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同步复用和映射方法是SDH最具特色的内容之一，2．048Mbit／s支路信号复用映射进入STM－1帧是欧洲体制的SDH（如我国所采用的体制）最基本的工作过程。本文系统分析2．048Mbit／s支路信号复用映射进入STM－1帧的过程。
Synchronous multiplexing and mapping methods are one of the most distinctive contents of SDH. The multiplexing of 2.048 Mbit / s tributary signals into the STM-1 frame is the most basic working process of the SDH of the European system (as adopted by China) . This article systematically analyzes 2.048Mbit / s branch signal multiplexing mapping into the STM-1 frame process.