-=> Quoting Kris Steenhaut to Bas Heijermans <=-

 BH>  The
 BH> diverance with connect speeds has to do with your ISP-modem,
 BH> your-modem and the Telco(mpany). SIO, QCOM or any other driver have no
 BH> say in this, my experiance here in Belgium is that you have to force
 BH> your modem to 44000 or lower to have stable connections.

 KS> You are entitled to your experiences. With the Sio I had stable
 KS> connections at 453000, with the Quatech at 48000 or 49000. That's with
 KS> an 3Com 56k faxmodem. 

It's not a matter of experiences. It's a matter of how the *hardware*
works. The bps rate of the connection is determined by the *modems*. No
software running on the computer can possibly affect this. 

The drivers can only affect the rate that data travels between the
modem and the serial interface (even internal modems have a serial
interface, it's just built onto the same card. 

Whatever the source of your difference in connect rates, it's *not* the
drivers. If nothing else will convince you, stop and consider just
*where* the CONNECT XXXXX message *comes* from. It comes from the
*modem*. The drivers don't affect the modem at all. Just the serial
port. So how on earth can they make the modem report something
different? 

The modem will report the *same* connect rate whether it's hooked to a
computer running OS/2, Win95/98, Linux, etc. Or if it's hooked to a
dumb terminal. 

Drivers *can* limit the rate at which data moves from the modem to your
system. But that's *not* the connect rate! Dig up some books on serial
communication and find out the difference between DCE rate (modem to
modem), and DTE rate (modem to computer). The CONNECT 46000 is a DCE
rate, *not* a DTE rate. 

It's possible to get CONNECT 46000 with a DTE rate of 1200 bps. And
yes, you are limited to whichever of the *three* rates is *slowest*.

              DTE            DCE             DTE
your computer  your modem  their modem  their computer.

So whichever rate is slowest (your DTE, their DTE, or the DCE) is the
transfer limit. Your drivers determine whether or not your OS can
handle data ass fast as it comes at high DTE rates. But the *hardware*
is still running at whatever DTE rate you set, probably 115200. 

 KS> With ISDN, it doesn't make any difference at all, apparently.

Of course not. ISDN is a *fixed* transfer rate. 64kbps per B channel,
16kbps per D channel. Certain types of (older) B channel hardware steal
bit 7 for synchronization purposes. On those links, 56k is the limit.
They rare and getting rarer.

But again, even *thinking* that the drivers would make a difference
here merely shows that you don't understand how the hardware works. 


--- Blue Wave/DOS v2.30