1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T X.36TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2003) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS Public data networks Interfaces Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for public da
2、ta networks providing frame relay data transmission service by dedicated circuit ITU-T Recommendation X.36 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities X.1X.19 Interfaces X.20X.49 Transmission, signalling and switching X.50X
3、.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.180X.199 OPEN SYSTEMS INTERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219 Connection-mode protocol specifications X.220X.229 Connectionless-mode protocol specifications X.230X.239 PICS proform
4、as X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer Managed Objects X.280X.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X.300X.349 Satellite data transmission systems X.350X.369 IP-based networks X.370X.399 MESSAGE HANDLING SYSTEMS X.400X.
5、499 DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAGEMENT Systems Management framework and architecture X.700X.709
6、Management Communication Service and Protocol X.710X.719 Structure of Management Information X.720X.729 Management functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APPLICATIONS Commitment, Concurrency and Recovery X.850X.859 Transaction processing X.860X.879 Remote operations X.880X.8
7、99 OPEN DISTRIBUTED PROCESSING X.900X.999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. X.36 (02/2003) i ITU-T Recommendation X.36 Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for public data networks providing fram
8、e relay data transmission service by dedicated circuit Summary This Recommendation defines the DTE/DCE interface for public data networks providing frame relay data transmission service by dedicated circuit. It defines frame relay basic service for permanent virtual circuits and switched virtual cir
9、cuits and frame relay link layer protocol for data transfer. It defines permanent virtual circuits management protocol and signalling for switched virtual circuits. It also defines the following network capabilities: closed user group, reverse charging, transit network selection, transfer and discar
10、d priorities and service classes, NSAP support by the network for interworking with ATM networks, multiprotocol encapsulation and selection and fragmentation at the DTE/DCE interface. This revision replaces ITU-T Rec. X.36 (2000); it has a new annex explaining the relationship between clause 11 on P
11、VC management procedures and Annex A of ITU-T Rec. Q.933 and a new appendix imported from ITU-T Rec. Q.933. This revision of ITU-T Rec. X.36 (2003) is in alignment with the latest release of ITU-T Recs Q.933 (2003) and X.76 (2003). Source ITU-T Recommendation X.36 was revised by ITU-T Study Group 17
12、 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13 February 2003. ii ITU-T Rec. X.36 (02/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (IT
13、U-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four
14、years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the n
15、ecessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to t
16、he possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside
17、of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest inf
18、ormation and are therefore strongly urged to consult the TSB patent database. ITU 2003 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. X.36 (02/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Ter
19、ms and definitions . 3 4 Abbreviations 3 5 Conventions 4 6 Description of the DTE/DCE interface (physical layer). 4 6.1 ITU-T X.21 interface 4 6.2 X.21 bis interface 5 6.3 V-series interfaces 6 6.4 G-series interfaces 6 6.5 I-series interfaces 6 7 Description of services . 6 7.1 General definition.
20、6 7.2 Multiplexing . 6 7.3 Service aspect . 7 7.4 Frame transfer priority 7 7.5 Frame discard priority 9 7.6 Frame relay service class 11 7.7 Support of both service class and priorities 11 7.8 SVC related services. 11 8 Service parameters and service quality. 11 8.1 Scope 11 8.2 Service parameters
21、12 8.3 SVC related service parameters 13 8.4 Service quality 14 9 Data link transfer control 14 9.1 General . 14 9.2 Frame format 14 9.3 Addressing 15 9.4 Transmission consideration 18 9.5 Frame relay data transmission service over SDH. 20 9.6 Fragmentation. 20 10 Call connection control. 24 10.1 Ge
22、neral . 24 10.2 Signalling channel 24 10.3 List of the signalling channel link layer parameters. 25 10.4 Call states 25 iv ITU-T Rec. X.36 (02/2003) Page 10.5 Message definitions 26 10.6 General message format and information element coding. 33 10.7 Call establishment and clearing procedures . 58 10
23、.8 Status enquiry and status procedures 65 10.9 Restart procedure 66 10.10 Handling of error conditions 67 10.11 List of timers. 71 10.12 Closed user group facility. 73 10.13 Transit network selection facility . 76 10.14 Reverse charging facility 76 10.15 Frame Transfer priority 76 10.16 Frame Disca
24、rd priority . 77 10.17 Frame Relay Service Class. 78 10.18 Support of both Service Class and Priorities 78 10.19 Charging information . 79 11 PVC management procedures. 79 11.1 Overview 79 11.2 Message definition 80 11.3 Message specific information elements 81 11.4 Description of procedures. 83 11.
25、5 Optional bidirectional network procedures 88 11.6 System parameters 90 12 Congestion control 91 12.1 General . 91 12.2 Impact of congestion 92 12.3 Congestion notification 92 12.4 DTE congestion detection method and actions 94 Annex A List and status of the X.36 parameters 94 Annex B Functional su
26、pport at the DTE/DCE interface. 98 B.1 Protocol Capabilities (PC) 98 B.2 Frames protocol data units (FR). 98 B.3 System Parameters (SP) . 99 Annex C Consolidated Link Layer Management (CLLM) message 99 C.1 Address octets. 100 C.2 Control field 100 C.3 XID information field. 100 C.4 FCS field. 103 C.
