ETSI TS 100 602 Digital cellular telecommunications system (Phase 2+) (GSM); Interworking between the Public Land Mobile Network (PLMN) and the Packet Switched Public Data Network (PSPDN) for Packet Assembly/Disassembly (PAD) facility access (GSM 09.05 version 7.0.0 Release 1998)

standard by European Telecommunications Standards Institute, 08/01/1999