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Date:      Thu, 30 Oct 1997 09:20:36 -0800 (PST)
From:      Tom <tom@uniserve.com>
To:        Kristian Kennaway <kkennawa@physics.adelaide.edu.au>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: Crappy modem upload bandwidth
Message-ID:  <Pine.BSF.3.96.971030091659.27824A-100000@shell.uniserve.com>
In-Reply-To: <9710301349.AA01649@bragg>

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On Fri, 31 Oct 1997, Kristian Kennaway wrote:

> rates, but it slows to an average of like 50 bps when I try and upload. 
> What seems to happen is that the modem sends in very short bursts 
> "bursts" at close to full-speed, then idles for a minute or more before 
> doing the next one. Before this happened, I had no problems uploading 
> from my computer..

  Sounds like flow control between your computer and modem is not working
right.  The modem should be set for hardware flow control.

  What is happening, is that the computer to modem speed is 38400
(probably), but the modem-to-modem speed is 14400.  This poses a problem
when sending data, as at 38400 the modem's buffers will very quickly fill
up.  The modem should be using flow control to stop the computer until its
buffers drain out.  Either the modem isn't using flow control, or the PC
isn't listening for it.

Tom 




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