🚀 go-pugleaf

In article <ACEE07639668A393@ehrice.his.com>,
Edward Rice <ehrice@his.com> wrote:
>In article <4a7p2p$da3@access4.digex.net>,
>zbang@access4.digex.net (Carl Zwanzig) wrote:
>
>  > In fact, it's not Digex's problem. Not at all. What a 28.8 modem is
>  > doing is almost like trying to drive your car (6'wide) through a
>  > 6'-1" concrete tunnel. It can be done, but don't let the mirors stick
>  > out too far, and make sure that the tunnel is REALLY 6'-1".
>  > 
>  > ...
>  > 
>  > Give credit where credit is due, if Digex connects 28.8 modems to the 
>  > lines, but the lines refuse to carry the data, go after the carrier, 
>  > not the provider.
>
>This isn't quite right, either.  The original complaint dealt with...
>
>>As background, traffic from the Baltimore area to the Beltsville
>>site is routed down high capacity circuits known as the SLC 96 or 
>>"slicks".  These trunks handle traffic in the 200 Hz to 3300 Hz
>>range.  Modems operate at the high end of  this range, and 28.8 Kbps
>>modems negotiate at a frequency of 3750 Hz.  The "slicks," in  
>>other words, cannot support a 28.8 Kbps connection over the phone
>>network.  Therefore, DIGEX cannot guarantee 28.8 Kbps access to its 
>>customers at this time.  The "slicks" are guaranteed by the 
>>manufacturer to support 19.2 Kbps connects, but they are only part of the 
>>total connection from the customer site to DIGEX.  


I think some of you are probably missing the point.  If you are a
high-volume line subscriber (re: buy a lot of phone lines), then 
instead of running hundreds (or even thousands) of pairs of copper
into a customer location, they run Fiber (or T1's) into a "slick" 
that breaks everything down into normal analog phone lines.  I can't
vouch for the speed capability of a specific slick, but unless they 
purchased there own slicks they didn't have any say in what was 
installed at there location.

As per BellAtl (and most general phone specs) they are only obligated
to supply you with 300-3000 hz of audio response.  If you look at this 
it breaks down to about 2700 hz of audio bandpass.  As per the V.34
specification, you need 3200 hz of available bandwidth, and even at
26.4K you need 3000 hz.  Needless to say BellAtl does NOT have to
provide you with this good of a line.  If you are lucky and get that
much than be happy, but unlike the 14.4K days, the new 28.8K (and even
more so on the 33.6K) won't always connect at 28.8K.  Personally from
my house I have rarely even seen a 28.8K connect, and generally if 
I did get that fast a connection it dropped back quickly.



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