1、 International Telecommunication Union ITU-T G.998.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 3(08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Ethernet-based multi-pair bonding Amendmen
2、t 3 Intentional temporary shutdown of some bonded lines Recommendation ITU-T G.998.2 (2005) Amendment 3 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOG
3、UE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDI
4、NATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Parameters for optical fibre cable system
5、s G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Digital line systems G.950G.959 Digital secti
6、on and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Metallic access networks G.990G.999MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS
7、G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.998.2 (2005)/Amd.3 (08/2013) i Re
8、commendation ITU-T G.998.2 Ethernet-based multi-pair bonding Amendment 3 Intentional temporary shutdown of some bonded lines Summary Amendment 3 to Recommendation ITU-T G.998.2 (2005) includes: A new clause 9 defining “intentional temporary shutdown of some bonded lines“ (new functionality). History
9、 Edition Recommendation Approval Study Group 1.0 ITU-T G.998.2 2005-01-13 15 1.1 ITU-T G.998.2 (2005) Amd. 1 2006-12-14 15 1.2 ITU-T G.998.2 (2005) Amd. 2 2007-12-07 15 1.3 ITU-T G.998.2 (2005) Amd. 3 2013-08-29 15 ii Rec. ITU-T G.998.2 (2005)/Amd.3 (08/2013) FOREWORD The International Telecommunica
10、tion Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff que
11、stions 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 years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendatio
12、ns 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 necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation,
13、 the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or
14、 applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance
15、with the Recommendation is required of any party. 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 ap
16、plicability 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, ITU had received notice of intellectual property, protected by patents, which may be required to implem
17、ent this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2014 All rights reserved. No part of this publication may be reproduced, by any mea
18、ns whatsoever, without the prior written permission of ITU. Rec. ITU-T G.998.2 (2005)/Amd.3 (08/2013) 1 Recommendation ITU-T G.998.2 Ethernet-based multi-pair bonding Amendment 3 Intentional temporary shutdown of some bonded lines 1) New clause 9 on “intentional temporary shutdown of some bonded lin
19、es“ Add a new clause 9 as follows: 9 Intentional temporary shutdown of some bonded lines Customer premises equipment (CPE) with bonded DSL may temporarily shut down some lines in a bonded group of lines while keeping at least one other line of the group in operation. This could be done to reduce the
20、 power consumption of the CPE to extend the operating duration of a back-up battery or to conserve energy during idle periods. The normal procedure for orderly shutdown of a DSL line may be used and later the DSL start-up procedure may be used when all lines need to be active. The orderly shutdown p
21、rocedure for VDSL2 is specified in clause 11.2.3.9 of ITU-T G.993.2 and for ADSL2/2plus in clauses 9.5.3.1 and 9.5.3.5 of ITU-T G.992.3. When a portion, but not all, of the lines in a bonded group is shut down using the orderly shutdown procedure and later their operation resumes, the bonded group s
22、hall remain in service, without interruption of transmission. Furthermore, the service management function for the DSL access multiplexer (DSLAM) or the associated element management system (EMS) may need to be aware of the intentional shutdown of some lines so as to avoid unnecessary service alarms
23、 due to the resulting reduced bit-rate of the bonded DSL group. A service alarm should be reported if all lines in a bonded group are shut down or if a line has a disorderly shut down. For ITU-T G.991.2, the behaviour in this situation is for further study. 2) Clause 2, References Add the following
24、new reference to clause 2: ITU-T G.993.2 Recommendation ITU-T G.993.2 (2011), Very high speed digital subscriber line transceivers 2 (VDSL2). 3) Clause 4, Abbreviations and acronyms Add the following new abbreviation to clause 4: EMS Element Management System Printed in Switzerland Geneva, 2014 SERI
25、ES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital syst
26、ems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection o
27、f cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and obje
28、ctive assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
