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What does reference clock unit number mean in NTP?

I'm confused with NTP's reference clock unit number. I tried to find its meaning on ntp.org, but only found that its range is from 0-3 (defined in 127.127.t.u). What is the actual meaning of reference clock unit number?

Solution

  • From the documentation

    u is a unit number in the range 0-3 used to distinguish multiple instances of clocks of the same type.