[OLUG] Modem

[Daniel Pfile]

pbrutsch at creighton.edu (Phil Brutsche) wrote:
> 
> A long time ago, in a galaxy far, far way, someone said...
> 
> > 
> > 	When I dial into my ISP, I can connect at 49,600bps, but when I dial
> > directly into my computer and simulate a remote user connecting to the
> > network, it connects slower and the fastest I have had it connect it at
> > 33,600.  The modem is a USRobotics Courier Dual Standard.
> 
> Analog 56k modems (like your USRobotics) are limited to a 33.6k upload
> speeds (you are literally uploading when you connect from another PC with
> a 33.6 or faster modem).  Your ISP uses digital modems, which, apparently,
> are quite a bit different.
> 
> 
a 56k connection, which is 56k down to you, and 33.6 up to the isp, 
relies on there being a digital connection between the isp and the phone 
company. when you dialed to your computer, you didn't have that digital 
connection, so you didn't see a fast connect... you got the max an 
analog connect could do, which is 33.6. if you wanted to have a dialup 
pool that would support 56k, you would need to get a digital connection 
from the phone company, and probobly a term server. The isp i used to 
work at had a term server with a set of t1s (instead of normal phone 
lines) for dialup going to the telco. When the user called us, their 
call would come in over the t1s, and into our term server's usr modems.

what you get when dialing your isp:
you <== analog ==> telco <== digital ==> isp

what you get when dialing your own computer
you <== analog ==> telco <== analog ==> you2

it stinks, but that's the way it is...

oh and i'm sending this with mozilla's nightly build... mozilla has come 
a LONG way :) IMAP even works pretty good now! on the downside, my 
attempt to get evolution working crashed and burned... i build 
everything fine, but it cored on startup, anybody else get it to work?

Daniel


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