What is changing in the IEEE1588 Revision?


This is not a new version!!!!

  • This is not IEEE1588 v3, it is v2.1
  • Everything that works with IEEE1588-2008 today will work IEEE1588 v2.1

IEEE1588-2018 will be a set of new, optional features asked for by particular industry groups:

  • Slave Event Monitoring
  • Special Ports
  • Mixed Multicast/Unicast Operation
  • Modular Transparent Clock
  • Security
  • Inter-domain interactions
  • Profile Isolation
  • High accuracy features (based on White Rabbit from CERN)

Slave Timing Measurement

Provides a way of monitoring the status and time at a slave clock

  • Useful for slaves that have no separate timing output

Slave reports a TLV containing the timing of event messages relative to the slave local clock time

Special Ports

Interfaces PTP to timing ports on other technologies

  • Examples: 1pps/ToD, Microwave, WiFi, EPON

Note: Diagram taken from Doug Arnold's presentation at ITSF 2017 (Meinberg)

Other Interesting Features

Mixed Multicast/Unicast Operation

  • Sync, Announce messages are multicast
  • Delay_Request, Delay_Response are unicast

Modular Transparent Clocks

  • Separate “ingress” and “egress” TCs, e.g. built into SFP modules

Security TLV

  • Uses PTP over IPsec and MACsec
  • Security TLV can be attached to any PTP message
  • Key exchange details outside the scope of IEEE1588

Inter-domain Interaction

  • Allows creation of robust synchronization networks by using three or four separate clock domains

High Accuracy PTP

  • Based on CERN’s “White Rabbit” extensions to PTP
  • Achieves sub-ns phase synchronisation over a LAN
  • Couples the physical-layer clock with the PTP flow
  • Manually configured port states
  • Requires link asymmetry calibration using a “Golden Calibrator”
  • Not scalable to wide-area or telecom networks