Precision Time Protocol (PTP) and Transparent Clock Feature Overview and Configuration Guide

Precision Time Protocol (PTP) is an Ethernet or IP-based protocol for synchronizing time clocks on a collection of network devices using a Transmitter/Receiver distribution mechanism.

PTP is used for applications that require very high precision timing using Ethernet or Ethernet/IP. For example, Telco applications such as cellular, where not only frequency, but also phase precision is needed in order to control hand-off of mobile phones from one cell tower to the next.

The Transparent Clock feature is used by bridges or routers to assist clocks in measuring and adjusting for packet delay. The transparent clock computes the variable delay as the PTP packets pass through the switch or the router.

This guide describes how AlliedWare Plus uses PTP and the Transparent Clock in an IEEE 1588 network, and supports:

  • End-to-End delay mechanism
  • 1-Step based time stamping mode