SIST ETS 300 582 E3:2003

European digital cellular telecommunications system (Phase 2); General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS) (GSM 07.01)

....

Evropski digitalni celični telekomunikacijski sistem (faza 2) – Splošno o terminalskih prilagodilnih funkcijah (TAF) za mobilne postaje (MS) (GSM 07.01)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 582 ed.3 (1996-01) - European digital cellular telecommunications system (Phase 2); General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS) (GSM 07.01)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 582 E3:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±6SORãQRR
WHUPLQDOVNLKSULODJRGLOQLKIXQNFLMDK7$)]DPRELOQHSRVWDMH06*60
European digital cellular telecommunications system (Phase 2); General on Terminal
Adaptation Functions (TAF) for Mobile Stations (MS) (GSM 07.01)
Ta slovenski standard je istoveten z: ETS 300 582 Edition 3
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 582 E3:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 582 E3:2003

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SIST ETS 300 582 E3:2003
EUROPEAN ETS 300 582
TELECOMMUNICATION January 1996
STANDARD Third Edition
Source: ETSI TC-SMG Reference: RE/SMG-040701PR2
ICS: 33.060.50
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
General on Terminal Adaptation Functions (TAF)
for Mobile Stations (MS)
(GSM 07.01)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
*
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

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ETS 300 582: January 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions and abbreviations.9
4 Access reference configuration. 10
5 Functions to support data services.11
6 Support of non transparent Bearer Services .12
6.1 Functions of the Layer 2 Relay.12
6.2 Radio Link Services Used .13
6.3 Flow Control - General Description.13
6.3.1 End to End Flow Control.13
6.3.2 Back Pressure .13
6.3.3 Receive not Ready.14
7 Structure of the GSM 07-series of Specifications.14
8 Functions common to all interfaces .14
8.1 Synchronization of the Traffic Channel.14
8.2 Filtering of Channel Control Information.15
8.2.1 General . 15
8.2.2 Filtering process to be applied. 15
8.3 Terminal Compatibility Decision .17
8.3.1 Compatibility Check.17
8.3.2 Selection of Appropriate Terminal Function.17
8.3.3 Indication of Compatibility Requirements to the PLMN.18
8.3.3.1 Indication in case of Mobile terminating calls.18
8.3.3.2 Indication in case of Mobile originating calls.19
8.4 Test Loops .20
8.5 Alternate speech/data and speech/facsimile group 3.20
Annex A (Informative): List of Bearer Capability Elements.21
Annex B (Normative): Setting of Bearer Capability, Low Layer Compatibility and High Layer
Compatibility Information Element for GSM Bearer Services and GSM
TeleServices.25
B.0 Scope .25
B.1 Bearer Capability Information Element .25
B.1.1 Introduction.25
B.1.1.1 General Consideration.25
B.1.1.2 Interpretation of the Diagrams. 26
B.1.2 Bearer Service 21 . 26, Data Circuit Duplex Asynchronous. 36
B.1.2.1 Unrestricted digital information transfer capability.36
B.1.2.2 3.1 kHz audio ex-PLMN information transfer capability .37
B.1.3. Bearer Service 31 . 34, Data Circuit Duplex Synchronous.38

