Routerstats SNR wave

[gingerjedi]

Does anyone know why the graph would look so different over a period of just a few days?

The first one has very obvious flat peaks and troughs, the second is comparatively smooth and the third is very jagged.

I was just wondering if there was an expert out there who understands why this would be?

I'm on standard ASDL home 2000 BTW.

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[gingerjedi]

Only 2 attachments per post 

Third:

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[Rik]

Change the scale of the graph to run from 0db to 16db, this will give a better picture of what is going on. Personally, I see little difference between 1 & 3, both show lost of noise. The second graph seems to reflect a quieter day.

[gingerjedi]

My SNR often hits 21-22dB so 16 would be out of range, I'll set it to 24.

On the first graph their seemed to be something limiting the maximum SNR to 12dB, this is something I had never seen it do before?

[Rik]

I wonder if you got switched to a Max product? Otherwise it would suggest a general level of noise depressing the margin at all times.

[gingerjedi]

I was on ADSL Max when I was with Tiscali (spit!) which was absolutely useless so when I moved to IDNET I requested a standard ADSL Home 2000 package, is there a chance something wasn't switched over properly? I l always sync at 2272kbps up and 288kbps down which is what I would expect.

[Rik]

No, that sync is correct for a fixed-rate product. I was just wondering if the DSLAM had had a little excursion for you - did you happen to check your sync speed during the 12db period?

Looking at the amount of noise you do get, though, I think fixed rate is definitely a better option for you.

[gingerjedi]

I did! It hadn't changed form the usual.

I accept I am out of spec for a 2meg product (47dB attenuation) but I just don't understand why the noise and line drops are so random? Weather and time of day seem irrelevant.

I usually give up trying to get it fixed but every few months it gets on my nerves and try and get to the bottom of it again, this is probably the 4th or 5th time I've looked into it.

Everytime I get BT involved the problem clears up.

[Rik]

A bad joint would make sense. If they re-make it, it would clear the problem for a while, but if they don't tackle the underlying cause, eg a leaking duct, it will return.

[gingerjedi]

Sounds about right, the last time the engineer came he said he had done something down the road but I didn't know if he had or he was just fobbing me off??

The strange thing is we can have days of heavy rain and it will be fine, likewise we've had some hot days recently but it's only played up on 1 or 2 of them?

I'm sure theres a guy down the exchange who keeps spilling coffee or something.

[Rik]

It would be worth keeping a weather diary to see if that gives any pointers.

[Sebby]

Out of interest, what router do you have?

[gingerjedi]

Netgear DG834GT, I've also got a Belkin F5D7633-4 which is very good but no mater what I try I can't co figure routerstats to work properly with it?? I've also tried a Linksys SuperG which was OK but a pain to configure my wife's VPN requirements and there was no SNR readings at all.

Overall the Netgear is the easiest to use but the Belkin is the most stable, they both drop sync though.

[Sebby]

I'm not 100% what chipset that uses, but I think it might be the Broadcom, in which case my theory falls down.

[MoHux]

Hey Ginger, a l  o  n  g  time ago in another incarnation , I used to know a bod by the name (IIRC) of 'Phantom Flan Flinger' ------- wouldn't be you would it? 

Mo

[Rik]

I really have to know how you made that leap of logic, Mo.

[drummer]

I really have to know how you made that leap of logic, Mo.

The ability to retain trivia helps (mea culpa).

http://www.amazon.co.uk/Phantom-Flan-Flinger-T-Shirt-Black/dp/B000UVZBEY

[gingerjedi]

Hey Ginger, a l  o  n  g  time ago in another incarnation , I used to know a bod by the name (IIRC) of 'Phantom Flan Flinger' ------- wouldn't be you would it? 

Mo

Sorry... Not me guv'.

[Rik]

The ability to retain trivia helps (mea culpa).

http://www.amazon.co.uk/Phantom-Flan-Flinger-T-Shirt-Black/dp/B000UVZBEY

Some memory store you've got there, Drummer, though I'm not sure that "The best of Tiswas" isn't a contradiction in terms.

[MoHux]

I really have to know how you made that leap of logic, Mo.

No leap Rik. 
They both used the same Avatar. 

@Gingerjedi:  Thanks for taking time out to reply! 

@Drummer: I really didn't know about the T-Shirts.  The chap I knew was several years ago!

Mo

[Rik]

Thanks for that, MO, I thought you were using your psychic powers again.

[gingerjedi]

I've just ordered one of these, I don't know if it will make much difference but it's worth a try over the standard flat ribbon cable I'm using now, saying that... I do wonder why I bother shielding the last 7 feet when BT doesn't give a toss about the other 7,000. 

I've just seen the same one on the PC World site: linky £18.94 delivered compared to Play's £2.99! I don't think I've ever seen such a massive disparity in prices.  

[Rik]

I use one, it seems to be better than the supplied cable, but that's not science, just observation. The big difference should come from the twist, which flat cables don't use and BT's cables do. The shielding may add a bit more.

[gingerjedi]

I don't expect it to make much difference but having good internal wiring along with top notch filters and cables gives me some reassurance that I have done the best I can at my end. 

[Rik]

That's it, Ginger, we do the best we possibly can, then it's up to BT to deliver.