sfptpd 2-Stage Synchronization

Enhanced PTP User Guide (UG1602)

Document ID
UG1602
Release Date
2022-10-18
Revision
1.0 English

The PTP messages are used by sfptpd to synchronize the adapter clock with the master clock. sfptpd runs a second clock servo to synchronize the system clock to the adapter clock as illustrated by Figure 1. This unique two stage synchronization has a number of benefits including:

  • Improved accuracy with the ability to more frequently discipline the system clock than is supported by standard PTP masters.
  • Ability to discipline the system clock to a high precision clock during periods, for whatever reason, whereby the upstream PTP master is inaccessible or offline.
    Figure 1. sfptpd 2-stage Synchronization