1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.329 (03/2000) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CAT I ON S Interworking between networks - General General arrangements for i nterworki ng between networks providing frame relay data trans
2、mission services and B-ISDN ITU-T Recommendation X.329 (Previously CCITT Recommendation) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrati
3、ve arrangements Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protocol specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing OPEN SYSTEMS INTERCONNECTION INTERWORKING BETWEEN NETWORKS X.
4、l-X.19 X.20-X.49 X.50-X.89 X.90-X. 149 X.150-X. 179 X. 180-X. 199 X.200-X.209 X.2 1 0-X.2 19 X.220-X.229 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.280-X.289 X.290-X.299 General X3O-X.349 Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS
5、Networking Efficiency Quality of service Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions and ODMA functions OS1 MANAGEMENT SE
6、CURITY OS1 APPLICATIONS Cornmitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING x.350-x.399 X.400-X.499 X.500-X.599 X.600-X.629 X.630-X.639 X.640-X.649 X.650-X.679 X.680-X.699 X.700-X.709 X.71 0-X.7 19 X.720-X.729 x.730-x.799 X.800-X.849 X.850-X.859
7、 X.860-X.879 X.880-X.899 X.900-X.999 For further details, please rer to ITD-T List of Recommendations. ITU-T RECOMMENDATION X.329 GENERAL ARRANGEMENTS FOR INTERWORKING BETWEEN NETWORKS PROVIDING FRAME RELAY DATA TRANSMISSION SERVICES AND B-ISDN Summary This Recommendation defiies general arrangement
8、s for interworking between networks providing Frame Relay Data Transmission Services (FRDTS) and B-ISDN. It includes reference configurations, protocol stacks, FR/ATM element mapping and other general arrangements required for various interworking scenarios between the two types of networks. In part
9、icular, it focuses on the cases where dedicated Frame Relay networks are involved in such interworking scenarios. Source ITU-T Recommendation X.329 was prepared by ITU-T Study Group 7 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 3 1 March 2000. Recommendation X.329 (03/2
10、000) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff q
11、uestions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Rec
12、ommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 a
13、nd 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 The ITU draws attention to the possibility that the practice or implementation of this Reco
14、mmendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date o
15、f approval of this Recommendation, the ITU had not 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 information and are therefore strongly urged to consul
16、t the TSB patent database. O ITU 2000 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing fiom the ITU. Recommendation X.329 (03/2000) 11 CONTENTS Sco
17、pe References Terms and Definitions Abbreviations Conventions Reference Configurations . 6.1 General arrangements for Case A . 6.2 General arrangements for Case B FRATM element mapping at IWF . 7.1 Protocol mappings . 7.2 Mappings specific to service interworking 7.3 OAM mappings . 7.4 PVC status ma
18、nagement mappings . Annex A . Mapping of traffic parameters . A.l Traffic descriptor . Annex B . FRATM PVC status reporting procedures for network interworking . Annex C . FRATM PVC status monitoring for service interworking Requirements for FRATM PVC status management . FR PVC management procedures
19、 . ATM PVC management procedures . Appendix I . Example of service interworking using translation mode C.l C.2 C.3 Recommendation X.329 (03/2000) Page 1 1 2 2 3 3 3 6 10 10 13 13 14 14 14 16 16 16 17 18 20 1 111 Recommendation X.329 GENERAL ARRANGEMENTS FOR INTERWORKING BETWEEN NETWORKS PROVIDING FR
20、AME RELAY DATA TRANSMISSION SERVICES AND B-ISDN (Geneva, 2000) 1 Scope This Recommendation defiies general arrangements for interworking between FRDTS provided by public data networks and B-ISDN. It includes reference configurations, protocol stacks and FR/ATM element mappings. 2 References The foll
21、owing ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. Ail Recommendations and other references are subject to revision; all users of this