27、5 Network CLLM message transmission procedure . 103 ITU-T Rec. X.36 (02/2003) v Page Annex D Use of frame relay for multiprotocol encapsulation 105 D.1 General frame format . 105 D.2 Frame format for ISO CLNP (ISO/IEC 8473) . 106 D.3 Frame format for IP 107 D.4 Frame format for protocols with Ethert
28、ype code point 107 D.5 Frame format for bridged packets 108 D.6 Low layer compatibility negotiation procedures 117 D.7 Examples 119 D.8 Protocol encapsulation format 121 Annex E Usage of cause and location. 121 E.1 Location field generation 121 E.2 Cause values . 122 E.3 Coding of the diagnostic fie
29、ld 131 Annex F Use of NSAP at the DTE-DCE interface . 132 F.1 Introduction 132 F.2 Encoding of X.121 numbers as NSAP . 133 F.3 Encoding of E.164 numbers as NSAP 134 F.4 Other ATM End System Address coding. 134 Annex G Enhancements to PVC management procedures. 134 G.1 Introduction 134 G.2 List of ch
30、anges to clause 11 135 Annex H Procedures defined in X.36 clause 11 and Q.933 Annex A 136 Appendix I Examples of PVC management error events . 136 I.1 Loss of STATUS ENQUIRY message. 136 I.2 Loss of STATUS message 137 I.3 Invalid Receive Sequence Number 138 Appendix II DTE congestion detection metho
31、ds and actions. 139 II.1 Implicit congestion detection . 139 II.2 Explicit congestion detection . 139 Appendix III Handling of physical layer loopback conditions when using frame relay PVC bidirectional procedures. 140 III.1 Recommended procedures for DTE/DCE that can detect loopback at the physical
32、 layer 140 III.2 Recommended procedures for DTE/DCE that cannot detect loopback at the physical layer 140 Appendix IV Information on address 141 IV.1 Main address and complementary address. 141 IV.2 Addresses in SETUP message 141 IV.3 Addresses in CONNECT message . 141 vi ITU-T Rec. X.36 (02/2003) P
33、age IV.4 Addresses processing by the network in SETUP message. 142 IV.5 Addresses processing by the network in CONNECT message 142 Appendix V International network identification according to ITU-T Rec. X.125 for networks providing frame relay services and numbered under the E.164 numbering plan . 1
34、43 V.1 Introduction 143 V.2 Assignment and notification process 143 Appendix VI Call state diagrams at the DCE side of the DTE/DCE interface and DCE actions. 143 VI.1 Foreword. 143 VI.2 Symbol definition of the call state diagrams 144 VI.3 Call state diagrams . 144 VI.4 Actions taken by the DCE on r
35、eceipt of message in a given call state at the DCE side of the DTE/DCE interface 146 Appendix VII Window size for a data link layer protocol 147 ITU-T Rec. X.36 (02/2003) 1 ITU-T Recommendation X.36 Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for publ
36、ic data networks providing frame relay data transmission service by dedicated circuit 1 Scope This Recommendation defines the interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for public data networks providing frame relay data transmission service by dedic
37、ated circuit. It defines frame relay basic service for permanent virtual circuits and switched virtual circuits and frame relay link layer protocol for data transfer. It defines permanent virtual circuits management protocol and signalling for switched virtual circuits. It defines also the following
38、 network capabilities: Closed user group; Reverse charging; Transit network selection; Support of NSAP; Transfer and discard priorities; Service classes; Fragmentation at the DTE/DCE interface; Multiprotocol encapsulation and selection. 2 References The following ITU-T Recommendations and other refe
39、rences contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to inv
40、estigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the statu
41、s of a Recommendation. ITU-T Recommendation E.164 (1997), The international public telecommunication numbering plan. ITU-T Recommendation G.703 (2001), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544
42、, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.707/Y.1322 (2000), Network node interface for the synchronous digital hierarchy SDH. ITU-T Recommendation G.732 (1988), Characteristics of primary PCM multiplex equipment operating at 2048 kbit/s. ITU-T Recommendation I
43、.122 (1993), Framework for frame mode bearer services. ITU-T Recommendations I.233.x series, Frame mode bearer services. 2 ITU-T Rec. X.36 (02/2003) ITU-T Recommendation I.363.5 (1996), B-ISDN ATM Adaptation Layer specification: Type 5 AAL. ITU-T Recommendation I.370 (1991), Congestion management fo
44、r the ISDN frame relaying bearer service. ITU-T Recommendation I.372 (1993), Frame relaying bearer service network-to-network interface requirements. ITU-T Recommendation I.430 (1995), Basic user-network interface Layer 1 specification. ITU-T Recommendation I.431 (1993), Primary rate user-network in
45、terface Layer 1 specification. ITU-T Recommendation Q.850 (1998), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part. ITU-T Recommendation Q.921 (1997), ISDN user-network interface Data link layer specification. ITU-T Recommen
46、dation Q.922 (1992), ISDN data link layer specification for frame mode bearer services. ITU-T Recommendation Q.931 (1998), ISDN user-network interface layer 3 specification for basic call control. ITU-T Recommendation Q.933 (2003), ISDN Digital subscriber Signalling System No. 1 (DSS1) Signalling sp
47、ecifications for frame mode switched and permanent virtual connection control and status monitoring. ITU-T Recommendations Q.951.x series, Stage 3 description for number identification supplementary services using DSS1. ITU-T Recommendation T.50 (1992), International Reference Alphabet (IRA) (Former
48、ly International Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T Recommendation X.21 (1992), Interface between Data Terminal Equipment and Data Circuit-terminating Equipment for synchronous operation on public data networks. ITU-T Recommenda
49、tion X.21 bis (1988), Use on public data networks of Data Terminal Equipment (DTE) which is designed for interfacing to synchronous V-series modems. ITU-T Recommendation X.25 (1996), 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. ITU-T Recommendation X.121 (2000), International numbering plan for public dat
