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19.12. Additional Resources
The following sources of information provide additional resources regarding
PTP and the ptp4l tools.
19.12.1. Installed Documentation
ptp4l(8)man page — Describes ptp4l options including the format of the configuration file.pmc(8)man page — Describes thePTPmanagement client and its command options.phc2sys(8)man page — Describes a tool for synchronizing the system clock to aPTPhardware clock (PHC).timemaster(8)man page — Describes a program that uses ptp4l and phc2sys to synchronize the system clock usingchronydorntpd.
19.12.2. Useful Websites
- http://www.nist.gov/el/isd/ieee/ieee1588.cfm
- The IEEE 1588 Standard.

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