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Article #18082

Re: 33.6!!!! 28.8 would be nice

#18082
From: Steve Barnes
Date: Mon, 25 Nov 1996 00:00
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In article <CiY4pCADyCmyEwid@chookang.demon.co.uk>, Alan Choo-Kang
<alan@chookang.demon.co.uk> writes
>
>Also, if I set the connect speed to be 115 200, I get loads of overruns.
>This shouldn't be the case using a 16550 UART should it?
>
>Any help would be appreciated,
>
Yep, I a am afraid so!  Without a Fast UART you have no hope of
successfully using the higher speeds, even if you get a connection at
the high speeds the resulting overruns will result in a 'net' overall
speed that is slower than a lower speed connection!  This is because
each overrun will result in one or more retransmitted packets, which
might themselves overrun.  Thus you may well get connected at 28.8 but
have to get the data sent 3 or 4 times rather than connnecting at 14.4
but only having it transmitted once.

In general if you do not have a Fast UART between your computer and your
modem it is advisable not to try to connect above 14.4k and on some
older, slower computers, with limited memory and slow hard drives you
may find that 9600 works better than 14.4k.
-- 
Steve Barnes
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From: Steve Barnes <steveb@sjbcomps.demon.co.uk>
Subject: Re: 33.6!!!! 28.8 would be nice
Date: 1996/11/25
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