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`timemaster(8)` man page — Describes a program that uses [application]*ptp4l* and [application]*phc2sys* to synchronize the system clock using `chronyd` or `ntpd`.
Useful Websites
link:++http://linuxptp.sourceforge.net/++[]
The Linux PTP project.
link:++http://www.nist.gov/el/isd/ieee/ieee1588.cfm++[]
The IEEE 1588 Standard.