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Draconian vacation policies for US slave workers
Mxsmanic wrote:
Miguel Cruz writes: The most reasonable way to ensure they are relatively accurate is to ensure they are absolutely accurate. Not necessarily. It may be cheaper to provide very stable time references for the network for relative measurement rather than try to derive those measures from an ultra-accurate time-of-day source. This is especially true since the accuracy required might be microseconds or better, and this is expensive to derive from the time of day. If you know where you are then you can synchronize with microsecond accuracy against other devices that also know where they are, using freely-available time-of-day sources. On the other hand, synchronizing in any other way would be more complicated and expensive. I do not see any reason to believe cellular phone companies would spend more money and effort just to prove you right. For example, most time of day sources provide extremely high long-term accuracy at low cost, but they provide poor short-term accuracy unless a great deal of effort and money is expended. Hint: Cell towers are not using NTP. A radio source will keep your network locked to the correct time of day with long-term accuracy equal to that of the best atomic clocks, but the short-term accuracy may be off by hundreds of milliseconds per day unless you spend a great deal on either continuous synchronization or a local reference that is extremely accurate when free-running. In the latter case, you might as well skip the time-of-day reference. No, because the point is to get the clocks at multiple locations synchronized with each other. [ boring crap that everyone knows and has nothing to do with the issue omitted ] miguel -- Photos from 40 countries on 5 continents: http://travel.u.nu Latest photos: Malaysia; Thailand; Singapore; Spain; Morocco Airports of the world: http://airport.u.nu |
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