GPON作为移动通信的基站回传方案需要支持高精度的时间同步, 本文首先简单介绍了IEEE 1588v2协议基本机制,然后分析了在GPON系统中实现1588的几大难点,并介绍了烽火GPON特殊系统框架下的时间同步实现方案架构,给出了可靠的测试数据,最后针对GPON系统时间同步还存在的问题提出了针对性的建议.%As the solution of wireless backhaul, GPON has to support high accuracy time synchronization. This paper briefly introduces the basic mechanism of IEEE 1588v2 protocol firstly. Secondly, it analyzes several major difficulties of realizing 1588 in GPON system. Then it describes the time synchronization implementation schema of Fiberhome's special GPON system frame, and provides reliable experimental data. At last, this paper makes specific recommendations for existence problem of time synchronization in GPON system.
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