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B.1.3.1 Unrestricted digital information transfer capability.38
B.1.3.1.1 Non-X.32 Cases .38
B.1.3.1.2 X.32 Case (Packet Service) .39
B.1.3.2 3.1 kHz audio ex-PLMN information transfer capability.40
B.1.3.2.1 Non-X.32 Cases .40
B.1.3.2.2 X.32 Case ( Packet Service ) .41
B.1.4 Bearer Service 41 . 46, PAD Access Asynchronous.42
B.1.5 Bearer Service 51 . 53, Data Packet Duplex Synchronous, Unrestricted digital
information transfer capability.43
B.1.6 Bearer Service 61, Alternate Speech/Data.44
B.1.6.1 Bearer Service 61,Speech .44
B.1.6.2 Bearer Service 61, 3.1 kHz audio ex-PLMN information transfer capability .45
B.1.6.2.1 Asynchronous.45
B.1.6.2.2 Synchronous.46
B.1.7 Bearer Service 81, Speech followed by Data.47
B.1.7.1 Bearer Service 81,Speech .47
B.1.7.2 Bearer Service 81, 3.1 kHz audio ex-PLMN information transfer capability .47
B.1.7.2.1 Asynchronous.47
B.1.7.2.2 Synchronous.47
B.1.8 Teleservice 11 . 12, Speech.47
B.1.9 Teleservice 21 . 23, Short Message .47
B.1.10 Teleservice 61, Alternate Speech and Facsimile group 3.47
B.1.10.1 Teleservice 61, Speech.47
B.1.10.2 Teleservice 61, Facsimile group 3.48
B.1.11 Teleservice 62, Automatic Facsimile group 3 .48
B.2 Low Layer/High Layer Compatibility Information Element.48
B.2.1 Introduction.48
B.2.1.1 General Consideration .48
B.2.1.2 Interpretation of the Tables .49
B.2.2 LLC Bearer Service 21 . 26.50
B.2.2.1 Unrestricted digital information transfer capability.50
B.2.2.2 3.1 kHz audio ex-PLMN information transfer capability.50
B.2.3 LLC Bearer Service 31 . 34.51
B.2.3.1 Unrestricted digital information transfer capability.51
B.2.3.2 3.1kHz audio ex-PLMN information transfer capability.51
B.2.4 LLC Bearer Services 41 . 46.52
B.2.5 LLC Bearer Services 51 . 53.52
B.2.5.1 Unrestricted digital information transfer capability.52
B.2.6 LLC Bearer Service 61 .52
B.2.6.1 3,1 kHz audio ex-PLMN information transfer capability,
Asynchronous.52
B.2.6.2 3,1 kHz audio ex-PLMN information transfer capability,
Synchronous.52
B.2.7 LLC Bearer Service 81 .52
B.2.7.1 3,1 kHz audio ex-PLMN information transfer capability,
Asynchronous.52
B.2.7.2 3,1 kHz audio ex-PLMN information transfer capability,
Synchronous.52
B.2.8 HLC Teleservices 11 . 12.53
B.2.9 HLC Teleservices 21 . 23.53
B.2.10 HLC Teleservice 61 .53
B.2.11 HLC Teleservice 62 .53
History .54

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ETS 300 582: January 1996
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS describes the functions required for the terminal adaptation of terminal equipment to the Mobile
Termination (MT) within the European digital cellular telecommunications system (Phase 2).
This ETS is based upon the principles of terminal adaptor functions presented in the CCITT I-series of
recommendations (I.460 - I.463).
This ETS corresponds to GSM technical specification, GSM 07.01 version 4.9.0.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE rules.
Reference is made within this ETS to GSM Technical Specifications (GSM-TS) (NOTE).
Reference is also made within this ETS to GSM 0x.xx. series. The specifications in the series can be
identified, with their full title, within the normative reference Clause of this ETS by the first two digits of
their GSM reference number e.g. GSM 09.xx series, refers to GSM 09.01, GSM 09.02, etc.
NOTE: TC-SMG has produced documents which give the technical specifications for the
implementation of the European digital cellular telecommunications system. Historically,
these documents have been identified as GSM Technical Specifications (GSM-TSs).
These TSs may have subsequently become I-ETSs (Phase 1), or ETSs (Phase 2),
whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial
reasons, still referred to in current GSM ETSs.
Transposition dates
Date of adoption of this ETS: 31 January 1996
Date of latest announcement of this ETS (doa): 30 April 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1996
Date of withdrawal of any conflicting National Standard (dow): 31 October 1996

