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Originally Posted by Dave2150
I am 3.5KM from my BT exchange. I sync at 2300-2800kbps. A BT engineer who installed my second phone line (I bought a second line in the hopes it would have less attenuation that the first, and it was actually alot worse....) said that the line is exactly 3.6KM from the greenbox at my street to the exchange. My house is 60M from the greenbox.
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Unfortunate.
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He said that the reason my Attenuation is 58db is because of the alumimum lines installed decades ago. I can only guess that as you said, I got lucky and got the "special" low grade aluminium somewhere along the way.
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Yep probably.
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You say that in the worse case scenario adsl is still stable. Lets use my line for example. I sync at 2800kbps during the day, but during the evening when everyone comes home, crosstalk or some interference comes into play and affects my SNR, causing my modem to loose sync, and resync at 2300-2400 etc. This can happen few times a day/night, depending on who is firing up their connectinos I assume. Loosing sync is a nightmare for me, being a heavy online gamer, or when im downloading overnight etc.
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Nah I said you were quoting the worst case scenario
Max can be painful and for some people has been, however a large number of people are getting better speeds on it. I agree it could have been handled better.
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Also, as I assume you are unaware, when the sun does down ADSL SNR is affected - even on the really short low attenuation lines, the SNR drops a db or two. This can lead to more CRC errors, which will affect your throughput. BT have combated this by introducing interleaving, which increases our pings by 10-20ms Great if you are an online gamer.
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Actually no I was quite aware of the effects, it's largely from increased RF interference from people coming home, switching their own DSL on causing near end crosstalk, switching microwaves, TVs, etc on and that causing problems.
Interleaving is a part of the DSL standards and is there to introduce stability. If you don't want the convolutional interleaving there you can ask your ISP to set your line interleave free. If it's a gack line though you may well see lower throughput from the CRCs you describe anyway.
Did you know ntl have *slight* interleaving on their network to combat noise as well?
Again worst case scenario, find the cheapest ISPs with the worst service. You could just as easily have linked to someone like Zen whose customer service is very well respected, however rather than this you persued your own agenda by linking the cheap and nasty services.
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In fact our ADSL is so bad our estate of 7 newly built houses are in talks with NTL to costshare £5999 between us to have it cabled up.
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Sorry to hear that. You're the exception rather than the rule, I trust you realise this. There are millions who are quite happy, you may not be and that's unfortunate but not everyone is that way. Same with most things that have 8 million customers and counting unfortunately.
Fact is you're generalising. You know this and I know this and because DSL is a bad product for you it certainly doesn't mean it would be for OP. If he's in a similar situation to me he could obtain a far higher quality of service from DSL than ntl are providing at the moment.