2 Normative references

04.223GPPTS

This ETS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.

[1] GSM 01.04 (ETR 350): "Digital cellular telecommunication system (Phase 2+); Abbreviations and acronyms".

[2] GSM 04.21 (ETS 300 945): "Digital cellular telecommunication system; Rate adaption on the Mobile Station – Base Station System (MS – BSS) interface".

[3] GSM 07.02 (ETS 300 914): "Digital cellular telecommunication system (Phase 2+); Terminal Adaptation Functions (TAF) for services using asynchronous bearer capabilities".

[4] GSM 07.03 (ETS 300 584): "Digital cellular telecommunication system (Phase 2); Terminal Adaptation Functions (TAF) for services using synchronous bearer capabilities".

[5] GSM 09.04: "Digital cellular telecommunication system; Interworking between the Public Land Mobile Network (PLMN) and the Circuit Switched Public Data Network (CSPDN)".

[6] GSM 09.05: "Digital cellular telecommunication system; Interworking between the Public Land Mobile Network (PLMN) and the Packet Switched Public Data Network (PSPDN) for Packet Assembly/Disassembly facility (PAD) access".

[7] GSM 09.06 (ETS 300 975): "Digital cellular telecommunication system (Phase 2+); Interworking between a Public Land Mobile Network (PLMN) and a Packet Switched Public Data Network/Integrated Services Digital Network (PSPDN/ISDN) for the support of packet switched data transmission services".

[8] GSM 09.07 (ETS 300 976): "Digital cellular telecommunications system (Phase 2+); General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".

[9] CCITT Recommendation I.440 (Redbook): "ISDN user-network interface data link layer – General aspects".

[10] CCITT Recommendation I.441 (Redbook): "ISDN user-network interface, data link".

[11] CCITT Recommendation Q.920 (Redbook): "ISDN user-network interface data link layer – General aspects".

[12] CCITT Recommendation Q.921 (Redbook): "ISDN user-network interface – data link".

[13] CCITT Recommendation Q.921bis: "Abstract test suites for LAPD conformance tests".

[14] CCITT Recommendation Q.922: "ISDN data link layer specification for frame mode bearer services".

[15] CCITT Recommendation V.42bis: "Data Compression for Data Circuit Terminating Equipment (DCE) using Error Correction Procedures".

[16] CCITT Recommendation X.25 (Redbook): "Interface between Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE) for terminals operating in Packet Mode and connected to Public Data Networks by dedicated Circuit".

[17] ISO/IEC Recommendation 4335: "Information technology – Telecommunications and information exchange between systems – High level data link control (HDLC) procedures – Elements of procedures".

[18] ISO Recommendation 3309: "Information technology – Telecommunications and information exchange between systems – High level data link control (HDLC) procedures – Frame structure".

[19] ISO Recommendation 7498: "Information processing systems – Open Systems Interconnection – Basic Reference Model".

[20] ISO Recommendation 8885: "Information technology – Telecommunication and information exchange between systems – High-level data link control (HDLC) procedures – General purpose XID frame information field content and format".

[21] ISO Recommendation 8886: "Information technology – Telecommunication and information exchange between systems – Data link service definitions for Open Systems interconnection".

[22] ISO Recommendation 8509: "Information processing systems – Open Systems Interconnection – Service conventions".

[23] ISO/IEC Recommendation 7809: "Information technology – Telecommunication and information exchange between systems – High-level data link control (HDLC) procedures – Classes of procedures".

[24] ISO Recommendation 7776: "Information processing systems – High-level data link control procedures – Description of the X.25 LAPB-compatible DTE data link procedures".

2.1 Definitions and abbreviations

Abbreviations used in this ETS are listed in GSM 01.04 [1].

For the purposes of this ETS, the following definitions apply:

backwards compatibility: RLP defines several backwards-compatible versions. That means that a newer version can interwork with an older one without changing the older one. This is realized by a fall back mechanism during XID exchange.

command: An instruction represented in the RLP header, causing the receiving RLP entity to execute a specific function.

frame check sequence: A field of redundant information based on a cyclic code, used for error detection.

I + S frame: An RLP frame that is used for user information transfer, carrying supervisory information piggyback.

improper frame: An RLP frame having an FCS error or having a header the contents of which is inconsistent with this Specification.

non-transparent: In PLMN data transmission, a configuration where at layer 2, protocol information of the fixed network is mapped on RLP elements, and vice versa.

piggybacking: Means by which one and the same frame can carry both user information and RLP related supervisory information.

response: A reply represented in the RLP-header, by which the sending RLP entity reports back about its status.

RLP frame: A sequence of contiguous bits, representing an RLP procedural element.

RLP header: That part of an RLP frame that encodes either a command or a response, located at the beginning of the RLP frame.

S frame: An RLP frame that contains supervisory information in the absence of user information.

transparent: In PLMN data transmission, a configuration where at layer 2 (and also at the layers above) no protocol conversion takes place.

U frame: An RLP frame that contains unnumbered protocol control information.