On Fri, 16 May 2008 02:00:45 +0200 Michelle Konzack wrote: > Am 2008-05-15 09:08:45, schrieb Michael Adams: > > 56kb = 56000 bits per second. As serial data it is not 1024 bits per > > k > > This is not right since my US Robotics Courier I-Modem is a 56k > ISDN-Modem and has definitivly 57600 BpS. The same is vor my > USR 56k Voice Modem. It HAS 57600 BpS. > > > but 1000. It is also a maximum theoretical limit never usually > > attained in real world situations. Using 50kb in an urban > > environment is often much nearer the real world truth, distance from > > the exchange and line interference tend to be the two most common > > losses. Note that expecially in windows reported connection speed is > > the speed that was originally connected at and it can drop over > > time. Very few modems negotiate higher speeds again if line noise > > clears. For a long download you could then guess at around 45kb > > average for a 56k modem in an urban environment, much worse in a > > rural area. > > I get even in teh Turkey in a distance of more then 50km rates arround > 45 kBps not only in the cities... >
Do not confuse the data rate from the computer to the modem (which probably should be set to a 115200 connection speed, to ensure all additional data gets through to the modem, and then can be compressed) with the line speed. http://www.mepis.org/node/11825 > > Hardware compression works at the packet level whereas zip works at > > the file level so V90 compression may still have a useful impact > > (not my field of knowledge, so i cannot say how much). > > Not realy, since if the modem TRY to compress it lost time... > ...and then it is slower. > Compression happens on the fly faster than it can squirt it into the phone line. Compare mp3, vorbis and mpeg compression during playback. They get uncompressed faster than the music or video can be played. -- Michael All shall be well, and all shall be well, and all manner of things shall be well - Julian of Norwich 1342 - 1416 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
