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by Kenjiro Cho #07 11/28/2002

NTP system model

• clock filter
  
  
  • temporally smooth estimates from a given peer
    
    
• clock selection
  
  
  • select subset of mutually agreeing clocks
    
    
  • intersection algorithm: eliminate outliers
    
    
  • clustering: pick good estimates
    
    
• clock combining
  
  
  • combine into a single estimate