Dear Danny;
On Oct 25, 2008, at 9:11 PM, Danny Mayer wrote:
Roger Sundman wrote:
Hi all,
There is a need for traceable time in the financial market and
there is a
(coming?) directive from the EC comission for traceable time for
use in cash
registers. Seismic exploration, military and transportation is
some other
applications.
Best regards
Roger
This is really a meaningless answer. What accuracy is needed and why?
What if you don't get it? What it the jitter is too large? What is too
large for each of these applications. Does the financial market need
to
have accuracy to minutes, seconds, milliseconds? Ditto for the other
applications. For all we know NTP as it is today is good enough.
I worked in timing and with timing for 20 years and we would almost
never get answers to those questions either.
The reason, I think, is twofold : Most people outside the timing
community don't understand the issues, and
people are afraid that stating a requirement would result in a bill or
in a line of attack (if they don't pay that bill).
In fact, as a rule of thumb the stronger the timing requirement
statement is the more likely it comes from what the timing community
has stated it can do.
So, what is generally done, and what I would urge here, is to
- figure out what accuracy is realistic (in this case, how good we
realistically can do with router assistance) and
- make that the goal and
- figure out what benefits that might bring.
Regards
Marshall
Danny
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