[ntp:questions] Explaining Technical Detail to Technically illiterate journalist

Martin Burnicki martin.burnicki at meinberg.de
Wed May 21 10:24:31 UTC 2014

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 Burnicki

Meinberg Funkuhren
Bad Pyrmont

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