NTP time server and the Time Reference

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• Choosing GPS or MSF as a Timing Reference for NTP Servers All PC’s and networking devices use clocks to maintain an internal system time. These clocks, called Real Time Clock chips (RTC), provide time and date information. They are battery backed so that even during power outages, they can maintain time. However, personal computers are not designed to be perfect clocks - their design has been optimized for mass production and low-cost rather than maintaining an accurate time. These internal clocks are prone to drift and although for many application this is can be quite adequate for some applications, but machines on a network that drift at different rates, become out of ...
  
  
• Using Atomic Clocks as External NTP Timing References Atomic Clocks have been around for over fifty years or so. They are clocks that use an atomic resonance frequency as its timekeeping element rather than conventional oscillating crystals such as quartz. Most atomic clocks use the resonance of the atom caesium-133 which resonates at an exact frequency of 9,192,631,770 every second. Since 1967 the International System of Units (SI) has defined the second as that number of cycles from caesium -133 which makes atomic clocks (sometimes called caesium oscillators) the standard for time measurements. Because the resonance of the caesium-133 atom is so precise, this makes atomic clocks accurate to less ...
  
  
• Timing is Everything – NTP and the Importance of Accurate Network Time Synchronisation On occasion we all need to know the time and we have a multitude of different devices to tell us it; from our mobile phones and wrist watches to the office wall clock or the chimes on the radio news. But how accurate are all these clocks and does it matter if they are all telling different times? For our day-to-day business it probably doesn’t matter too much if the office wall clock is faster than your wrist-watch your boss probably won’t fire you for being a minute late. But in some environments accuracy and synchronisation are vital where a minute can ...
  
  
• NTP Server and the Atomic Clock Many network administrators boast that there networks are perfectly synchronised because they have an atomic clock as an NTP server. In actual fact as atomic clocks cost several millions of pounds and are quite vast in size it is doubtful the average server room contains such a timepiece. What in fact they are referring to is that they have an NTP server that receives a timing source from an atomic clock. However, just because atomic clocks are the most accurate chronometers in the world, accurate to a few nanoseconds (billionth of a second) it doesn’t necessarily mean that a network using ...
  
  
• NTP Servers and Atomic Clocks Many network administrators boast that there networks are perfectly synchronised because they have an atomic clock as an NTP server. In actual fact as atomic clocks cost several millions of pounds and are quite vast in size it is doubtful the average server room contains such a timepiece. What in fact they are referring to is that they have an NTP server that receives a timing source from an atomic clock. However, just because atomic clocks are the most accurate chronometers in the world, accurate to a few nanoseconds (billionth of a second) it doesn’t necessarily mean that a network using ...