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isw

In article ,
(Dave Platt) wrote:

In article ],
isw wrote:

Functionally impossible. By adding money, you can reduce the drift rate
but you can't make it zero. Period. Just use NTP.

Or, if you prefer something stand-alone which will give you a good time
reference if your network connection is down: use GPS.

Except I don't see how you can call something that *must* receive radio
signals all the time "stand alone" (I guess you could say that it's on a
"wireless network"). And of course, GPS time is ultimately synchronized
to that same aggregation of stratum 0 clocks as all the other servers
we've been talking about.

That said, GPS is a very good way to distribute precision time. You can
see 4-inch mushroom-shaped things on top of buildings at the base of
cellphone towers all over the place; they're GPS receivers (often two
for redundancy) used for getting the signals timed properly before
injecting them into the telco network.

Isaac