This ETS specifies the data syntax to be used by Videotex services for implementation of the Videotex Enhanced Man Machine Interface (VEMMI). This ETS is applicable to both the Videotex service and the attached Videotex terminals. Those terminals may be connected to the Videotex service via the Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN) or Packet Switched Public Data Network (PSPDN). Typically, the terminals should support ISDN SBV.