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An Improvement Method to the Timing Recovery for ATM Circuit Emulation

Ge Ning;Cong Yonghua and FengChongxi(Communication Division.Department of Electronic Engineering Tsinghua University Bei-jing,100084)  
ATM can support various services in a universal format. The transport of CBR services is an important feature of ATM, and is referred to as circnit emulation .The recovery of soaree clock hequency is one of the critical issues due to packet oriented technology. There are two classes of generic approaches to ATM timing recovery, namely, non-syncbonous methods and syncbonous methods. SFET, TS and SRTS are three main synchronous methods,among them SRTh has been accepted by ITU-T as the timing recovery standard for AALl.However it will introduce up to lUI waiting time jitter at some values of souree clock frequency. An improvement method, namely Synchronous Filtered Residual Time Stamp(SFRTh), is proposed in this paper. It is based on 2-stage Sigma-Delta quantization and reduces the waiting time jitter below 0.02UI so that it greaily improves timing quality in ATM.
【CateGory Index】: TN915
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Chinese Journal Full-text Database 1 Hits
1 XU Xiao dong, JING Ya, GUO Jun neng (Research Institute of Broadband Network Technology, CUPT,Chongqing 400065,China);MPEG-2 Traffic Transport over ATM Network[J];Journal of Chongqing University of Posts and Telecommunications;2001-04
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