Time synchronization — NTP and PTP sources¶

Reference and project material on NTP vs PTP, IEEE 1588 profiles, hardware timestamping expectations, GNSS-disciplined lab/edge clocks, a DIY Raspberry Pi grandmaster (Time Pi) repo, Raspberry Shake-style NTP operational notes, and forum threads on GNSS HATs and stratum-1 builds.

This hub focuses on distributing and disciplining time over IP/Ethernet. For where time and positioning come from when GNSS is contested or complemented (e.g. broadcast timing, LORAN history, non-GPS trackers), see Position, navigation, and timing alternatives—linked below.

Concepts

• Network Time Protocol (NTP)
• Precision Time Protocol (PTP)

Source notes

• source-notes/network-time-protocol-wikipedia.md
• source-notes/precision-time-protocol-wikipedia.md
• source-notes/precision-time-protocol-explained-networklessons.md
• source-notes/diy-ptp-grandmaster-pi-geerling.md
• source-notes/raspberry-pi-5-ptp-timestamping-forums.md
• source-notes/geerlingguy-time-pi-ansible-configuration.md
• source-notes/ntp-and-gps-timing-raspberry-shake.md
• source-notes/gps-controlled-clock-raspberry-pi-engineering-radio.md
• source-notes/gnss-hat-setting-time-raspberry-pi-forums.md
• source-notes/timeserver-with-gnss-receiver-raspberry-pi-forums.md
• source-notes/nist-internet-time-service-servers.md

Related topics

• Position, navigation, and timing alternatives — BPS/LORAN/non-GPS tracker framing
• Timing on the farm — synthesis — How clock sync fits alongside seasonal and labor timing on-farm