ZTE

ZTE Communications ›› 2010, Vol. 8 ›› Issue (3): 27-31.

• Special Topic • Previous Articles     Next Articles

PTN Clock Synchronization Technology and Its Applications

Li Qin   

  1. ZTE Corporation, Shenzhen 518055, P. R. China
  • Online:2010-09-25 Published:2020-02-28
  • About author:Li Qin received his master’s degree from Beijing University of Posts and Telecommunications. He is a PTN solution manager at the Bearer Network Planning System Department of ZTE, and is mainly engaged in the study of 3G/LTE PTN bearer solutions.

PTN Clock Synchronization Technology and Its Applications

Li Qin   

  1. ZTE Corporation, Shenzhen 518055, P. R. China
  • 作者简介:Li Qin received his master’s degree from Beijing University of Posts and Telecommunications. He is a PTN solution manager at the Bearer Network Planning System Department of ZTE, and is mainly engaged in the study of 3G/LTE PTN bearer solutions.

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Abstract: Clock synchronization is an important issue for packet transport networking. Current clock synchronization technologies include synchronous Ethernet, IEEE 1588v2, and Network Time Protocol (NTP). However, individually, these technologies are beset with certain problems. Synchronization Status Message (SSM) algorithm for synchronous Ethernet standards suffers clock ring, and has difficulty tracing and counting nodes. An extended SSM algorithm can improve clock synchronization. NTP is too imprecise to meet the requirements of telecom networks, yet IEEE 1588v2 alone can lead to slow convergence time and influence time delay precision when the network is heavily loaded. ZTE therefore proposes an IEEE 1588v2 solution based on synchronous Ethernet in order to effectively raise the precision of Packet Transport Network (PTN) time synchronization.

摘要： Clock synchronization is an important issue for packet transport networking. Current clock synchronization technologies include synchronous Ethernet, IEEE 1588v2, and Network Time Protocol (NTP). However, individually, these technologies are beset with certain problems. Synchronization Status Message (SSM) algorithm for synchronous Ethernet standards suffers clock ring, and has difficulty tracing and counting nodes. An extended SSM algorithm can improve clock synchronization. NTP is too imprecise to meet the requirements of telecom networks, yet IEEE 1588v2 alone can lead to slow convergence time and influence time delay precision when the network is heavily loaded. ZTE therefore proposes an IEEE 1588v2 solution based on synchronous Ethernet in order to effectively raise the precision of Packet Transport Network (PTN) time synchronization.