Chapter 3 Network Architeture and standarts V, standards define the connection of digital equipment to the PSTN s analog lines V.32, V.33, V42 standard for the use of telephone transmission of data made a clear statement X standards Define the connection of digital equipment to digital lines EGX25,X400.X.500 network Management and operation www.gxmu.edu.cnNetwork Management and Operation www.gxmu.edu.cn V.standards : define the connection of digital equipment to the PSTN`s analog lines V.32, V.33, V.42 standard for the use of telephone transmission of data made a clear statement . X.standards: Define the connection of digital equipment to digital lines. E.G X.25, X.400, X.500 Chapter 3 Network Architetures and Standarts