[linux-help] Re: Serial data transfer -

[Jonathan Hall <jonhall@xxxxxxxxxxxxxxxxxxxxx>]

From memory... (I haven't used this technology for 4+ years, I'm undoubtedly
rusty)

XModem uses 128-byte data blocks, and Checksum error correction.

YModem uses 1024-byte data blocks, with CRC error correction

ZModem uses variable-size data blocks, with CRC error correction.  ZModem
supports resuming of interrupted transfers, and can change the block size on
the fly according to line conditions, etc.

B/c Y/ZModem use larger block sizes than XModem, they are faster due simply
to less overhead.  They don't do any compression, though.


On Fri, Nov 17, 2000 at 10:30:12PM -0600, Greg House wrote:
> On Fri, 17 Nov 2000, you wrote:
> > > You could also use xmodem, ymodem, zmodem (pick any one, zmodem does the 
> > > best
> > > compression, I believe). The easiest way is to establish your link and 
> > > login
> > 
> > None of those do *any* compression.  Zmodem has the best error correction
> > (CRC vs. Checksum) of those three, though.
> 
> Hmm.. I always thought they did. If it's not compression, then what's the
> difference between them (obviously, other then the error correction...)
> 
> Greg
> 
> -- This is the linux-help@xxxxxxxxx list.  To unsubscribe,
> visit http://tmp2.complete.org/cgi-bin/listargate-aclug.cgi

--
A Los Angeles man who later said he was "tired of walking," stole a
steamroller and led police on a 5 mph chase until an officer stepped aboard
and brought the vehicle to a stop.
--
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
 Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
         http://www.futureks.net  *  PGP Key ID: FE 00 FD 51
                  -=  Running Debian GNU/Linux  =-
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

-- This is the linux-help@xxxxxxxxx list.  To unsubscribe,
visit http://tmp2.complete.org/cgi-bin/listargate-aclug.cgi