Re: [CAD_CAM_EDM_DRO] Re: Optimizing cutting paths - The proof

Peter Harrison wrote:

> >
> >When transferring files over the internet, it is important to
> >understand that ascii files are subject to lightning strikes,
> >wiretaps, any kind of static might affect the transmission of the
> >data around the world. Therefore if you try to use an ascii format
> >to define a drawing it might have a problem.
> >
>
> Oh please...
>
> Just about all the original Internet protocols are based around text
> transfers. So reliable is the transfer of text (as long as it is seven
> bit ASCII) that email attachments are converted to text for
> transmission. If there is a problem, it is potentially in the
> transmission of eight bit ASCII and binary files that are treated as
> eight bit ASCII.
>
> Data, in general, transmitted via the Internet is remarkably stable. The
> protocols used are error detecting and error correcting. I don't recall
> a provable error in data transmitted from end to end. Sure there may
> have been all manner of mess in the middle but the Internet protocols
> guarantee correct delivery (although they don't actually guarantee
> delivery itself).

I probably shouldn't pick this nit, but the protocols do not guarantee
correct delivery to an absolute degree. They do guarantee that all
data that passes the CRC tests will be accurate to one part in 65,536
because the checksum is only 16-bits. Actually, the error could be
even more likely, if the error had a particular pattern to it related to
the simple way the checksum is calculated. But, it seems pretty reliable,
anyway.

>
> You are much more likely to suffer data corruption on your own PC when
> just copying files from folder to folder. There is no error checking
> involved by default.

Yes, quite true!

Jon