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echo: os2hardware-l
to: Steve McCrystal
from: Roy J. Tellason
date: 1999-09-05 19:19:15
subject: SIO

Steve McCrystal wrote in a message to Roy J. Tellason:

 PK>> can possibly affect the Analog interface of a Modem?



 SM> With all due respect, that's disappointing... coming from you.

Boy,  am I getting it for this one...     

 SM> While the first part of what you say is quite correct, there is 
 SM> simply no way that a port driver, regardless of how well 
 SM> written, will affect the *analog negotiation* of connect speed.

I must try and make it a point to read this stuff more carefully.  I don't
think I wrote that with "analog negotiation" in mind,  nosir,  not at all...

 SM> At the time the analog negotiation/handshake/whatever you'd 
 SM> call it takes place, the modems don't know what they are 
 SM> connected to, or what driver is controlling the ports, nor do 
 SM> they care!  The negotiation of connect speed, and any 
 SM> subsequent shifts up or down as required, is entirely conducted 
 SM> between the modems, without respect to the quality of the 
 SM> drivers or the serial port hardware.

Isn't there an upper limit in place,  though,  determined by the
modem-to-computer connection speed?

 SM> Now, it is possible for *flow control* (Xon/Xoff or RTS/CTS or 
 SM> both) to affect *throughput* due to differing driver quality, 
 SM> but that is unlikely on anything newer than a 286 machine (even 
 SM> with 16450 UARTS) and that has nothing whatsoever to do with 
 SM> the negotiation of *connect speed*.

Throughput was probably a lot of what I was thinking of there.

I guess I oughta make it a point not to post when I'm tired,  too...

--- 
102
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