNR Margins and Line Attenuation values. My SNR values are 37 down and 30 up and my Line Attenuations are 38.9 down and 21 up.
> >
> > Cheers
> > Aaron
>
> Aeron
> The results below are of the figures shown by my server.
> As you can see the Signal to noise ratio is 1db higher than yours and the attenuation is much the same downstream and far worse upstream.
> I am having no problems (touch wood) so your line looks Ok.
>
> SNR
> SNR 38 dB
>
> ATEN
> ATEN Downstream 29 dB
> ATEN Upstream 31 dB
>
>
> --
> Regards
> John
> http://www.hmrg.co.uk

Mmmm Just looked more carefully. your downstream attn is a bit high?
--
Regards
John
http://www.hmrg.co.uk
N/A

RE: SNR Margins and Line Attenuation

Aaarent and John.

Geeez at what speeds are you guys roaming T1!!!

I only have 576 kb/s down and 288 kb/s up with SNR 18.5, Aten 32 DB down and 16 DB up. It stands to reason to have the Aten up half of the other in relation to the bandwidths connection.

Also I do not have the facility on my router to adjust these values. My ADSL router is model D-Link DSL-504.

Can you adjust those valuesHuh

Regards

Tim
--
lhaig
Dabbler
Posts: 21
Registered: 30-07-2007

RE: SNR Margins and Line Attenuation

Tim
I have the same router.

I am having connection problems where my line goes down quite often.

How is your connection?

My figures are

SNR 20.5 db down and nothing up
aten 1db down and 3 db up

my operation mode is G.DMT

I have no Idea if these figures are bad or good?

Lance

> Aaarent and John.
>
> Geeez at what speeds are you guys roaming T1!!!
>
> I only have 576 kb/s down and 288 kb/s up with SNR 18.5, Aten 32 DB down and 16 DB up. It stands to reason to have the Aten up half of the other in relation to the bandwidths connection.
>
> Also I do not have the facility on my router to adjust these values. My ADSL router is model D-Link DSL-504.
>
> Can you adjust those valuesHuh
>
> Regards
>
> Tim
>
> --
>

N/A

RE: SNR Margins and Line Attenuation

> Tim
> I have the same router.
>
> I am having connection problems where my line goes down quite often.
>
> How is your connection?
>
> My figures are
>
> SNR 20.5 db down and nothing up
> aten 1db down and 3 db up
>
> my operation mode is G.DMT
>
> I have no Idea if these figures are bad or good?
>
> Lance
>
> > Aaarent and John.
> >
> > Geeez at what speeds are you guys roaming T1!!!
> >
> > I only have 576 kb/s down and 288 kb/s up with SNR 18.5, Aten 32 DB down and 16 DB up. It stands to reason to have the Aten up half of the other in relation to the bandwidths connection.
> >
> > Also I do not have the facility on my router to adjust these values. My ADSL router is model D-Link DSL-504.
> >
> > Can you adjust those valuesHuh
> >
> > Regards
> >
> > Tim
> >
> > --
> >
>
>
Lance,

Mmmmm how interesting!
Firstly check your length of RJ11(Phone line) to your DSL router. They reckon no longer than 30 metres from the wall as it could also weeken the signal. Another option if you have loads of connections like SKY and other low baudrate connections like the old faithfull primus stove(56 dial-up) on standby, do yourself a fouvour and complain about your line. The BT engineer will give you a call and perhaps increase the lines volume to compensate. Before I went ADSL, my old PCI modem was a little slow so it did make differance.
The BT engineer was supportive with my Internet surfing and did me a favour.
Happy as Larry!

My SNR is less than yours at 18.5 and also nothing up so that's normal. Perhaps your volume of your line is higher than mine with all your connections dropping your ADSL volume signals. Check your ADSL link speeds as well as firmware and come back to me.

Cheers Boet!
lhaig
Dabbler
Posts: 21
Registered: 30-07-2007

RE: SNR Margins and Line Attenuation

Tim,

Firstly,

>Cheers Boet!
South African?


Secondly.

I read another post of yours and checked my Firmwareversion.

I upgraded to the 18uk version and then reconfigured my router for NO NAT

Ran a diagnose and had a failure on
Data Transmission Test

I will check my rj11 length and see but if I remember correctly it as 10 meters and I cut off quite a bit.

nothing else on the line. just ADSL and phone

Who do I complain to about the line quality? BT or +net?

Link speeds are

576 kbps 288 kbps


Thanks for the help.

Lance
N/A

RE: SNR Margins and Line Attenuation

> Tim,
>
> Firstly,
>
> >Cheers Boet!
> South African?
>
>
> Secondly.
>
> I read another post of yours and checked my Firmwareversion.
>
> I upgraded to the 18uk version and then reconfigured my router for NO NAT
>
> Ran a diagnose and had a failure on
> Data Transmission Test
>
> I will check my rj11 length and see but if I remember correctly it as 10 meters and I cut off quite a bit.
>
> nothing else on the line. just ADSL and phone
>
> Who do I complain to about the line quality? BT or +net?
>
> Link speeds are
>
> 576 kbps 288 kbps
>
>
> Thanks for the help.
>
> Lance

Yaaa swaar! Howzit!

Correctamundo. My link speeds are also the same although I'm using NAT enabled as it's a good firewall protection to prevent anyone having the same IP address as your own on the network.
Unless...You opted for a Static IP address from PLUSNET as you are using more than one computer.
How many PC'c are you running and is your setup client/server or peer to peer?
Also had a failure on the data transmission test so we're not alone.
Goodstuff on the firmware and all up to date my broer.

Cheers

PS: Call BT and let us know I think try 150. Who's +net? Don't you have a BT line?

lhaig
Dabbler
Posts: 21
Registered: 30-07-2007

RE: SNR Margins and Line Attenuation


> Yaaa swaar! Howzit!

Nie Bad nie!!!!


>PLUSNET as you are using more than one computer.

I have 3 servers and two workstations on Fixed IP's

I have a firewall that I will install once the line is stable. I can't offer my services from here if the line is carpy.

> PS: Call BT and let us know I think try 150. Who's +net?

+Net ( PlusNet)?

Don't you have a BT line?

Yip I sure do I will give them a ring.

Cheers

Lance