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GPS master & slave clocks

A GPS master clock is an electronic device that provides time synchronization signals to a number of slave clocks on a network. Typically, the master time clock maintains accurate time from a hardware clock source, such as GPS, GLONASS, Galileo or other sources of precise time.

A slave clock is a hardware device that typically depends on a master clock to for accurate time. A number of slave clocks synchronize with a master clock to provide a display of accurate time.

Slave clocks typically communicate on a clock network. The clock network can either be a simple wired serial network, a wired pulse signal or a more complex Ethernet network.