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1 Scope
This European Telecommunication Standard (ETS) is based on the principles of terminal adaptor functions
presented in the CCITT I-series of recommendations (I.460 - I.463).
The GSM PLMN supports a wide range of voice and non-voice services in the same network. In order to
enable non-voice traffic in the GSM PLMN there is a need to connect various kinds of terminal equipments
to the Mobile Termination (MT). The target of this Specification is to outline the functions needed for the
terminal adaptation.
In the GSM 02.02, the bearer services are described. The general network configuration is described in
GSM 03.02 and the GSM PLMN access reference configuration is defined in GSM 04.02. The various
connection types used in the GSM PLMN are presented in GSM 03.10. Terminology used in this
Specification is presented in GSM 01.04. For support of data services between GSM PLMN and other
networks, see GSM 09-series of Specifications.
2 Normative references
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 100): "European digital cellular telecommunication system
(Phase 2); Abbreviations and acronyms".
[2] GSM 02.02 (ETS 300 501): "European digital cellular telecommunication system
(Phase 2); Bearer Services (BS) supported by a GSM Public Land Mobile
Network (PLMN)".
[3] GSM 02.03 (ETS 300 502): "European digital cellular telecommunication system
(Phase 2); Teleservices supported by a GSM Public Land Mobile Network
(PLMN)".
[4] GSM 03.02 (ETS 300 522): "European digital cellular telecommunication system
(Phase 2); Network architecture".
[5] GSM 03.10 (ETS 300 528): "European digital cellular telecommunication system
(Phase 2); GSM Public Land Mobile Network (PLMN) connection types".
[6] GSM 04.02 (ETS 300 551): "European digital cellular telecommunication system
(Phase 2); GSM Public Land Mobile Network (PLMN) access reference
configuration".
[7] GSM 04.08 (ETS 300 557): "European digital cellular telecommunication system
(Phase 2); Mobile radio interface layer 3 specification".
[8] GSM 04.21 (ETS 300 562): "European digital cellular telecommunication system
(Phase 2); Rate adaption on the Mobile Station - Base Station System (MS -
BSS) interface".
[9] GSM 04.22 (ETS 300 563): "European digital cellular telecommunication system
(Phase 2); Radio Link Protocol (RLP) for data and telematic services on the
Mobile Station - Base Station System (MS - BSS) interface and the Base Station
System - Mobile-services Switching Centre (BSS - MSC) interface".
[10] GSM 05.05 (ETS 300 577): "European digital cellular telecommunication system
(Phase 2); Radio transmission and reception".

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[11] GSM 07.02 (ETS 300 583): "European digital cellular telecommunication system
(Phase 2); Terminal Adaptation Functions (TAF) for services using asynchronous
bearer capabilities".
[12] GSM 07.03 (ETS 300 584): "European digital cellular telecommunication system
(Phase 2); Terminal Adaptation Functions (TAF) for services using synchronous
bearer capabilities".
[13] GSM 07.05 (ETS 300 585): "European digital cellular telecommunication system
(Phase 2); Use of Data Terminal Equipment - Data Circuit terminating Equipment
(DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast
Service (CBS)".
[14] GSM 07.06 (ETS 300 586): "European digital cellular telecommunication system
(Phase 2); Use of the V series Data Terminal Equipment - Data Circuit
terminating Equipment (DTE - DCE) interface at the Mobile Station (MS) for
Mobile Termination (MT) configuration".
[15] GSM 09.01 (ETR 109): "European digital cellular telecommunication system
(Phase 2); General network interworking scenarios".
[16] GSM 09.02 (ETS 300 599): "European digital cellular telecommunication system
(Phase 2); Mobile Application Part (MAP) specification".
[17] GSM 09.03 (ETS 300 600): "European digital cellular telecommunication system
(Phase 2); Signalling requirements on interworking between the Integrated
Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)
and the Public Land Mobile Network (PLMN)".
[18] GSM 09.04 (ETS 300 601): "European digital cellular telecommunication system
(Phase 2); Interworking between the Public Land Mobile Network (PLMN) and
the Circuit Switched Public Data Network (CSPDN)".
[19] GSM 09.05 (ETS 300 602): "European digital cellular telecommunication system
(Phase 2); Interworking between the Public Land Mobile Network (PLMN) and
the Packet Switched Public Data Network (PSPDN) for Packet
Assembly/Disassembly (PAD) facility access".
[20] GSM 09.06 (ETS 300 603): "European 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".
[21] GSM 09.07 (ETS 300 604): "European digital cellular telecommunication 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)".
[22] GSM 09.08 (ETS 300 626): "European digital cellular telecommunication system
(Phase 2); Application of the Base Station System management Application Part
(BSSMAP) on the E-interface".
[23] GSM 09.10 (ETS 300 605): "European digital cellular telecommunication system
(Phase 2); Information element mapping between Mobile Station - Base Station
System and BSS - Mobile-services Switching Centre (MS - BSS - MSC)
Signalling procedures and the Mobile Application Part (MAP)".
[24] GSM 09.11 (ETS 300 606): "European digital cellular telecommunication system
(Phase 2); Signalling interworking for supplementary services".

