This article introduces in detail the basic principle of SDH,summarizing its advantages over PDH technology,finally emphatically describes its application cases in urban grids in Nanchang area.

• 详细介绍了SDH技术的基本原理,总结了SDH技术相比于光纤通信线路(PDH)技术的几大优点,阐述了SDH技术在南昌地区电力城域网中的应用方案。