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Author Topic: Fastest ever downstream performance  (Read 2627 times)

Chrysalis

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Re: Fastest ever downstream performance
« Reply #45 on: February 02, 2017, 09:32:42 PM »

Weaver at least its temporary on adsl :) on vdsl crosstalk can be permanent knock on affect of snrm. :p
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ejs

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Re: Fastest ever downstream performance
« Reply #46 on: February 03, 2017, 01:37:18 PM »

And aesmith will be (very slightly) less vulnerable to this badness than I am, because I may have some 1-bit tones on day zero, whereas he, being G.992.1 iirc, will have a minimum of 2, so less close to zero.

I don't think that makes any difference. If an ADSL1 2-bit tone no longer has sufficient SNR, it gets bitswapped to zero, same as when an ADSL2 1-bit tone no longer has sufficient SNR.
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ejs

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Re: Fastest ever downstream performance
« Reply #47 on: February 03, 2017, 01:40:27 PM »

Weaver at least its temporary on adsl :) on vdsl crosstalk can be permanent knock on affect of snrm. :p

My ADSL2 line seems to be suffering from about 2dB SNRM worth of crosstalk, which has been pretty much permanent apart from a few blips consistent with a modem being rebooted.
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aesmith

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Re: Fastest ever downstream performance
« Reply #48 on: February 04, 2017, 08:57:12 AM »

Out of interest how do you know it's crosstalk, as opposed to external interference or other factors?
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ejs

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Re: Fastest ever downstream performance
« Reply #49 on: February 04, 2017, 09:53:52 AM »

I don't really know, but it appears consistent with a noise source of constant strength that's on almost continuously, apart from a few upward spikes of SNRM which are consistent with a modem re-connecting or rebooting. Occasionally it's been off for half an hour or so. The SNR per tone graph doesn't show any new interference on any particular tones, just a general reduction of SNR across the whole range.

I might have spotted a previously unseen BTHub3 from scanning the wifi at the time, but this isn't terribly conclusive, and I don't seem to have made any note of the exact wireless SSID.

It started on 22 July 2016, 10 January 2017 was the most recent time I've seen the SNRM spike upwards.
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