This paper introduces the principles of unified switching and the key technologies for its implementation

including the cell switching technology and Segmentation And Reassembly（SAR）technology

gives the function block diagrams of the unified switching equipments and describes such issues to be considered in the design as switching efficiency

latency

redundant protection of the switching boards and switching capacity calculation.The results in this paper have been applied to optical transmission equipments with good effects.This technology has obvious technical superiority and it will be one of the key technologies for the next generation telecommunication networks.