Reference Clocks
A reference clock is usually a very accurate time device like an atomic clock or a GPS clock.
Reference clocks are stratum 0 within the NTP hierarchy.
NTP servers directly connected to reference clocks are stratum 1.

Last updated
A reference clock is usually a very accurate time device like an atomic clock or a GPS clock.
Reference clocks are stratum 0 within the NTP hierarchy.
NTP servers directly connected to reference clocks are stratum 1.
Last updated