achieving 19200 baud on the UNIX PC

[John C. Sucilla]

In article <1060 at umbc3.UMD.EDU> alex at umbc3.UMD.EDU (Alex S. Crain) writes:
>	I would be interested to see if two 3b1's could sustain 19Kb (or
>higher) file transfers (uucp or whatever). Anybody ever tried?

Well, for what it's worth my 3B1 (tarkus) has a TrailBlazer+ on tty002
and it's locked at 19200 between the modem and the machine.  I just started
talking csdev's 'Blazer (csdev is another 3B1) and the average throughput
so far is 947 bytes per second.  I'm not sure if Garry's 'Blazer is locked
at 19200 like mine or if it's set up for 9600.

On the other hand, tarkus gets it's news feed from ddsw1 (a Tele-386)
with a 'Blazer set to answer at 19200.  I just got the latest maps
from Karl over there.  The 2,176,135 byte xfer got here at 1031 bytes per
second.  Sending small files like mail shows even greater throughput.
A 1500 byte file can be dumped into the 'Blazers buffer in one chunk
and would show a througput of > 1500 bps.  I think the highest number I've
seen was a little over 1700 bytes/second.  Therefore yes, the 3b1 can
handle 19200 baud.  The slower rates can be blamed on uucp overhead
and Telebit turning the line around.

BTW:  19200 is the max for the UNIX-PC, it'll never do 38K as is (Grrr).
-- 
John "C". Sucilla,  A silicon based life form.
       {ihnp4,chinet,ddsw1}!tarkus!jcs
  You have a better idea? Now's the time..