Guenter Bietzig wrote:
>
> Hi all modem experimentators,
>
> On Sun, 17 Dec 2000 10:35:59 +0100, Joerg Dietze wrote:
>
> > Hi Christof and all,
>
> > what is the speed of Your com port? Some time ago I figured out that A.
> > loads smoother when speed of com port is set to lower value than modem
> > connection. When my com1 was set to 115kbps there were many stallings
> > while d/ling files which were totally gone with 38400.
>
> that's also my observation. With a 486/100 Mhz, UART16550 and 56K-Modem
> the best throughput (for me) is with COM-Speed 28800 and Modem line
> speed 33600.
> If setting Modem line speed to 56k, with my telephon line, I get
> a maximum of 44k.
> On a PIII/450Mhz I've got the same result. Setting COM-Speed above 28800,
> on both machines, I get a lot of errors in Arachne's TCP/IP-Statistic which
> will slowdown any download.
> I think the (packetdriver) epppd.exe and/or the COMx-part in core.exe
> can't handle such speed.
Hi Guenter;
Yes, that's probably one place to look for the problem.
The soon-to-be-available replacement for EPPPD.exe is LSPPP.exe written by
David Lindauer in ASM. It's smaller and faster.
The real point to be made is that if the comm link works better with a lower
LOCAL baud rate, then this shows that a problem exists in the software, and
lowering the baudrate is just a temporary solution. (16550 assumed)
If the line can't support a high transfer rate, then the modems themselves
should negotiate a lower line rate automatically. This will have no effect
on the internal rate, the bytes will just be further apart in time. <g>
- Clarence Verge
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