[LEAPSECS] Crunching Bulletin B numbers

[Gerard Ashton]

On 2/19/2011 10:24 AM, Joe Gwinn wrote, in part:

> I have not been following the proposal in detail, but a key issue to 

> the POSIX community is that their timescale must be implementable in a 

> totally isolated machine, one having no GPS or internet access.

>

> There are other requirements as well.  This was discussed at length on 

> the Time Nuts reflector, until Tom kicked the thread over to Leap Secs.

>

> Joe Gwinn

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I think a description of the totally isolated machine requirement would 
have to be specified
to make progress. How long would the machine be expected to keep good 
time, what is the acceptable
tolerance for time of day, and what technology would be used to keep 
time? What is the application
of the resulting time scale. For example, if the application is time 
stamping stock exchange transactions
with the local legal time with a tolerance of 1 second, and the 
technology is the crystal oscillator provided
by the manufacturer of a commodity PC, that just won't work unless the 
period of isolation is about
an hour.

Gerry Ashton