摘要
对ＳＤＨ体系中的２．０４８Ｍｂｉｔ／ｓ支路信号异步映射进ＶＣ－１２的具体过程进行了分析。主要进行了正／零／负码速调整的参数设计，包括通过读写时差的变化来确定缓冲存储容量和上、下门限；并给出了码速调整。
In this paper,we analyzed the asynchronous mapping of 2.048 Mbit/s tributary into SDH VC 12 and showed the major function blocks.It include two parts:positive/zero/negative justification and 500 μs VC 12 multiframe generator.We mainly analyzed the features of adapting PDH 2.048 Mbit/s tributary into SDH C 12 by using positive/zero/negative justification.We got relative optimized parameter: the capacity of elastic store,up threshold,and dowm theshold.At the same time,we designed a coder to get the time sequences we need to structure 500 μs VC 12 multiframe.
出处
《光通信研究》
1996年第2期21-27,共7页
Study on Optical Communications
