This article analyzed the differences between electronic transformer and traditional transformer in secondary output port

put forward several doable transitional interfacing methods in the transitional period from old to new standard.According to signal input and disposal process presently performed in our country

two connecting methods was discussed emphatically:①analog connecting method based on "medium voltage";②point to point merge digital communication interfacing method based on inhere A/D port.This article also introduced the concept about "digital transform ratio" in new standard

provided practice application effect of transition interfacing methods.