Setting the time
hmurray at megapathdsl.net
Mon Aug 27 14:28:36 EDT 2012
> In a school deployment, it is desirable that all of the XOs have the same
> time. This time should be synchronized with/by the school server (even if
> the school server is wrong). It is not reasonable to base this capability
> on access to the internet.
How closely do you need them to be synchronized? 1 second? 1 microsecond?
It should be reasonably easy to setup ntpd on the school server and get the
XOs to set their clocks when booted.
You may want/need a cron job to set the time occasionally.
> Casio sells 'atomic' watches that synchronize to Ft. Collins by radio.
> Neat, but how does this work in Rwanda?
WWVB runs at 60 KHz. There are several similar systems in other countries.
I don't think any of them make it to Africa. GPS does.
You can get USB GPS receivers for under $50. The SiRF chip is the most
popular in the low cost units. It's crappy if you need ms level timing, but
good enough if all you need is 1 second.
These are my opinions. I hate spam.
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