ITU-T G 995 1-2001 Overview of Digital Subscriber Line (DSL) Recommendations Series G Transmission Systems and Media Digital Systems and Networks Digital Sections and Digital Line .pdf
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1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.995.1 (02/2001) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system - Access networks Overview of digital subscriber line (DSL) Recommendations IT
2、U-T Recommendation G.995.1 (Formerly CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU G.995.1 (02/200 1 ) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system - Access networks
3、 Overview of digital subscriber line (DSL) Recommendations ITU-T Recommendation G.995.1 (Formerly CCITT Recommendation) ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS TRANSMISSION SYSTEMS GENERAL CHARACTERI
4、STICS COMMON TO ALL ANALOGUE CARRIER- INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TESTING EQUIPMENTS TRANSMISSION MEDIA CHARACTERIST
5、ICS DIGITAL TERMINAL EQUIPMENTS DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH Gen er a 1 Parameters for optical fibre cable systems Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s Digital lin
6、e transmission systems on cable at non-hierarchical bit rates Digital line systems provided by FDM transmission bearers Digital line systems Digital section and digital transmission systems for customer access to ISDN Optical fibre submarine cable systems Optical line systems for local and access ne
7、tworks Access networks G.1004.199 G.200-G.299 G.300-G.399 G.400-G.449 G.4504.499 G.500-G.599 G.600-G.699 G.700-G.799 G.800-G.899 G.900-G.999 G.900-G.909 G.9 1 O-G.9 1 9 G.920-G.929 G.930-G.939 G.940-G.949 G.950-G.959 G.9604.969 G.970-G.979 G.980-G.989 G.99-G.999 For further details, please refer to
8、the list of ITU-T Recommendations ITU-T Recommendation 6.995.1 Overview of digital subscriber line (DSL) Recommendations Summary This Recommendation provides the necessary guidance and an overview of the DSL family of Recommendations and is therefore informative. It also describes how the various Re
9、commendations in this family are related. It also contains a definition of a generic system reference configuration and how it relates to the system reference models of the DSL Recommendations. Additionally, the definition of a generic protocol reference architecture for DSL Recommendations and deri
10、vations of the appropriate user or management plane protocol reference architectures for the DSL Recommendations is included. Illustrations of the data service presentation options using the DSL Recommendations are also provided. A glossary of the terms used in the DSL Recommendations is also includ
11、ed. Source ITU-T Recommendation G.995.1 was revised by ITU-T Study Group 15 (2001-2004) and approved under the WTSA Resolution 1 procedure on 9 February 2001. ITU-T G.995.1 (02/2001) 1 .FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
12、telecommunications. The ITU Telecommunication Standardization Sector (ITU-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 Te
13、lecommunication Standardization Assembly (WTSA), which meets every four 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
14、 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 conciseness to indicate both a telecommunication administration and a recognized
15、 operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the 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 Intellec
16、tual Property Rights, whether asserted by ITU members or others outside 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. Howeve
17、r, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2002 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, inclu
18、ding photocopying and microfilm, without permission in writing from ITU. 11 ITU-T G.995.1 (02/2001) CONTENTS 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 6 6.1 6.2 7 7.1 7.2 8 Scope . Revision History . Definitions Abbreviations Overview of the Family of DSL Recommendations ITU-T G.992.1: Asymmetric Di
19、gital Subscriber Line (ADSL) Transceivers ITU-T G.992.2: Splitterless asymmetrical digital subscriber line (ADSL) transceivers . ITU-T G.991.1: High bit rate digital subscriber line (HDSL) transceivers ITU-T G.991.2: Single-pair High-speed Digital Subscriber Line (SHDSL) transceivers . ITU-T G.994.1
20、: Handshake procedures for digital subscriber line (DSL) transceivers . ITU-T G.997.1: Physical layer management for digital subscriber line (DSL) transceivers . ITU-T G.996.1: Test procedures for digital subscriber line (DSL) transceivers Relationship among the DSL Recommendations . The Reference C
21、onfiguration for ITU-T G.99-series Recommendations Generic Reference configuration . Relation of the Generic Reference Configuration to the ITU-T G.99- series Recommendations . 6.1.1 Reference Layered Protocol Architecture for ITU-T G.99 Recommendations Illustration of Data Service Using DSL Recomme
22、ndations . End-To-End Data-Centric Connection . Illustration of Service Presentation Options . 7.2.1 Service Presentation at the T interface 7.2.2 Service Presentation at the U interface Glossary of Terms in DSL Recommendations . Appendix I . Bibliography ITU-T G.995.1 (02/2001) Page 1 1 1 1 3 3 4 5
23、 6 7 7 7 7 9 9 10 17 21 21 22 22 23 25 27 . 111 ITU-T Recommendation G.995.1 Overview of digital subscriber line (DSL) Recommendations 1 Scope This Recommendation provides an overview of the family of DSL Recommendations. It describes how the various DSL Recommendations are related. This Recommendat
24、ion also defines a generic system reference and a protocol reference configuration for DSL Recommendations and relates it to the system reference models of the DSL Recommendations. This Recommendation is of informative nature and does not imply any specific requirements. 2 Revision History This revi
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