In reply to:

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There's more to line speed than just the attenuation figure. The SNR of the line is just as important.

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SNR = Tx power - Attenuation - Noise

I would say the SNR and hence the speed are a result of the attenuation and the noise level, so good speeds can be if the noise is low. Your line 1 looks noisy.

BT don't care what you do to your extension wiring.

In reply to:

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Your line 1 looks noisy.

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It is. It goes for about half a mile overground, and it then travels about a mile over aluminium. Line 2, on the other hand, goes underground all the way, and over copper all the way. It's a great example of what overground cables and aluminium cables can do to your broadband.

Agreed.
A low noise line is the key to getting higher and more stable syncs with a high attenuation long line, and is more important than line attenuation alone (I'm able to hold sync for longer than many with much shorter lines, and end up on a good IP profile because of the good stability allowed by my line).
I consider myself to be very lucky, in being able to sync at 4096kbps (at 6db noise margin) on a 6.9km line with an attenuation of 57db.
Admittedly, if I want a stable sync (to hold for more than a few days) I have to deliberately sync during medium to high noise periods (resulting in a sync around 3600kbps, which will hold for weeks if I leave it alone).

It is. It goes for about half a mile overground, and it then travels about a mile over aluminium. Line 2, on the other hand, goes underground all the way, and over copper all the way. It's a great example of what overground cables and aluminium cables can do to your broadband.


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was that talking about my line ? sorry i missed these to posts

hey i got this reply from plus.net

The only way in which a charge was incurred by yourself would be of the fault was due to your equipment or setup. The tests that we have completed so far would indicate that this is not the case.


any idea of what the "tests indicated" ?


p.s. i am synching at an all time high tonight of 1.9mb :O with an SNR or 10 (3am :') i should get some sleep )


do you think they are lowering my target SNR. (which my isp said they would ask BT to do )

Edited by iLLegaL (Fri 27-Oct-06 03:43:29)

No, it was a reply to Yarwell. Read the header, or don't use flat mode.

my Line attenuation has been up and down over last few days

peaking at 63.5 (apprently max. figure that modem will report)

and right now, it is at 56db

is this a wiring fault or something, because i heard people saying a change of 1db is big

An increase of 3 dB means half the signal strength, so it is a bit sensitive. Dodgy connection in plug, poorly terminated wires, line fault etc.