22、Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation 1.233.1 (1 99 i), ISDN frame relaying
23、bearer service. ITU-T Recommendation 1.361 (1 999), B-ISDN ATM layer specijcation. ITU-T Recommendation 1.363.5 (1996), B-ISDNATMAdaptation Layer specijcation: Type 5 AAL. ITU-T Recommendation 1.365.1 (1993), B-ISDN ATM adaptation layer sublayers: Frame relaying service specijc convergence sublayer
24、(FR-SSCS). ITU-T Recommendation 1.371 (1996), Trafic control and congestion control in B-ISDN. ITU-T Recommendation 1.555 (1 997), Frame Relaying Bearer Service intenuorking. ITU-T Recommendation 1.61 O (1 999), B-ISDN operation and maintenance principles and functions. ITU-T Recommendation 1.620 (1
25、 996), Frame relay operation and maintenance principles and functions. ITU-T Recommendation Q.293 1 (1995), Digital Subscriber Signalling System No. 2 SS 2) - User-Network Interface (UNI) -Layer 3 specijcation for basic callkonnection control. ITU-T Recommendation Q.2933 (1996), Digital subscriber S
26、ignalling System No. 2 SS 2) - Signalling specijcation for Frame Relay service. ITU-T Recommendation X.36 (2000), Interface between Data Terminal Equipment PTE) and Data Circuit- terminating Equipment (DCE) for public data networks providing frame relay data transmission service by dedicated circuit
27、. ITU-T Recommendation X.76 (2000), Network-to-network interface between public data networks providing the frame relay data transmission service. ITU-T Recommendation X.300 (1996), General principles for intenuorking between public networks and between public networks and other networks for the pro
28、vision of data transmission services. Recommendation X.329 (03/2000) 1 3 Terms and Definitions This Recommendation defines the following term: 3.1 FR-SSCS: FR-SSCS is used at the TE and AU to interworking between AAL and LAPF. 4 Abbreviations This Recommendation uses the following abbreviations: AAL
29、 ATC ATM AU B-ISDN B-TE BCOB BECN Bc Be CI CIR CPCS CPCS-CI CPCS-LP CPCS-uu DE DLCI DTE DTP FECN FR-DTE FR-SSCS FRDTS ISDN IWF LP PDU PVC SAR ATM Adaptation Layer ATM Transfer Capability Asynchronous Transfer Mode Access Unit Broadband ISDN TE subscribing to a B-ISDN Broadband Connection Oriented Be
30、arer class Backward Explicit Congestion Notification Committed Burst Excess Burst Congestion Indication Committed Information Rate Common Part Convergence Sublayer CPCS-Congestion Indication CPCS-Loss Priority CPCS-User-to-User indication Discard Eligibility Data Link Connection Identifier Data Term
31、inal Equipment (as traditionally defined in X-series Recommendations) Data Transfer Protocol Forward Explicit Congestion Notification DTE subscribing to a network providing FRDTS Frame Relaying Service Specific Convergence Sublayer Frame Relay Data Transmission Service Integrated Services Digital Ne
32、twork Interworking Function Loss Priority Protocol Data Unit Permanent Virtual Circuit Segmentation and Reassembly 2 Recommendation X.329 (03/2000) SSCF Service Specific Coordination Function sscs Service Specific Convergence Sublayer svc Switched Virtual Circuit TE Terminal Equipment (as traditiona
33、lly defiied in I-series Recommendations) vcc Virtual Channel Connection VCI Virtual Channel Identifier VPI Virtual Path Identifier 5 Conventions No particular conventions are included. 6 Reference Configurations In this recommendation two possible alternative cases below are considered. Case A Inter
34、working (Access) cases where a network providing FRDTS and a B-ISDN are involved. This case will be used to set up a connection from a B-TE connected to the B-ISDN network to a FR-DTE connected to the network providing FRDTS, and vice versa. Case B Interworking cases where two networks providing FRD
35、TS are concatenated via (a) B-ISDN(s). This case will be used to connect two networks providing FRDTS via a B-ISDN that is used as a backbone network. 6.1 General arrangements for Case A Case A can be subdivided further into the following three cases: (A-1) Port access cases (see Recommendation X.30
36、0) where an end-to-end connection shall be set up by two stages; the fiist stage setting up an ATM SVC connection between the B-TE and the AU, then the second stage setting up an frame relay SVC connection end-to-end. (A-2) Call control mapping (see Recommendation X.300) and Network interworking cas
