Hi,
On Sun, May 12, 2002 at 09:54:20PM +0300, Shaul Karl wrote:
> > Can anyone recommand a modem which works on linux and supports
> > voice/fax recongnition , caller ID , v.92(if there are any).
> > Also I don't have any ISA slots in my computer so I need either pci one or
> > external.
> >
> > after weeks of looking help would be most appriciated
> >
> > Ely Levy
> > System group
> > Hebrew University
> > Jerusalem Israel
> >
>
>
> Have you tried the Modems section (21) of the LDP's Hardware-HOWTO?
>
> And a word (question?) about 56k connectivity:
>
> * You might be unrealistic about how much available bandwidth is on
> your
> modem line. Lets do the math for a typical 56k modem connection:
>
> 1. 56k modems = 56,000 bits per second.
>
> 2. You really DON'T have a 56k modem but a 52k modem per US FCC
> limitations.
>
> 3. You'll almost NEVER get 52k, the best connection I used to get
> was
> 48k
>
> 4. 48,000 bits per second is 4,800 BYTES per second (8 bits to a
> byte +
> 2 bits for the START and STOP RS-232 serial bits)
>
> 5. With an MTU of 1500, you will get (3.2) packets in one second.
> Since
> this will involve fragmentation, you need to round DOWN to (3)
> packets per second.
>
> 6. Again with MTU of 1500, thats 3.2 x 40 bytes of TCP/IP overhead
> (8%)
>
> 7. So the BEST throughput you could hope for is 4.68KB/s w/o
> compression. Compression, be it v.42bis hardware compression,
> MNP5,
> or MS/Stac compression can yeild impressive numbers on highly
> compressable stuff like TEXT files, but acutally slow things
> down
> when transfering pre-compressed files like ZIPs, MP3s, etc.
>
> Source: The LDP's IP-Masquerade-HOWTO.gz.
I personally get regularly 5.7-5.8 KB/s (and got 6.1 a few times) when
ftping bzip2 files.
>
> --
>
> Shaul Karl
> email: shaulka(replace with the at - @ - character)bezeqint.net
>
>
>
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Didi
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