RFC 957 (rfc957) - Page 1 of 27

Experiments in network clock synchronization

Alternative Format: Original Text Document

Network Working Group                                         D.L. Mills
Request for Comments: 957                               M/A-COM Linkabit
                                                          September 1985

              Experiments in Network Clock Synchronization


Status of this Memo

   This RFC discusses some experiments in clock synchronization in the
   ARPA-Internet community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Table of Contents

   1.      Introduction
   2.      Design of the Synchronization Algorithm
   2.1.    The Logical Clock
   2.2.    Linear Phase Adjustments
   2.3.    Nonlinear Phase Adjustments
   3.      Synchronizing Network Clocks
   3.1.    Reference Clocks and Reference Hosts
   3.2.    Distribution of Timing Information
   4.      Experimental Validation of the Design
   4.1.    Experiment Design
   4.2.    Experiment Execution
   4.3.    Discussion of Results
   4.3.1.  On Power-Grid Clocks
   4.3.2.  On Clocks Synchronized via Network Links
   4.3.3.  On the Accuracy of Radio Clocks
   4.3.3.1. The Spectracom 8170 WWVB Radio Clock
   4.3.3.2. The True Time 468-DC GOES Radio Clock
   4.3.3.3. The Heath GC-1000 WWV Radio Clock
   4.3.4.  On Handling Disruptions
   4.4.    Additional Experiments
   5.      Summary and Conclusions
   6.      References

List of Figures

   Figure 1. Clock Registers
   Figure 2. Network Configuration











Mills

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