摘要
在IP/TDM网关出口重建TDM业务定时是TDMoIP(TDM-over-IP)应用的关键技术之一。本文介绍了自适应时钟恢复方法的背景和原理,给出了一种基于包间隔的自适应定时恢复方案的算法设计与实现,描述了硬件实现的模块划分与关键算法实现,最后给出了测试结果。测试结果表明,锁定状态下频率准确度和稳定度均能达到较高指标。
Reconstruction of TDM service clock at the IP/TDM gateway in application of TDM-over-IP is one of the key technologies. This paper introduces the backgrounds and principle of adaptive clock recovery, presents an implementation of the adaptive clock recovery method based on packet arrival intervals, describes function module arrangement and key algorithm implementation. Finally, the experimental results are provided. The results showed that both of frequency accuracy and stability can reach a high level in the locked mode.
出处
《微计算机信息》
北大核心
2007年第02X期94-95,101,共3页
Control & Automation
基金
国家自然科学基金(90407011)
关键词
包交换网络
电路仿真
自适应定时恢复
packet switched network,circuit emulation, adaptive clock recovery
