%-> Now, do we all agree that 56k modems will only download at a faster rate
%-> than they will upload ? from documentation i read that openly a
%-> 56k modem
%-> will only send at 33.6k
Depends... some stop at 26.4Kbps, others at 28.8Kbps; 33.6Kbps is the max
though, until V.92 comes out.
%-> So, when downloading I should get 56k right ? I mean hell,
%-> thats what they
%-> are sold as......
Depends again, on:
1. Your connect speed;
2. Phone line quality;
3. Modem chip set;
4. Modem firmware revision;
5. Access router modem chip set;
6. Access router modem chip set revision;
7. Client TCP/IP and PPP set up;
8. Access router TCP/IP and PPP set up;
9. Client hardware set up;
10. Access router hardware set up;
11. The number of chickens sacrificed to The Great Modem God ;-).
%-> Anyway, here is my problem.......
%->
%->
%-> With both ends being 56k modems, when the client is downloading, the
%-> terminal servers modem is uploading, and the upload speed of a 56k modem
%-> is...........how much again ?
Dividing the CONNECT speed by nine seems to give a reasonably accurate
estimate. Don't forget that 56K modems retrain according to line conditions.
3Com/USR modems provide good diagnostics with ATI6 (if I remember right,
haven't used a modem for ages); Rockwell ones... hmmm... isn't it AT&11?
%-> Also I believe its mainly a compression mechanism in 56k modems which is
%-> better, I am also under the belief that compressed/zipped files
%-> generally
%-> cannot be compressed any more, and more processing speed may be taken up
%-> attempting to do so......
Newer hardware compression algorithms are supposed to be clever enough to
discern whether or not data is compressed, but I don't know about software
compression. Anyway, in my experience, the best performance has always been
with hardware compression only, and with software compression completely
disabled.
Latency is a big issue as well for packetised connections. A 56K modem is
ostentatiously nearly as fast as a single channel ISDN link (64Kbps). In
reality, even if the 56K modem sits on a crystal-clear phone line (unlikely)
the connection will have much a higher latency than an equivalent ISDN line
and will be much slower. There are several excellent dissertations on the
latency issue on the Web but of course I can't remember where they are at
the moment... ;-)
Cheers,
-- Juha
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