Andrew Guard felt the Need For Speed...
> I was ready my copy of Amiga Format Issue 130 Page 51. Near of text block 2
> going in to block 3 it goes on about MNP comprssion. Can I do this with my
> modem and how do I set my modem to do it.
>From your sig. you have the same modem as me, which I can tell you
will support MNP5, but by default will try to use V42 LAPM compression
instead. V42 is generally better than MNP especially if the data being
transmitted is not very compressable. Most of the data involved in web
browsing etc is gif or jpg, neither of which will compress, so you'd
be best with V42.
Curiosity killed the cat: \N5%C1 in the init string will force it to
connect using MNP5.... \N3%C3 gets back to auto.
I always use the "straight" init of "AT&F\n" because most of these
complex init things do nothing different to what this modem does by
default, except disabling the fallback methods, causing failed
connects.
> Also is correct about baud rates can go up to 230,400 is you use MNP.
That isn't quite what the article says. Any type of compression can
permit a greater bit-rate throughput than the connection speed would
suggest. The article simply pointed out that many modern modems have
serial ports which could sustain 230,400baud. To actually get that
rate, you'd need a solid 56K connection at 4x compression, something
you're highly unlikely to get. In practise, a 50K (appx) connection
at 2x compression for a text file might get you near the limit of a
115,200 baud port. (About 12Kb/sec).
Your TCP/IP stack can also do various types of compression, most of
which you should switch off if you use a compressing modem. There was
a discussion about this many months ago by somebody who knew much more
about it than I do (which isn't hard..) :-) I think it was: Forget
everything except VJ compression.
Cheers,
Ian
===
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