1、 STD-ITU-T RECMN 1-57L-ENGL L77b m LIBb2591 b32784 LOO m INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.571 (08196) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Internetwork interfaces Connection of VSAT based private networks to the public ISDN TU-T R
2、ecommendation 1.571 (Previously CCITT Recommendation) STD-ITU-T RECHN 1-57L-ENGL L99b D 48b259L Ob327B5 047 H ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK GENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attribut
3、es General description of asynchronous transfer mode Scope General aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN Teleservices supported by an ISDN Supplementary services in ISDN Network functional principles Reference models Numbering, addres
4、sing and routing Connection types Performance objectives Protocol layer requirements General network requirements and functions Application of I-series Recommendations to ISDN user-network interfaces Layer 1 Recommendations Layer 2 Recommendations Layer 3 Recommendations Multiplexing, rate adaption
5、and support of existing interfaces Aspects of ISDN affecting terminal requirements SERVICE CAPABILITIES OVERALL NETWORK ASPECTS AND FUNCTIONS ISDN USER-NETWORK INTERFACES INTERNETWORK INTERFACES MAINTENANCE PRINCIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Management of ATM equipment I. 1 00-1.1 99
6、1.110-1.119 1.120-1.129 I. 130-1.139 I. 140-1.149 1.1 50-1.1 99 1.200-1.299 1.200-1.209 1.210-1.219 I .220-1.229 1.230-1.239 1.240-1.249 I .250-1.299 1.300-1.399 I. 31 0-1.3 1 9 1.320-1.329 I. 3304.339 1.340-1.349 1.350-1.359 1.360-1.369 1.370-1.399 1.400-1.499 1.420-1.429 1.430-1.439 1.440-1.449 1.
7、450-1.459 1.460-1.469 1.470-1.499 I$OO-1.599 1.600-1.699 1.700-1.799 1.730-1.749 I .750-1.799 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN 1.571-ENGL 1996 Li8b259L Ob3278b T83 ITU-T RECOMMENDATION 1.571 CONNECTION OF VSAT BASED PRIVATE NETWORKS TO THE PUBLIC IS
8、DN Source ITU-T Recommendation 1.571 was prepared by ITU-T Study Group 13 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 27th of August 1996. STD-ITU-T RECMN 1.571-ENGL 17b 48b25L Ob32787 9LT m FOREWORD ITU (International Telecommunication Union) is the United Nations
9、Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the IT. The IT-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunic
10、ations 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 Recommendations on these topics. The approval of Recommendations by the Members of the IT
11、U-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 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conci
12、seness 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 Recommendation may involve the use of a claimed Intellectual Property Right. The IT takes
13、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 of approval of this Recommendation, the ITU had/had not received notice of intellectual
14、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 consult the TSB patent database. O ITU 1997 All rights reserved. No part of this publicat
15、ion may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Il Recommendation 1.571 (08/96) STD-ITU-T RECMN 1-57L-ENGL 199b D LiBb259L Ob32788 5b m 1 2 3 4 5 5.1 5.2 5.3 6 6.1 6.2 7 7.1 7.2
16、 8 8.1 8.2 9 9.1 9.2 9.3 CONTENTS Scope References Definitions Abbreviations . Reference configurations Overall scenario for interconnection of VSAT networks to public ISDNs to the public ISDN Case 2: Remote access to the public ISDN via a VSAT network Case 1 : Interconnection of a VSAT based privat
17、e ISDN with ISPBX functionality Interface requirements ISDN basic access ISDN primary rate access . Service intenvorking . Bearer services 7.1.1 Bearer services for Case 1 . 7.1.2 Bearer services for Case 2 . Supplementary services Supplementary services for Case 1 . Supplementary services for Case
18、2 . 7.2.1 7.2.2 Intenvorking requirements . Access between public ISDN and VSAT based private network . Performance considerations at the ISDN interface . :. Parameter values for ISDN access signalling protocols . Parameter values for end-to-end protocols . Impacts on connection processing delays .
