1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.983.4TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(01/2005) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access networks A broadband op
2、tical access system with increased service capability using dynamic bandwidth assignment Corrigendum 1 ITU-T Recommendation G.983.4 (2001) Corrigendum 1ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.
3、199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE 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 INTER
4、CONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA 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 fo
5、r optical fibre cable systems 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 syst
6、ems G.950G.959 Digital section 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 Access networks G.990G.999 QUALITY OF SERVICE AND PERFORMANCE - GENERIC AND USER-RELAT
7、ED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.983.4 (2001)/Cor.1 (01/2005) i ITU-T Recommendation G.983.4 A broadband
8、optical access system with increased service capability using dynamic bandwidth assignment Corrigendum 1 Summary This corrigendum to ITU-T Rec. G.983.4 (11/2001) specifies revised code points in a divided slot to report the number of accumulated cells in T-CONT buffer. This corrigendum applies to B-
9、PON with Dynamic Bandwidth Assignment (DBA). Source Corrigendum 1 to ITU-T Recommendation G.983.4 (2001) was approved on 13 January 2005 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.983.4 (2001)/Cor.1 (01/2005) FOREWORD The International Telecommu
10、nication Union (ITU) is the United Nations specialized agency in the field of 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
11、 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 Recommendations on these topics. The approval of ITU-T Recom
12、mendations 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, the expression “Administration“ is used for co
13、nciseness 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 applicability) and compliance with the Recommend
14、ation 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 with the Recommendation is required of any party.
15、 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 Intellectual Property Righ
16、ts, 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. However, implementors ar
17、e cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.983.4 (2
18、001)/Cor.1 (01/2005) 1 ITU-T Recommendation G.983.4 A broadband optical access system with increased service capability using dynamic bandwidth assignment Corrigendum 1 Clause 8.3.5.10.1.3.3, Report field coding and Table 3 Replace the text and table of this clause with the following: The default mi
19、nislot format is shown in Figure 16 in 8.3.5.10.1.3.2. The reported 1 byte queue length is the non-linear coded value of the actual number of cells in a T-CONT of a specific ONU/ONT. The mapping between the number of cells (the input), the 1 byte value (the code) and the decoded message (the output)
20、 is given in Table 3 as default code points. Note that the decoded output is effectively rounded up to the largest value that could have resulted in that particular code point. This property ensures that the coding error is always positive. Table 3/G.983.4 Non-linear coding for report field of minis
21、lot Queue Length Binary Input (ONU/ONT) Coding of octet (minislot) Binary Output (OLT) 0-127 00000000abcdefg 0abcdefg 00000000abcdefg128-255 00000001abcdefx 10abcdef 00000001abcdef1256-511 0000001abcdexxx 110abcde 0000001abcde111512-1023 000001abcdxxxxx 1110abcd 000001abcd111111024-2047 00001abcxxxx
22、xxx 11110abc 00001abc11111112048-4095 0001abxxxxxxxxx 111110ab 0001ab1111111114096-8191 001axxxxxxxxxxx 1111110a 001a111111111118191 010000000000000: 11111111111111111111110 011111111111111Invalid N/A 11111111 N/AThe code point described in Table 3 may be changed according to the service situation a
23、nd the implementation of OLTs and ONUs/ONTs. However, alternative code points have not been specified in this Recommendation. NOTE Invalid code (0xFF) indicates that ONU/ONT cannot report the actual number of cells for the T-CONT. However, in this case, OLT recognizes the arrival of a minislot for t
24、he T-CONT. Although the bandwidth update mechanism in this case is beyond the scope of this Recommendation, LOMSi is not generated. Printed in Switzerland Geneva, 2005 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall netwo
25、rk operation, telephone service, service operation 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 network
26、s and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series
27、 N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks 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
