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NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management
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Overview of CU-106

Overview of CU-106

Concepts of CU-106

ITU-T CU-106 defines the precision time protocol telecom profile for phase/time synchronization with full timing support from the network. CU-106 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. CU-106 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 CU-106 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 time slave clock (T-TSC) can only be the slave clock that synchronizes the time information of the upstream device.

Figure 10-1 shows the locations of the three types of clocks on a time synchronization network.

Figure 10-1 Locations of the three types of clocks on a time synchronization network.

Two Delay Measurement Mechanisms Supported by the NE40E

A delay request-response mechanism, in which information about the clock and time is calculated according to the delay of the entire link between the master clock and slave clock.

BMC Algorithm and Static Clock Source Selection Supported by the NE40E

On a CU-106 time synchronization network, all clocks are organized into a master-slave synchronization hierarchy with the Grandmaster (GM) clock at the top. This topology can be automatically generated by CU-106 using the Best Master Clock (BMC) algorithm.

Updated: 2019-01-02

Document ID: EDOC1100058392

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