| From: | Neil Bothwick |
| Date: | 26 Jul 2001 at 23:11:12 |
| Subject: | Re: Different modem performances & AA23 |
Jay Cornwall said,
> On 26-Jul-00, Nicholaus Darley-Jones wrote:
>> Anyway, I am now using the Twister and am pleased to say that it is
>> definately quicker, but I am still not happy :-( I still can't connect to
>> the modem at 230400 baud using MiamiDX and now think it is my modem that
>> is causing the problem.
> Why do you want to connect to a 56k modem at 230400 baud? 115200 is
> sufficient, and using values higher than this may even result in *lower*
> data transfer rates.
115200 is *not* sufficient for highly compressible data, like text. The
fact that a file full of normal text transferred no slower than an
"empty" (and therefore almost infinitely compressible) file indicated
that the modems were already delivering text faster than the serial port
could handle.
>> I am using a 3Com US Robotics X2 modem but I would like to know what is
>> the best modem to use. Although it connects at 50666 and miamiDX reports
>> that I can get 5.6Kb/sec when listening to a Shoutcast stream, it won't
>> use 32kbps+ streams without breaking up every few seconds.
> The continuity of a data stream isn't only determined by your Amiga's
> ability to transfer data from the modem. There are a lot of factors which
> can affect it, primarily the bandwidth of the station sending the stream (if
> a server has a lot of users, it may not be able to sustain full, continuous
> streams) and the general quality of connection between you and the server
> (your ISP, routers in between, their ISP etc.).
This is why RealAudio is better suited to streaming audio than MPEG. If
a couple of packets of MP3 data, which uses TCP, are dropped, the
system asks for those packets to be resent and waits until they have
before continuing. RealAudio uses UDP and if a packet goes missing, it
goes missing. There is a minimal glitch im playback that you probably
won't notice.
Cheers
Neil
The careful application of terror is also a form of communication.
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