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#1001
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Draconian vacation policies for US slave workers
Jim Ley writes:
If they didn't set them accurately (well if they didn't set them all to be the same to a reference clock, the only available reference clock being the GPS clock system) then their network would stop working, accurate clocks are essential for the protocols. Relatively accurate time measurement is required by the protocols I've seen, but the absolute time of day need not be as accurately kept. Why? For what purpose? Why do I need to justify it? It costs no more than wris****ches with much lower accuracy. It has no disadvantages, so why not? -- Transpose mxsmanic and gmail to reach me by e-mail. |
#1002
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Draconian vacation policies for US slave workers
Miguel Cruz writes:
I don't think the service would work without accurate clocks; extremely accurate timekeeping is a key element of the system used to select cells and hand off calls. If it works like GSM, it has to be relatively accurate, but not absolutely accurate with respect to time of day. Yes, I have used NTP to keep my computer's clock accurate for at least 10 years. Which is why its agreement with my cell phone is so confidence-inspiring for me. I've written a program that beeps like the time signal from WWV. It soothes me at night to leave it running. All the hands of all the clocks in my apartment move in lock step, in perfect synchronization with the beeps. Even my watches do that. I can think of a practical use for extremely accurate time, by the way: watching solar eclipses. Totality is often measured in seconds, and if your watch is off, you miss the show. I used GPS timing for the last one I observed. It's nice to hear, by the way, that Windows has finally caught up in this regard. It required widespread, continuous access to the Internet, which is a fairly recent phenomenon for home computers, if not office computers. You may want that, but I don't see why it's important or why 99.99% of people would care. Since it has no disadvantages, why not use it? People buy more quartz watches than mechanical watches, and greater accuracy is part of their motivation. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#1003
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Draconian vacation policies for US slave workers
Mxsmanic wrote:
Miguel Cruz writes: I don't think the service would work without accurate clocks; extremely accurate timekeeping is a key element of the system used to select cells and hand off calls. If it works like GSM, it has to be relatively accurate, but not absolutely accurate with respect to time of day. The most reasonable way to ensure they are relatively accurate is to ensure they are absolutely accurate. I find it hard to believe they would take any other, more complicated approach. You may want that, but I don't see why it's important or why 99.99% of people would care. Since it has no disadvantages, why not use it? For people who are already carrying around a cell phone, a watch has the disadvantage of being another thing to carry/wear. 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 |
#1004
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Draconian vacation policies for US slave workers
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. 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. 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. In summary, for timing of protocols, you don't necessarily need accurate time of day. However, for things like time stamps, and synchronization of events with precision over long periods or distances, time of day can be very useful. One application that illustrates this is live television. In the days when live television was common and nationally broadcast, sometimes studios on one coast would pick up where another left off. If they didn't have their clocks synchronized to within a fraction of a second, either there would be a period of dead air or a period of confusion whenever one location handed off to another. Accurate time of day is important for things like electronic money transfers and stock operations, too. -- Transpose mxsmanic and gmail to reach me by e-mail. |
#1005
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Draconian vacation policies for US slave workers
On Mon, 14 Aug 2006 00:19:53 +0200, Mxsmanic
wrote: Jim Ley writes: How does a chain make you remember to transfer it between clothes, or remember to have it with you? When you put the clothing on, it's there. When you take it off, you can feel it dangling around. Pocket watches are heavier than wris****ches. What happens to it in the intervening 8 hours whilst you're sleeping, and how does feeling it dangling around 8 hours before remind you to transfer it to the new clothes the next morning. I concede it may not be an issue if you only have one set of clothes, although rembering to remove it whilst you walk through a public carwash to get clean might be another problem. Jim. |
#1006
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Draconian vacation policies for US slave workers
On Mon, 14 Aug 2006 00:28:06 +0200, Mxsmanic
wrote: Jim Ley writes: How do you update it for leap-seconds? The radio signals to which it synchronizes cover leap years, leap seconds, and daylight saving time. No manual adjustment is ever necessary. In any case, your watch is not accurate to what you claimed, as there is more inaccuracy in the radio tranmission than your quoted figure, there is also reportedly more accuracy with a GPS system. So a GPS connection would be more reliable, so a CDMA phone would be more accurate. It's not a function of the phone, it's a function of the network - anything that is CDMA based or the majority of the 3G methods (AIUI) have clocks synchronised with the base-station, which are GPS sync'd. Which _can_ be GPS synchronized. No all CDMA systems are, there's no other available clocks. GSM (the standard used everywhere else in the world) provides for time synchronization, Oops, have you not heard of 3G roll outs, GSM is not as ubiquitous as it was - although they roll over to it obviously. Jim. |
#1007
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Draconian vacation policies for US slave workers
On Mon, 14 Aug 2006 00:30:06 +0200, Mxsmanic
wrote: Relatively accurate time measurement is required by the protocols I've seen, but the absolute time of day need not be as accurately kept. no, obviously it does not need to be absolutely accurate (they could all synchronise to 3 weeks ago last tuesday) however there are few sources of accurate clocks you can synchronise base stations too other than GPS signals, which are highly accurate atomic clock signals giving the correct time. So they all have the right time. Why? For what purpose? Why do I need to justify it? because you're suggesting your experience would be relevant beyond yourself, because of that, justification is kind of important. Jim. |
#1008
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Draconian vacation policies for US slave workers
Mxsmanic wrote:
JohnT writes: You would only be able to verify that claim if you measured the time errors over 3 million years. Not even you could do that. You can measure the error over one day and extrapolate. So, you have the ability to measure the error for one day and extrapolate over 3 million years, meaning you have measured the daily error, and found it to be less than 1 billionth of a second off? |
#1009
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Draconian vacation policies for US slave workers
Dave Frightens Me wrote: On 10 Aug 2006 18:01:31 -0700, "Tchiowa" wrote: Utter rubbish. These people are no more likely to have links with Al Qaeda and the Taliban than anyone else. They were just rounded up so the USA could have some spoils. And your proof of that? They are being deprived due process only because many of them would be found to have done nothing. And your proof of *that*??? Just read the ****ing article and educate yourself. They have been assumed guilty, and have no way of proving otherwise. In other words you have to proof and you are willing to believe any slanted article you can find. Can you spell "gullible"? |
#1010
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Draconian vacation policies for US slave workers
Mxsmanic wrote: Tchiowa writes: That's because property can't commit a crime. But the civil forfeiture is a result of the criminal conduct. And it all has to be approved by a judge. Criminal conduct is decided by a jury, not a judge. Wrong. Criminal conduct may be decided by a judge if parties approve. And civil forfeiture occurs before anything is proved by anyone. Wrong again. The process can be started immediately but it must be approved by a judge to be final and anyone can challenge and appeal in court. Therefore, no due process. 3 times wrong in 2 sentences. Not bad. |
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