37、es (see Recommendation 1.555) where an end-to-end connection shall be set up by one stage in which frame relay adaptation protocols are performed over the B-ISDN connection; call control signals shall be mapped one to one between both sides of the IWF and the B-TE knows that the destination DTE is a
38、 FR-DTE. (A-3) Call control mapping and Service interworking cases (see Recommendation 1.555) where an end-to-end connection shall be set up by one stage in which the IWF shall completely convert the two native services and protocols one from the other. Note that in case of port access, frame relay
39、adaptation protocols shall be used at the second stage. Thus, this case can be categorized as the Network interworking cases as well. Aiso, such frame relay adaptation protocols shall also be used for transmitting data frames on the U-plane at the B-ISDN side in the fiist two cases. Recommendation X
40、.329 (03/2000) 3 6.1.1 In this case, a B-ISDN SVC shall be set up between the B-TE and the AU using DSS2 signalling procedures as specified in Recommendation Q.2931 at the first stage (C-plane procedures). Then, the full X.36 procedures shall be performed end-to-end using the frame relay adaptation
41、protocols over the U-plane (see Figure 1). Multiple frame relay SVCs may be multiplexed onto one B-ISDN SVC. NOTE - B-ISDN PVC may be used instead of B-ISDN SVC. In this case the first stage does not exist. Further, X.361Q.933 PVC may be used instead of X.36lQ.933 SVC. No X.361Q.933 PVCs exist over
42、B-ISDN SVCs. The FR-SSCS, as shown in Figure 1 , supports the FR core functions of Recommendation 1.233.1. The ATM layer is specified in Recommendation 1.361 and the AAL composed of the SAR and CPCS sublayers is specified in Recommendation 1.363.5. AAL type 5 (SAR and CPCS) shall be used for FR and
43、B-ISDN interworking. The FR-SSCS is defiied in Recommendation 1.365.1. The FR-SSCS-PDU has exactly the same structure as the FR address field without the flags, zero bit insertion and FCS, as specified in Recommendation 1.365.1. Detailed procedures for this case are defiied in Recommendation X.46. P
44、ort access cases (Case A-1) FR-SSCS (1.365.1) 4 X.36lQ.933 + Q.922 Access unit FR- DTE B-TE e- - -._ - ,.- DSS2 Signalling (Q.2931) SSCF (UNI) SSCOP ML5 ATM Physical -plane (Ist stage) X.36lQ.933 FR-SSCS (1.365.1 ) ML5 ATM Physical U-plane Signalling (Q.2931) Physical Physical C-plane (Ist stage) Ph
45、ysical Physical U-plane Physical C-plane (Ist stage) Recommendation X.329 (03/2000) X.36lQ.933 + Q.922 Physical T0732680-9 U-plane Figure 1B1.329 - Arrangement for Port access cases (Case A-1) do1 6.1.2 In this case, the B-TE and the IWF perform Q.2933 signalling to simultaneously set up a B-ISDN SV
46、C and frame relay SVC. Multiple frame relay SVCs may be multiplexed onto one B-ISDN SVC (see Figure 2). NOTE - B-ISDN PVC may be used instead of B-ISDN SVC. Further, X.36/Q.933 PVC may be used instead of X.36/Q.933 SVC. No X.36/Q.933 PVCs exist over B-ISDN SVCs. Call control mapping and network inte
47、rworking cases (Case A-2) Interworking unit Signalling (Q.2933) SSCF (UNI) SSCOP ML5 F ! Physical C-plane FR-SSCS (1.365.1 ) I I IwL5 E Physical U-plane Physical Physical C-plane functions ATM I Physical1 Physical X.36/Q.933 Signalling Link (LAPF Q.922) Physical i C-plane i (ISDN-FR case)/ U-plane i
48、 (FRPDNcase) Q.922 Core functions Physical U-plane TO73341 O-OO/dOZ U-plane Figure 2B1.329 - Arrangement for the case of call control mapping and network interworking (Case A-2) Recommendation X.329 (03/2000) 5 6.1.3 Call control mapping and service interworking cases (Case A-3) ML5 In this case, th
49、e B-TE performs only the native B-ISDN signalling and the IWF shall completely convert the native B- ISDN signalling to the fiame relay signalling (see Figure 3). Therefore, the B-TE has no knowledge about the protocols of the destination terminal. One B-ISDN SVC corresponds with one fiame relay SVC. Q.922 Core functions Interworking unit B-TE .* i- *. I DSS2 Signalling (Q.2931) SSCF (UNI) SSCOP ML5 Physical Signalling 7 Physical Physical (C-plane) ATM I -1 Physical Physical X.36 Signalling Link (LAPF Q.922) Physical Q.922 Core functions Physical T0732700-99/603 (U-plane) Fi
