Brian Duncombe ([log in to unmask]) wrote:
: I have a DTC 16iX but it seems that when I called RC to find out how to make
: it work at 38,400 I was told that it only worked at that speed for something
: other than RS232.  I got the feeling that 38,400 was technically supported
: but not practically usable.
 
: Am I wrong or did I miss something (or get bad advice).
: Brian Duncombe  [log in to unmask]
 
 
- Of course I cannot know what the "other than RS232" stuff was when the
  RCE mentioned it...  however, it might be related to the fact that
  I seem to recall that RS232 spec only talks about speeds up to 19.2 kbps,
  anything above (although may use the same physical interface wiring and
  signalling) is probably another standard.  I.e. the way I read this is
  that it's probably known under another standard because of the speed
  that RS-232 standard fails to recognize, although works just fine with
  RS-232 devices.
 
  From my time with DTC/X.25 connections I remember that as long as one
  stayed with speeds below or equal to 19.2 kbps, an RS-232 connection
  was okay.  Anything beyond that and one had to change to V.35 or V.36
  since there were no syncronous modems with RS-232 connections that ran
  with speeds > 19.2kbps.  V.35 and V.36 went up to 64 kbps.  I'm guessing
  that the RS-232 spec really doesn't (or at least didn't not so long ago)
  recognize higher speeds and maybe this is what the RCE meant(?).
 
  IMHO,  if I'm using a screen mode editor over a DTC connection and a dumb
  terminal, I'd prefer to see my screen painted in 0.5 seconds instead of
  1.0 seconds  (a 24x80 screen is 1920 chars (8bits ea) + stop and start
  bits - more or less 10 bits/byte to xmit, i.e. 1920 chars/sec = 19.2 kbps).
 
 
:-) Eero Laurila - HP CSY Networking lab.