19、Addressing Annex A . Guidelines for VSAT networks interconnecting with a public ISDN . A . 1 Introduction A.2 Interface Recommendations . A.2.1 Interface for Case 1 . A.2.2 Interface for Case 2 . Recommendation 1.571 (08/96) Page 1 1 2 3 4 4 5 6 7 7 8 8 8 8 8 8 8 9 9 9 9 9 9 9 9 9 9 10 10 10 . 111 S
20、TDmITU-T RECMN I.571-ENGL 1776 D Li862571 0632789 772 = A.3 Circuit-mode performance Recommendations . A.3.1 Error performance . A.3.2 Availability performance . A.3.3 Slip rate performance A.4 Network performance Recommendations A.4.1 Performance-significant reference events . . A.3.4 Jitter perfor
21、mance A.4.2 Network conditions . A.4.3 Connection processing delay recommendations . A.4.4 Packet mode delay Recommendations Page 10 10 10 10 11 11 12 13 14 21 iv Recommendation 1.571 (08196) Introduction When VSAT based private networks are connected to public ISDN networks, it is desired to suppor
22、t the following: common and compatible functionality between the VSAT based private network and the public ISDN, end-to-end terminal compatibility over the composite network, terminal interchangeability whereby ISDN terminals for the different teleservices can indistinctly be attached to the VSAT ba
23、sed private network or the public ISDN, and a controlled quality of service by harmonizing the requirements of quality pertaining to the various portions of the connection. This Recommendation describes different interconnection scenarios between VSAT based private networks and public ISDNs, specifi
24、es the requirements that VSAT based private networks should satis when connecting to the public ISDN, and provides guidelines for VSAT based private network configuration and operation that contribute to maintaining a controlled quality of service and interoperability between VSAT based private netw
25、orks and the public ISDN. Recommendation 1.571 (08/96) V Recommendation 1.571 CONNECTION OF VSAT BASED PRIVATE NETWORKS TO THE PUBLIC ISDN (Geneva, 1996) 1 Scope This Recommendation describes the requirements for interconnection of VSAT based private networks to the public ISDN. In addition, guideli
26、nes are provided for VSAT based private network configuration and performance that contribute to maintaining a desirable quality of service and interoperability between VSAT based private networks and the public ISDN. 2 References The following ITU-T Recommendations and other references contain prov
27、isions 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; all users of this Recommendation are therefore encouraged to investigate the po
28、ssibility 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. CCITT Recommendation E. 164 (1 99 i), Numberingplan for the ISDN era. CCITT Recommendation 1.23 1.1 (1 988), Circuit-mod
29、e bearer service categories - Circuit- mode 64 kbit/s unrestricted, 8 kHz structured bearer service. CCITT Recommendation 1.23 1.2 (1988), Circuit-mode bearer service categories - Circuit- mode 64 kbith, 8 kHz structured bearer service usable for speech information transfer. CCITT Recommendation 1.2
30、3 1.3 (1 988), Circuit-mode bearer service categories - Circuit- mode 64 kbith, 8 kHz structured bearer service usable for 3.1 kHz audio information transfer. CCITT Recommendation 1.25 1.1 (1 992), Number identijkation supplementary services - Direct-dialling-in. CCITT Recommendation 1.25 1.2 (1 992
31、), Number idenriJication supplementary services - Multiple Subscriber Number. CCITT Recommendation 1.25 1.3 (1 992), Number identification supplementary services - Calling Line Identijkation Presentation. CCITT Recommendation 1.25 1.4 (1 992), Number identiJication supplementary services - Calling L
32、ine Identi$cation Restriction. CCITT Recommendation 1.25 1.8 (1992), Number identiJication supplementary services - Sub-addressing supplementary service. ITU-T Recommendation 1.258.1 (1 995), Mobility and modijkation supplementary services - Terminal Portability. ITU-T Recommendation 1.325 (1993), R
33、eference confzgurations for ISDN connection types. ITU-T Recommendation 1.430 (1 995), Basic user-network interface - Layer 1 spec$cation. ITU-T Recommendation 1.43 1 (1 993), Primary rate user-network interface - Layer I specification. Recommendation 1.571 (08/96) 1 STD-ITU-T RECMN 1.571-ENGL 199b
34、W Lib2591 b32772 287 m ITU-T Recommendation 1.570 (1 993), Public/private ISDN interworking. ITU-T Recommendation 4.920 (1993), ISDN user-network interface data link layer - General aspects. ITU-T Recommendation 4.921 (1993), ISDN user-network interface - Data link layer specification. ITU-T Recomme
