This European Telecommunication Standard (ETS) specifies the network specific aspects of the frame relay service when it is offered on a network to provide the frame relay data transmission service.
DS/ETS 300399-3:1996 history
2013DS/EN ISO 4126-5:2013 Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS)
1996DS/ETS 300399-3:1996 Frame relay services - Part 3: Frame relay data transmission service - Service definition