[LEAPSECS] rubber seconds in Japan!
M. Warner Losh
imp at bsdimp.com
Mon Dec 29 15:12:25 EST 2008
In message: <20081229200904.GQ2263 at fysh.org>
Zefram <zefram at fysh.org> writes:
: Steve Allen wrote:
: >100 of them, just before the leap
: This is essentially the same technique as Markus Kuhn's UTC-SLS (UTC
: with Smoothed Leap Seconds), but over a shorter period. One might well
: suppose that if they'd heard of UTC-SLS then they'd have used it, and so
: this is probably an independent invention. Presumably they're working
: with the same objective: to provide a timescale that usually matches UTC
: exactly but also does not violate the fixed 60-seconds-per-minute model.
: Interesting that they're only doing that for some users (those connecting
: by copper, apparently). Users connecting by fibre get a visible (well,
: audible) leap. Assumptions about the precision required by different
: classes of user?
I imagine that the fiber folks derive their clock from the fiber
carrier frequency, which can't be off by 1e-2. The usual specs for
those start closer to 1e-12...
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