On Thu, 17 Nov 2011 17:46:50 -0500, wrote:

On Thu, 17 Nov 2011 11:39:14 -0600, "
wrote:

The 56kb was not a federal regulation it was simply the limitation of
one channel of a T-1 line (actually 64kb) minus the overhead necessary
to move data on it. That limit still exists on a dial up line. You do
quite a bit better with ADSL but that is a different breed of cat and
the data is not moving through the switched network. It gets split out
before you get to the switching equipment.

No, there is/was an FCC regulation disallowing 56K (53K max for V.92). The
56K "limit" isn't T-1 speed (1.5Mb) limited, rather audio channel limited
(8kHz x 16b).


That is the whole T-1 and you can rent one but a dial up line only
gets one channel or 64kb of that.

Sure, but that's not the point. T-1 is a _result_ of the 8Kx16b voice
channel, not the other way around. The V.92 speed limit is caused by the
limitations in the voice channel.

The 56kb is really only coming towards you, Upload is still V.34
speeds.

True, (53K max down) for V.92. There are other modulation schemes that
balance it more. It doesn't matter much anymore because data over voice is
pretty much dead. Where it isn't, speed doesn't matter.