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[linux-help] Re: Serial data transfer -
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To: linux-help@xxxxxxxxx
Subject: [linux-help] Re: Serial data transfer -
From: Jonathan Hall <jonhall@xxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 18 Nov 2000 00:38:13 -0600
Reply-to: linux-help@xxxxxxxxx

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
> 
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