🚀 go-pugleaf

[POSTED TO comp.dcom.modems]
4ms2u$ms@michaels.demon.co.uk (Michael Salem) wrote:

>In a previous message there is a calculation of the bytes/second (BPS) as a
>function of the bps (bits/second rate of a modem). The BPS is given as
>exactly one-tenth of the bps. As the message says, there is also
> "Noise on the modem connection, ISP delays and lost packets 
>which
> "all contribute to a much lower realistic data transfer rate.
>
>Additionally, good modem protocols (e.g., MNP) improve matters by not
>requiring all the start and stop bits (before compression is taken into
>account).
>
>I found that on a good 28800 bps ZMODEM link data flowed at a fairly
>reliable 160KB/minute. Downloads from Web sites go at the same speed 
>in the best of cases, down to much much much lower.


On a good link you should be able to do much better than that, 
over 190 KB/min with compressed data.


>Generalising, the actual download speed in KB/minute is about 5.5 times
>the connection speed in kbps.


More like about 6.75.


>This is useful, rather than theoretical, 
>knowledge, as you can estimate the best-case time to transfer a file.
>
>E.g., 1MB at 31.6kbps will take at least 1000/(31.6 * 5.5) = 6 minutes.


You should be able to do it in less than 5 minutes.


p.s.  Please stop the inappropriate cross-posting of this thread!

--
Best regards,
John  mailto:JNavas@NavasGrp.Dublin.CA.US  http://www.aimnet.com/~jnavas/
      28800 Modem FAQ:  http://www.aimnet.com/~jnavas/modem/faq.html