E-Mail Sent to this address will be added to the BlackLists wrote:
Martin Burnicki wrote:
I've recently started to write a whitepaper about computer time
synchronization. It is not yet complete but already contains a lot of
basic information which may be helpful for folks who are not very
familiar with that stuff.
A preliminary copy is available here:
http://www.meinbergglobal.com/english/info/#whitepaper
Re: <http://www.meinbergglobal.com/english/info/cablelength.htm>
RS-232 signals (COM) via shielded data cable
dependant on cable quality
dependant on the baud rate of the signal (e.g. 15m at 19200 Baud)
Yes, _very_ dependent on cable quality.
However a Shielded Cat5e cable will work great
to 300m at 19.2k bps;
{I do it all the time, with "real" (to spec) RS232 drivers}.
Higher baud rates have shorter cable limits.
The capacitance of the cable
(even almost all normal "RS232 serial cables"),
turns the square waves into something the receivers
can't recover correctly.
{Take a look at the signals at the far end of the
cable with a oscilloscope!}
Personally I'm familiar with requirements and potential problems due to
cable types, etc.
However, I'm not the author of that web page and just saw that there are
also misspelled words on it, so I'm forwarding this to the guy who has
created that web page and hopefully will fix it.
Thanks for the hints!
Martin
--
Martin Burnicki
Meinberg Funkuhren
Bad Pyrmont
Germany
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