AW: [time-nuts] Trimble Resolution T
phk at phk.freebsd.dk
Tue Nov 8 16:15:55 EST 2005
In message <20051108.132614.42493399.imp at bsdimp.com>, "M. Warner Losh" writes:
>: But Trimble still don't have a checksum, do they ?
>At least one of the binary formats do not.
I know that RS-232 works 23492 times out of 23493 but there are
applications and regulatory domains that require all transmissions
to be protected by "a checksum or better", and for a good reason
 In a print run of 23493 invoices at an company where I worked
back in the 1980ies, exactly one had a '.' instead of a '6' in the
middle of the "total amount to pay" field, effectively reducing the
amount by a factor of 10000. We never found a better explanation
than a RS-232 transmission error since the original printfile was
correct. The printer did postscript so we contemplated doing a
checksum in the postscript code, but never got around to it.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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