精确时钟同步协议分析及实现

测量和控制工程正在越来越多地使用网络通讯、本地化计算、分布式设备等分布式系统技术。IEEE 1588(PTP)利用以太网或其他支持多播技术的网络使终端设备同步,最高精度可以达到亚微秒级。可以很好的支持测量和控制应用。针对IEEE 1588协议的以太网应用,对协议进行了分析,研究了IEEE 1588协议的优点和核心算法以及漂移测量和延迟测量。针对IEEE 1588的3种实现方式:软件实现、硬件实现、软件和硬件结合实现,研究了3种方式的优缺点。

Implementation of QoS in EPON System

Measurement and control applications are increasingly using distributed system technologies such as network communi- cation, local computing, and distributed objects. IEEE 1588 （PTP） using Ethernet or other network which support multicast technol- ogy to synchronize the terminal equipment, the most you can achieve sub-microsecond precision. IEEE 1588 Can be well supported measurement and control applications. The paper firstly make an analysis for the application of IEEE 1588 in Ethemet, then make a introduction about the advantage of IEEE 1588 and the core algorithm： Drift measurement and Delay measurement. At last, the pa- per introduce three ways to implement IEEE 1588： pure software to realize ; pure hardware to realize; software and hardware to realize together. And compare the advantage and disadvantage of each way.