NTP Design Stratum Numbers – Kerry Cordero
Seven best practices to keep your NTP resilient – BlueCat Networks
Wiring the ESP8266 12/12E as NTP Network Time Protocol via UDP as Stand Alone | 14core.com
Stratum Levels & NTP Explained | The 'Stratumopshere' Guide
Introducing time.cloudflare.com
Network Time Protocol - Wikipedia
What is Stratum 1? | EndRun Technologies
Stratum 1 Raspberry Pi Time Server – My Wushu Blog
Using NTP for Time Settings - NIOS Admin Guide - Infoblox Documentation Portal
NTP hierarchy
Time in Distributed Systems - by Siddharth Sarda
Stratum-1 GPS referenced NTP Server in a Compact Enclosure. Replaces SC7105. - Precision Timing, Network Timing Servers - pd - Step Global
NTP Basics | mrn-cciew
Network Time Protocol (NTP) Best Practices | TimeTools Ltd
About Time
Arduino-based Stratum-1 NTP Server
Network Time Protocol | NTP Overview | NTP Configuration
NTP Time Server to Accurately Sync Your Network | EndRun
Network Time Server Guidance
NTP architecture
Understanding Stratum Levels - everything RF
Use Best Practices for Network Time Protocol - Cisco
Using NTP for Time Settings - NIOS Admin Guide - Infoblox Documentation Portal
Aaron Toponce : Real Life NTP