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[25] GSM 09.90 (ETR 111): "European digital cellular telecommunication system
(Phase 2); Interworking between Phase 1 infrastructure and Phase 2 Mobile
Stations (MS)".
[26] CCITT Series V Recommendations: "Data communication over the Telephone
network".
[27] CCITT Series X Recommendations: "Data communication networks".
[28] CCITT Recommendation X.25 "Interface between data terminal equipment
(DTE) and data circuit - terminating equipment (DCE) for terminals operating in
the packet mode and connected to public data networks by dedicated circuit".
[29] CCITT Recommendation X.150: "Data Communication Networks:Transmission,
Signalling and Switching, Network Aspects, Maintenance and Administrative
Arrangements".
[30] CCITT Recommendation V.25bis: "Automatic Calling and/or Answering
Equipment on the General Switched Telephone Network (GSTN) using the 100-
Series Interchange Circuits".
[31] CCITT Recommendation V.54: "Loop Test Devices for Modems".
[32] CCITT Recommendation V.110: "Support of data terminal equipments (DTEs)
with V-Series interfaces by an integrated services digital network".
[33] CCITT Recommendation I.460-I.464: "ISDN Overall Network Aspects and
Functions, User Network Interfaces".
[34] ETS 300 102-1: "Integrated Services Digital Network (ISDN); User-network
interface layer 3 specifications for basic call control".
[35] ETR 018: "Integrated Services Digital Network (ISDN), Application of the BC-
HLC-,LLC-Information elements by terminals supporting ISDN services".
[36] ISO/IEC 6429: "Information technology - Control functions for coded character
sets".
3 Definitions and abbreviations
In addition to those below, abbreviations used in this specification are listed in GSM 01.04.
CALL PROC CALL PROCEEDING
CALL CONF CALL CONFIRMED
CONNACK CONNECT ACKNOWLEDGEMENT

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4 Access reference configuration
Figure 1 presents the reference configuration for access to a GSM PLMN (see GSM 04.02).
           MS
  :<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>:
  :              �˜˜˜˜˜˜˜¿ : �˜˜˜˜˜˜˜˜˜˜˜¿
  :              ‡ MT0 ˆ˜˜¯˜˜· BSS/MSC ‡
  :              �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜˜˜˜˜�
  :       �˜˜˜˜˜˜˜¿   �˜˜˜˜˜˜˜¿ : �˜˜˜˜˜˜˜˜˜˜˜¿
  :       ‡ TE1 ˆ˜˜¯˜˜· MT1 ˆ˜˜¯˜˜· BSS/MSC ‡
  :       �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜˜˜˜˜�
  �˜˜˜˜˜˜˜¿   �˜˜˜˜˜˜˜¿ : �˜˜˜˜˜˜˜¿ : �˜˜˜˜˜˜˜˜˜˜˜¿
  ‡ TE2 ˆ˜˜¯˜˜· TA  ˆ˜˜¯˜˜· MT1 ˆ˜˜¯˜˜· BSS/MSC ‡
  �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜˜˜˜˜�
  �˜˜˜˜˜˜˜¿ :       : �˜˜˜˜˜˜˜¿ : �˜˜˜˜˜˜˜˜˜˜˜¿
  ‡ TE2 ˆ˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜· MT2 ˆ˜˜¯˜˜· BSS/MSC ‡
  �˜˜˜˜˜˜˜� :       : �˜˜˜˜˜˜˜� : �˜˜˜˜˜˜˜˜˜˜˜�
        :       :       :
        R       S       Um
˜¯˜ = reference point
TE1 = ISDN terminal
TE2 = V- or X-type terminal
TA = Terminal Adaptor
BSS = Base Station System
MSC = Mobile Switching Centre
Figure 1: GSM PLMN Access Reference Configuration
Within the scope of this Specification, the Mobile Termination MT0 means a fully integrated MS including
data terminal and its adaptation functions. MT1 includes ISDN terminal adaptation functions and MT2
includes CCITT V- or X-series terminal adaptation functions among other MT functions.

