On Mon, 29 Aug 2005 14:37:48 +0100, "Barry" <(E-Mail Removed)>
wrote:
>Are you saying that <40dB is the determining factor and absolute limit? And
>who determines this measurement, is it BT? I seem to remember that my line
>has reported differently on different speeds, so at what speed would it need
>be measured at to determine if a line is capable of 2MB?
the 2M limit was 41 dB with "amber" to 43 dB, then the 43 dB was
accepted as "green" for 2M a year ago. I am not clear if this was
reversed recently.
My point about the 40 dB was that the lower it is the better the case
and the less chance of someone claiming its an inaccurate measurement.
>Does this figure change depending on the speed of the existing connection?
>I'm currently on a 1MB connection here, and my Netgear DG834G is reporting
>49dB Downstream Attenuation. Does this mean I can or cannot get 2MB here?
>Some time ago, I was on a 512k connection, and this figure was a bit lower
>(I seem to remember).
attenuation is influenced by frequency, so runing faster speeds may
well show a higher loss if it uses higher frequencies.
>Finally, isn't there anyway that the OP can get BT to update their records
>directly, or don't BT update their records regularly on their own? Is there
>a number you could ring to query the speed at which your line is rated in
>their database?
its the ISPs job. They are the retail supplier. ADSLguide forums is a
back door route but the ISPs should be doing it.
Phil
--
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