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ATM技术很好地解决了数据的透明传送问题，但定时信息在ATM网中的传递透明性由于统计复用而受到损害目前用于电路仿真业务的定时恢复方法根据是否使用公共时钟大致分为同步和异步两种模式由于SDH网的推广，同步方式已被ITU－T采用主要有SFET（SyncthenousFrequencyEncodingTechniqu）、TS（TimeStamp）和SRTS（SynchronousResidualTimeStamp）三种．由于ATM业务的多样性，它们最大都有可能引入IUI的低频抖动本文提出了一种改进方法，首次将2级量化理论应用于定时恢复，可使任何业务的定时低频抖动降低到0．02UI以下，从而极大地提高了定时恢复的质量
ATM technology solves the problem of transparent transmission of data well, but the transmission transparency of timing information in the ATM network is impaired due to statistical multiplexing. The current timing recovery method for circuit simulation services is roughly divided into two types according to whether the common clock is used: synchronization And Asynchronous Two Modes As a result of the promotion of SDH network, the synchronization mode has been mainly adopted by the ITU-T with three types: Synchronous Frequency Encoding Technology (TSET), TS (TimeStamp) and SRTS (SynchronousResidualTimeStamp). Due to the diversity of ATM services, they are likely to introduce low-frequency jitter of IUI most. In this paper, an improved method is proposed in this paper. For the first time, the application of 2-level quantization theory to timing recovery can reduce the timing jitter of any service to below 0.02UI , Thus greatly improving the quality of timing recovery