Question about ADSL line attenuation and SNR
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Posted by Jake on April 4, 2007, 5:25 am
Please log in for more thread options de.comm.technik.dsl comp.dcom.xdsl uk.telecom.broadband Hello, I have uploaded some screenshots of the results I got after I ran some diagnostics on my 4096/512 ADSL line. I suspect that too much noise on the line causes re-transmissions which in return lowers my effective downstream speed for TCP traffic. I have measured a downstream speed of approx 2mbit and it is supposed to be around 3.7mbit. Could you please tell me if I am right? In my router I see that the line attenuation (downstream) is above 60dB and the SNR is sometimes as low as 3dB. My ISP keeps on saying that they measure 4096/512 on my line, but my diagnostic tools says otherwise. I look forward to receiving some comments. Thank you. Screenshots are here: 3 tests: http://img337.imageshack.us/img337/2808/diag1rf1.jpg TraceRoute and TPTest results: http://img453.imageshack.us/img453/5967/diag2km2.jpg | ||||||||||||||||
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Posted by Eeyore on April 4, 2007, 6:50 am
Please log in for more thread options Jake wrote: No they don't ! Graham | ||||||||||||||||
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Posted by Jake on April 4, 2007, 7:09 am
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> No they don't !
> > Graham Could you elaborate please? The TPTEST showed that downstream TCP speed is approx 2.5mbit. What about the attenuation (The DSL central is less than 2km from here)? I think an attenuation of 64dB is quite high when the distance is so short. And the SNR in the receive direction is sometimes at 3dB....isn't that quite low? | ||||||||||||||||
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Posted by Ralph A. Schmid, dk5ras on April 4, 2007, 8:11 am
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>What about the attenuation (The DSL central is less than 2km from here)? I
>think an attenuation of 64dB is quite high when the distance is so short. Yes, it is high, when the 2km are correct. Is your installation OK, twisted pair cables, no "flat" ones in your wiring? | ||||||||||||||||
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Posted by Jake on April 4, 2007, 8:19 am
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>
> Yes, it is high, when the 2km are correct. Is your installation OK, > twisted pair cables, no "flat" ones in your wiring? How do I check to see if it's "twisted pair cables" ? And what do you mean by "flat" ? Thank you. | ||||||||||||||||
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> comp.dcom.xdsl
> uk.telecom.broadband
>
> Hello,
>
> I have uploaded some screenshots of the results I got after I
> ran some diagnostics on my 4096/512 ADSL line.
>
> I suspect that too much noise on the line causes re-transmissions
> which in return lowers my effective downstream speed for TCP
> traffic. I have measured a downstream speed of approx 2mbit
> and it is supposed to be around 3.7mbit.
>
> Could you please tell me if I am right?
>
> In my router I see that the line attenuation (downstream) is
> above 60dB and the SNR is sometimes as low as 3dB.
>
> My ISP keeps on saying that they measure 4096/512 on my line,
> but my diagnostic tools says otherwise.