Electronic data interchange for administration,commerce and transport(EDIFACT)—Application level syntax rules(Syntax version number:4)—Part 7:Security rules for batch EDI(Confidentiality)
General arrangements for interworking between packet switched public data networks (PSPDN) and circuit switched public data networks (CSPDN) for the provision of data transmission services
Interface betweendata terminal equipment(DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and accessing a packet switched public data network through a public switched telephone network or an integrated service