Re: 28800 modems?

Re your comment that the "X2" technology takes advantage of the way the 
phone system works.  That's correct, however for anyone who may make 
international calls out of North America, the phone systems in many other
countries (eg. all of Europe) work differently, and you could not call with
a "X2" modem to them.  As I understand it, there will be slightly different
"X2" modems that will work WITHIN Europe for example, but you won't be able
to call between countries with the different phone systems.
(No big deal for probably 99% of those who would buy one).


On Wed, 23 Apr 1997, PaulMmn wrote:

> At 11:01 PM 4/22/97 -0400, Don wrote:
> >
> >Dumb question, doesn't telco basically have a effective datarate on
> >switched analog lines of about 37kb???  
> 
> 
> 33.6, if the modem ads are any indication.    (:
> 
> >From what I've read, this is the max (after you add in v.32bis v.42bis etc
> etc) that you can cram thru an analog phone line.
> 
> Except if you use the x2 technology, which (as I understand it) 'cheats,'
> and takes advantage of the way the phone system works.
> 
> The phone company hates the newer modems, with the data compression and
> error correction.  They built the long distance lines with the expectation
> of voice connections... and there's a lot of 'quiet' on a voice call.  They
> planned on using the silence with their multiplexers so they could get more
> calls in a single channel.  Modems, on the other hand, effectively cram data
> across the entire voice bandwidth all the time; there is no 'quiet' time, so
> a modem call can't be multiplexed.
> 
> 
> --Paul E Musselman
> PaulMmn@ix.netcom.com
> 
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