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5 Functions to support data services
The main functions of the MT to support data services are:
- functions to ensure conformity of terminal service requests to network capability
- physical connection of the reference points R and S
- flow control of signalling and mapping of user signalling to/from GSM PLMN access signalling
- rate adaptation of user data (see GSM 04.21)
- flow control of non-transparent user data and mapping of flow control for asynchronous data
services
- support of data integrity between the MS and the interworking function in the GSM PLMN
- end-to-end synchronization between terminals
- filtering of status information
- functions to support non-transparent bearer services e.g. termination of the Radio Link Protocol
(RLP) and the Layer 2 Relay function (L2R) (where applicable)
- terminal compatibility checking
- optional support of local test loops
In addition, functions to support autocalling and autoanswering are optionally specified in accordance with
CCITT Rec. V.25 bis (although the use of other autocalling/autoanswering procedures are not prohibited
provided that mapping in a functionally equivalent way to GSM 04.08 call control is also provided).
Other functional entities can be envisaged apart from the TAF. One of the physical interface to all these
functions is the DTE/DCE interface to the MT. Normally, this DTE/DCE interface is associated with the
TAF, if available. Therefore, the access to any of these other functional entities, if implemented, via the
DCE/DTE interface must be triggered by appropriate command sequences which are described in the
applicable specifications (although the use of other procedures is not prohibited provided that mapping in a
functionally equivalent way is also provided). These command sequences can be issued by the DTE only
when the MT is in the appropriate command status and there is no data connection pending. They are
interpreted by an MT internal control function and result in an association of the DTE/DCE interface with
the addressed function, if available.

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6 Support of non transparent Bearer Services
In order to support non transparent bearer services, a Layer 2 Relay (L2R) function is included in the
mobile termination. The details of the particular L2R function for the different non transparent bearer
services are contained in the appropriate GSM 07-series Specification. This section describes the general
aspects of the L2R function.
The Layer 2 Relay (L2R) function provides for the reliable transportation of known, i.e. non transparent,
user protocols across the radio interface of a GSM PLMN. The L2R functions are located in the Mobile
Termination (MT) and the Interworking Function (IWF) associated with a Mobile Switching Centre (MSC).
The L2R uses the services provided by the Radio Link Protocol (RLP) to transport the non transparent
protocol information between the MS and the IWF.
6.1 Functions of the Layer 2 Relay
The complete protocol reference models for data and telematic services are described in GSM 03.10. The
subset of those protocol reference models relating to the L2R function is reproduced in Figure 2.
MS                IWF
˜˜˜˜˜˜˜˜˜˜˜˜˜ Transparent higher layer protocol ˜˜˜˜˜˜˜˜˜˜˜˜˜
    �˜˜˜˜˜˜˜˜˜¿            �˜˜˜˜˜˜˜˜˜¿
    ‡  L2R  ˆ˜˜˜˜˜ L2R Protocol ˜˜˜˜·  L2R  ‡
˜ NTP ˜˜·  �˜´˜˜˜·            ˆ˜˜˜´˜¿  ˆ˜˜ NTP ˜˜
    ‡  ‡ ‡  ˆ˜ Radio Link Protocol ˜·  ‡ ‡  ‡
    ˆ˜˜˜· ˆ˜˜˜·            ˆ˜˜˜· ˆ˜˜˜·
˜ IFP ˜˜·  ‡                  ‡  ˆ˜˜ IFP ˜˜
    ˆ˜˜˜·                  ˆ˜˜˜·
NTP Non Transparent Protocol
IFP Interface Protocol
Figure 2
The Non Transparent Protocol (NTP) will normally be a layer 2 protocol for OSI conformant protocols or an
equivalent in the case of non OSI protocols. The Interface Protocol (IFP) will normally be a layer 1 protocol
for OSI conformant systems or equivalent for non OSI systems.
The L2R can be considered to consist of 3 sub-functions, see figure 3.
         �˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
         ‡              ‡
         ‡    Relay Entity    ‡
         ‡              ˆ˜˜˜˜˜˜˜˜˜˜˜
         ‡              ‡
         ‡           L2RP ‡
    ˜˜˜˜˜˜˜˜˜˜·  NTP        Entity ‡
         ‡ Entity  �˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜·
         ‡      ‡  ‡      ‡
         ‡      ‡  ‡  RLP   ‡
         ‡      ‡  ‡  Entity  ‡
         ˆ˜˜˜˜˜˜˜˜˜˜˜·
Figure 3
The 3 sub-functions are:

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- A Non Transparent Protocol Entity
- A L2R Protocol Entity
- A Relay Entity
The NTP-entity interfaces the L2R to the IFP-entity and provides an interface to the particular NTP.
The L2RP-entity interfaces the L2R to the RLP-entity and provides an interface to the appropriate L2R
protocol.
The Relay-entity provides the mapping between the NTP-entity and the L2R-entity.
It s
...