Attenuation

got one of the speedtouch 330 modems. no snr information, but there is
the attenuation:

ReceiveAttenuation_dB= 24
ReceiveMargin_dB= 6
SendAttenuation_dB= 10
SendMargin_dB= 25

Don't know if that's good or bad???

I take it it wouldn't be possible to calculate the SNR?

Bored now. :-) anyone want a speedtouch 330?

Cheers
Simon

Simon Dean wrote:
> got one of the speedtouch 330 modems. no snr information, but there is
> the attenuation:
>
> ReceiveAttenuation_dB= 24
> ReceiveMargin_dB= 6
> SendAttenuation_dB= 10
> SendMargin_dB= 25
>
> Don't know if that's good or bad???
>
> I take it it wouldn't be possible to calculate the SNR?

Try here.

http://212.23.23.177/calc.htm

Peter Crosland

Peter Crosland wrote:
> Simon Dean wrote:

>>ReceiveAttenuation_dB= 24
>>ReceiveMargin_dB= 6
>>SendAttenuation_dB= 10
>>SendMargin_dB= 25
>>
>>Don't know if that's good or bad???
>>
>>I take it it wouldn't be possible to calculate the SNR?
>
>
> Try here.
>
> http://212.23.23.177/calc.htm
>
> Peter Crosland
>
>

It requires the SNR. I don't have the SNR.

Thanks
Simon

Simon Dean wrote:
> Peter Crosland wrote:
>> Simon Dean wrote:
>
>>> ReceiveAttenuation_dB= 24
>>> ReceiveMargin_dB= 6
>>> SendAttenuation_dB= 10
>>> SendMargin_dB= 25
>>>
>>> Don't know if that's good or bad???
>>>
>>> I take it it wouldn't be possible to calculate the SNR?
>>
>>
>> Try here.
>>
>> http://212.23.23.177/calc.htm
>>
>> Peter Crosland
>>
>>
>
> It requires the SNR. I don't have the SNR.

You do! Signal To Noise Ratio AKA as margin.

Peter Crosland

In message <(E-Mail Removed)>, Simon Dean
<(E-Mail Removed)> writes
>Peter Crosland wrote:
>> Simon Dean wrote:
>
>>>ReceiveAttenuation_dB= 24
>>>ReceiveMargin_dB= 6
>>>SendAttenuation_dB= 10
>>>SendMargin_dB= 25
>>>
>>>Don't know if that's good or bad???
>>>
>>>I take it it wouldn't be possible to calculate the SNR?
>> Try here.
>> http://212.23.23.177/calc.htm
>> Peter Crosland
>
>It requires the SNR. I don't have the SNR.
>
>Thanks
>Simon
Yes you do, its the receive margin in the above stats 6dB
--
Peter R Cook

Simon Dean wrote:
> got one of the speedtouch 330 modems. no snr information, but there is
> the attenuation:
>
> ReceiveAttenuation_dB= 24
> ReceiveMargin_dB= 6 <--------- SNR margin downstream
> SendAttenuation_dB= 10
> SendMargin_dB= 25
>
> Don't know if that's good or bad???

nor does anybody else without knowing the speed :-)

it ought to be 8128 at that attenuation.

Phil

PhilT wrote:
> Simon Dean wrote:
>
>>got one of the speedtouch 330 modems. no snr information, but there is
>>the attenuation:
>>
>>ReceiveAttenuation_dB= 24
>>ReceiveMargin_dB= 6 <--------- SNR margin downstream
>>SendAttenuation_dB= 10
>>SendMargin_dB= 25
>>
>>Don't know if that's good or bad???
>
>
> nor does anybody else without knowing the speed :-)
>
> it ought to be 8128 at that attenuation.
>

You learn something everyday. Thanks for everyones help on the SNR.

Yes, you're right. My line speed is 8128 kbps.

So, are these good figures? I've never known whatthey were before...

Cheers
Simon

Simon Dean wrote:

> You learn something everyday. Thanks for everyones help on the SNR.
> Yes, you're right. My line speed is 8128 kbps.
>
> So, are these good figures? I've never known whatthey were before...

you won't go any faster because you're at the top speed for BT's MaxDSL
and you only have 6 dB of margin. You may find it gets a bit unstable
at times if the SNR drops away.

You might be able to improve the SNR a bit - see if you get the same
result in the test socket behind the master faceplate.

Phil

Error correction rates should be a good measure of performance.

It is about time such statistical measurements were made available.
It is related to signal-to-noise ratio and reliability of transmission
and reception..

Reg Edwards wrote:
> Error correction rates should be a good measure of performance.
>
> It is about time such statistical measurements were made available.
> It is related to signal-to-noise ratio and reliability of transmission
> and reception..

several modems will run BER tests, and most clock up stats on errors
and corrected errors.

Phil