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echo: os2inet
to: CHRIS PITZEL
from: LEE LEFLER
date: 1997-07-05 14:46:00
subject: Locking the Comm Port

 > Most, if not all modern UARTS are capable of 115200.  Heck, even
 > the 16550 (not the 16550A) on my old PS/2 model 80 machine is
 > easily capable of 115200 without dropping any characters.  And
 > that PS/2 machine is *10* years old.
      Watch the ones that are built onto the motherboard.  I have two
that aren't capable of running at any real speed.  A third board I didn't 
even bother to check, I just dropped a COM board in and moved on.
 > One of my IP (actually a local college) providers uses old
 > DECservers which lock the attached USR Sportster 33.6k modems at
 > 19.2, but in reality, because LAT is so inneficient, they only
 > get 14.4k speeds.  (the term servers aren't smart enough to run
 > their own PPP, so the PPP has to be run on a VAX system).
      LAT shouldn't have any trouble running 19.2, we use it on
ethernet.  I suspect the problem is in tunneling TCP/IP or the VAX itself.  
We've upgraded our system to use Shivas, but with a little work we could have 
done it with Multinet or UCX through the VAX.  The drawback there is that it 
adds to the work of an already overloaded VAX cluster. Just tell them to get 
a new hub with some PPP capable servers for their modems. 
-ll
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