Subj : Re: error corrcting software + location on pc
To   : comp.programming
From : Rob Thorpe
Date : Wed Sep 07 2005 05:04 am

species8350 wrote:
> I am a little confused.
>
> I thought that the Hamming codes would code the original data. This
> data would then be sent over the Internet and would be checked on
> arrival. If this is the process, there must be a programmme on both
> machines that check the coding. Presumably if incorrect, fresh data
> would be requested by TCP/IP?????.

Error corrective codes are used at all kinds of different levels.
For example DVD and CDs contain error corrective codes that are dealt
with by the drives themselves.  But the user may choose to use error
corrective coding on the files they store (though few do).

Similarly some systems over which data is transmitted use error
corrective codes, the codes are added when the data is put into the
media and removed and used at the other end.  People may also use error
corrective codes in the protocols that exist in the layers above.

Many systems also use retransmits.

.