Overview of G.8275.1

Concepts of G.8275.1

ITU-T G.8275.1 defines the precision time protocol telecom profile for phase/time synchronization with full timing support from the network. G.8275.1 is defined as a time synchronization protocol.

A physical network can be logically divided into multiple clock domains. Each clock domain has its own independent synchronous time, with which clocks in the same domain synchronize.

A node on a time synchronization network is called a clock. G.8275.1 defines three types of clocks:

A Telecom grandmaster (T-GM) can only be the master clock that provides time synchronization.
A Telecom-boundary clock (T-BC) has more than one G.8275.1 interface. One interface of the T-BC synchronizes time signals with an upstream clock, and the other interfaces distribute the time signals to downstream clocks.
A Telecom-transparent clock (T-TC) has more than one G.8275.1 interface through which the T-TC forwards G.8275.1 packets, and corrects the packet transmission delay. A T-TC does not synchronize the time through any of these G.8275.1 interfaces.
A Telecom time slave clock (T-TSC) can only be the slave clock that synchronizes the time information of the upstream device.

The NetEngine 8000 F can function as the T-BC and T-TC only.