The exchange networkofpower enterprise mainly uses circuit switching equipment

but with the development of technology

circuit switching equipment has been discontinued

so the network expansion and maintenance is increasingly difficult. At the same time

with increasing demand for information and communication

theexchange network based on circuit-switched technology has been unable to meet the requirements

soit is inevitable to migrate to next-generation switching network. According to the status of exchange network

this paper discusses key technologies and Strategies for next-generation switching network migration and evolution

including the next-generation network technology system selection

user access technology

service migration

the migration of user number

network interworking strategies.