Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!cs.utexas.edu!know!theep!rk
From: rk@theep.boston.ma.us (Robert A. Kukura)
Newsgroups: comp.dcom.modems
Subject: Re: telebit speed
Message-ID: <1990Aug27.014916.1645@theep.boston.ma.us>
Date: 27 Aug 90 01:49:16 GMT
References: <150@grumbly.UUCP> <7841@gollum.twg.com>
Organization: Theeptronics
Lines: 36
In-Reply-To: david@twg.com's message of 26 Aug 90 21:04:42 GMT

In article <7841@gollum.twg.com> david@twg.com (David S. Herron) writes:

   In article <150@grumbly.UUCP> root@grumbly.com writes:
   >I've recently started using a Telebit T2500.  I'm getting transmission
   >rates of about 1700 cps from me --> uunet, but only 800-1100 cps 
   >from uunet --> me.
   >
   >Has anyone else noticed behavior like this?  I'm on the West Coast -
   >is the distance a factor in general?

   Possibly ... if the phone circuit regularly had noise in only one
   direction then you would see this kind of behaviour.

   What's more likely is that your machines aren't "equal".  That is,
   uunet is more able to recieve large bursts of characters than your
   system is.

   This might be because of small input buffers on your system.  Poor
   implementation of hardware flow control (or no flow control) on your end.
   Or your system might be slow.  (Face it.. Sequent's simply do not lack
   for CPU cycles... ;-) ...)

It could also be due to size of the files being transferred.  Your
system and uunet might not be using the same batch size for news.  On
my system, 50-70K batches seem to consistently achieve better transfer
rates than 20-30K batches.

   -- 
   <- David Herron, an MMDF & WIN/MHS guy, <david@twg.com>
   <- Formerly: David Herron -- NonResident E-Mail Hack <david@ms.uky.edu>
   <-
   <- Sign me up for one "I survived Jaka's Story" T-shirt!

-- 
-Bob Kukura		internet: rk@theep.boston.ma.us
			uucp: spdcc!theep!rk