35、ndation 4.930 (1993), ISDN user-network interface layer 3 - General aspects. ITU-T Recommendation Q.93 1 (1993), ISDN user-network interface layer 3 specification for basic call control. ITU-T Recommendation 4.932 (1993), Generic procedures for the control of ISDN supplementary services. Recommendat
36、ion Q.950-SeriesY Stage 3 description for supplementary services using DSS I. CCITT Recommendation X. 135 (1 992), Speed of service (delay and throughput) performance values for public data networks when providing international packet-switched services. ITU-T Recommendation X.36 1 (1 996), Connectio
37、n of VSAT systems with packet-switched public data networks based on X.25 procedures. Definitions This Recommendation defines the following terms. 3.1 hub: The centralized node in VSAT star networks. 3.2 measurement point (MP): An MP is located at a physical interface which separates either a (set o
38、f) Customer Premises Equipment (CPE), or a Switching or Signalling Node (SSN) from an attached transmission system at which the protocols can be observed. 3.3 measurement point T (MPT): MPT is an MP located at the interface associated with a T reference point. 3.4 measurement point I (MPI): MPI is a
39、n MP located at an interface that terminates a transmission system at an International Switching Centre (ISC). 3.5 network control station (NCS): The centralized controller in mesh VSAT networks. 3.6 terminal equipment (TE): This functional group includes functions belonging to the functional group
40、TE, and which are connected to a Private Telecommunication Network (PTN) via an S reference point as defined in Recommendation 1.570. NOTE - Terminals connected to Private Telecommunication Networks (PTNs) via an S interface are called TES in Recommendation 1.570 and not TEls. 3.7 terminal equipment
41、 1 (TE1): This functional group includes functions belonging to the functional group TE, and with an interface that complies with the ISDN user-network interface standard. 3.8 VSAT based private ISDN: A VSAT network or part of a VSAT network which offers ISDN services to non-public users. NOTE - A V
42、SAT based private ISDN is a special case of a VSAT based private network. 3.9 VSAT based private network: A VSAT network which offers services to users via a satellite which includes intra-network communications terminals which may be connected to the VSAT network using standardised or non-standardi
43、sed interfaces. 2 Recommendation 1.571 (0896) 3.10 (VSATs) are interconnected. VSAT network A type of satellite network in which Very Small Aperture Terminals NOTE - VSATs are defined in ITU-R Recommendation S.725. 4 Abbreviations This Recommendation uses the following abbreviations. BER CE CONP CPE
44、 CTR DDI DSS 1 ISC ISDN ISPBX ITU TTU-R ITU-T LAPD MP MPI MPT MSN NCS NT2 ONP PTN PTNX R-ISPBX R-VSAT S SSN SUB T T-ISPBX T-VSAT TE TE 1 TP Bit Error Ratio Connection Element Connected Name Identification Presentation Customer Premises Equipment Common Technical Regulation Direct-Dialling-In Digital
45、 Subscriber Signalling System No. 1 International Switching Centre Integrated Services Digital Network ISDN Private Branch Exchange International Telecommunication Union International Telecommunication Union - Radiocommunication Sector International Telecommunication Union - Telecommunication Standa
46、rdization Sector Link Access Procedure on the D-channel Measurement Point Measurement Point at an ISC Measurement Point at reference point T Multiple Subscriber Number Network Control Station Network Termination 2 Open Network Provision Private Telecommunication Network Private Telecommunication Net
47、work Exchange Remote ISDN Private Branch Exchange Remote Very Small Aperture Terminal Interface reference point S Switching or Signalling Node Subaddressing Interface reference point T Transit ISDN Private Branch Exchange Transit Very Small Aperture Terminal Terminal Equipment Terminal Equipment typ
48、e 1 Terminal Portability Recommendation 1.571 (08/96) 3 STD.ITU-T RECMN I.57L-ENGL L77b m 4b259L b32794 05T m VSAT based I private network VSAT Very Small Aperture Terminal T T Customer I network 1- I 5 Reference configurations 5.1 VSAT networks represent a particular form of a private network. VSAT
49、 networks s,ouic Overall scenario for interconnection of VSAT networks to public ISDNs connected to the public ISDNs using the general principles and guidelines for the interworking of public and private ISDNs described in Recommendation 1.570, and as shown in Figure 1. NOTE 1 -The functional group customer network is described in Recommendation 1.41 1. NOTE 2 - If the VSAT network is null (.e, null NT2), the ISDN connection can be considered to end at coincident S and T reference points. NOTE 3 - If the customer network is an ISPBX-based network, providing the same ISDN c
