1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.998.2 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 4 (08/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Ethernet
2、-based multi-pair bonding Amendment 4 New Annex D Recommendation ITU-T G.998.2 (2005) Amendment 4 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 ANALOGUE CAR
3、RIER-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 COORDINATION
4、 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 systems G.91
5、0G.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 section and
6、 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.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.100
7、0G.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.4 (08/2015) i Recomme
8、ndation ITU-T G.998.2 Ethernet-based multi-pair bonding Amendment 4 New Annex D Summary Amendment 4 to Recommendation ITU-T G.998.2 (2005) includes: A new Annex D defining Ethernet bonding with DTU encapsulation (new functionality). History Edition Recommendation Approval Study Group Unique ID* 1.0
9、ITU-T G.998.2 2005-01-13 15 11.1002/1000/7090 1.1 ITU-T G.998.2 (2005) Amd. 1 2006-12-14 15 11.1002/1000/8996 1.2 ITU-T G.998.2 (2005) Amd. 2 2007-12-07 15 11.1002/1000/9169 1.3 ITU-T G.998.2 (2005) Amd. 3 2013-08-29 15 11.1002/1000/11998 1.4 ITU-T G.998.2 (2005) Amd. 4 2015-08-29 15 11.1002/1000/12
10、554 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.998.2 (2005)/Amd.4 (08/2015) FOREWORD The International Telecommunica
11、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
12、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
13、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,
14、 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
15、 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
16、with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 app
17、licability 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 impleme
18、nt 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 2015 All rights reserved. No part of this publication may be reproduced, by any mean
19、s whatsoever, without the prior written permission of ITU. Rec. ITU-T G.998.2 (2005)/Amd.4 (08/2015) 1 Recommendation ITU-T G.998.2 Ethernet-based multi-pair bonding Amendment 4 New Annex D 1) Clause 2 Add the following abbreviation in clause 2, in alphabetical order: DTU Data Transfer Unit 2) New A
20、nnex D Add a new Annex D on “Ethernet bonding with DTU encapsulation“ as follows: Annex D Ethernet bonding with DTU encapsulation (This annex forms an integral part of this Recommendation.) The specific normative requirements for DTU (data transfer unit) encapsulation are contained in the applicable
21、 ITU-T Recommendation for the underlying transport technology such as b-ITU-T G.9701 (G.fast). The exception to clause 61.2.2.5 of IEEE 802.3-2005 defined in clause 6.2.3 of this Recommendation is extended as follows (at the end of the paragraph before the Note): “The receiving PCS shall be able to
22、handle a total differential delay of 1 623 000 bit times (approximately 1.6 ms at 1 Gbit/s) without the need to stop traffic flow on any of the bonded lines in order to achieve reliable bonding operation. The receiving PCS shall be able to apply flow control to the underlying transport technology wh
23、en the PCS receive buffer is full.“. NOTE Some implementations may be able to handle a total differential delay higher than 1 623 000 bit times and achieve higher bonding efficiency. 3) Bibliography Add a bibliography after Annex D with the following entry: b-ITU-T G.9701 Recommendation ITU-T G.9701
24、 (2014), Fast access to subscriber terminals (G.fast) Physical layer specification. Printed in Switzerland Geneva, 2015 SERIES 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 operati
25、on and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programm
26、e and other multimedia signals Series K Protection against interference Series L Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network
27、maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph
28、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
