Boundary Clock

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IEEE 1588: What’s the difference between a Boundary Clock and Transparent Clock?

IEEE 1588 2002

  • Original standard
  • Ordinary Clock : GrandMaster of Slave. Always a single port
  • Boundary Clock
    • clock node that has two or more ports (router or switch)
    • One port as a slave clock,
    • The remaining ports are master clock for other nodes.
    • BC recovers the time of day within the slave clock and relays it as a reference to the mater clock function

1PPS

Holdover time

  • Time to maintain the accuracy during the GPS is not locked

OXCO vs. TCXO