1、 International Telecommunication Union ITU-T G.763TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(03/2009) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Principal characteristics of transcoder and digital multiplication equipment Dig
2、ital circuit multiplication equipment using G.726 ADPCM and digital speech interpolation Corrigendum 1 Recommendation ITU-T G.763 (1998) Corrigendum 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.1
3、99 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 INTERC
4、ONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of voice and audio signals G.710G.729 Principal characteristics of
5、primary multiplex equipment G.730G.739 Principal characteristics of second order multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration
6、and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF
7、 SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recomm
8、endations. Rec. ITU-T G.763 (1998)/Cor.1 (03/2009) i Recommendation ITU-T G.763 Digital circuit multiplication equipment using G.726 ADPCM and digital speech interpolation Corrigendum 1 Summary Recommendation ITU-T G.763 is the specification for digital circuit multiplication equipment (DCME) and di
9、gital circuit multiplication systems (DCMS). This corrigendum provides the corrections previously identified in the ITU-T G.763 Implementors Guide. Source Corrigendum 1 to Recommendation ITU-T G.763 (1998) was approved on 16 March 2009 by ITU-T Study Group 16 (2009-2012) under Recommendation ITU-T A
10、.8 procedure. ii Rec. ITU-T G.763 (1998)/Cor.1 (03/2009) FOREWORD The International Telecommunication 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) i
11、s 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 Telecommunication Standardization Assembly (WTSA), which meets every four years,
12、 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 areas of information technology which fall within ITU-Ts purview, the necessa
13、ry standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, 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,
14、the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or 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 equiva
15、lents are used to express requirements. The use of such words does not suggest that compliance 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 cla
16、imed Intellectual Property Right. ITU takes 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, ITU had
17、received notice of intellectual property, protected by patents, which may be required to implement 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-
18、T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.763 (1998)/Cor.1 (03/2009) iii CONTENTS Page 1) Clause 3.2 a) . 1 2) Clause 3.2, Table 1 . 1 3) Clause 5.9.2 1 4) Clause 6.1.2 1 5)
19、Clause 15.1 . 2 Rec. ITU-T G.763 (1998)/Cor.1 (03/2009) 1 Recommendation ITU-T G.763 Digital circuit multiplication equipment using G.726 ADPCM and digital speech interpolation Corrigendum 1 1) Clause 3.2 a) Replace the paragraph: “Speech traffic is ADPCM encoded and subject to DSI. The bit rate of
20、individual bearer channels provided for speech is instantaneously either 32, 24, or 16 kbit/s, depending on traffic loading. If the 16 kbit/s overload feature is activated, the bit rate of the bearer channels provided for speech is 24 kbit/s or 16 kbit/s, depending on traffic loading.“ with: “Speech
21、 traffic is ADPCM encoded and subject to DSI. The bit rate of individual bearer channels provided for speech is instantaneously either 32, 24, or 16 kbit/s, depending on traffic loading (see also clauses 5.9.4, 5.9.5 and 5.9.6).“ 2) Clause 3.2, Table 1 Replace the Speech entry: “32 kbit/s ADPCM with
22、 DSI 24 and 16 kbit/s ADPCM with DSI“ with: “32, 24, and 16 kbit/s with DSI; 32 and 24 kbit/s with DSI; 24 and 16 kbit/s with DSI“ 3) Clause 5.9.2 Replace in the first paragraph the sentence: “The 5th bit (LSB) is obtained from a different bearer which is independently assigned as a bit bank.“ with:
23、 “The 5th bit (LSB) is obtained from a different bearer channel which is independently assigned as a bit bank.“ 4) Clause 6.1.2 Replace the paragraph: “Provisions shall be provided to maintain channel connectivity between page changes in the forward direction of a facsimile transmission and to relea
24、se the reverse channel connection between procedural signal transmissions so as to achieve a higher return link utilization for facsimile transmissions (this feature is also referred to as silence elimination).“ 2 Rec. ITU-T G.763 (1998)/Cor.1 (03/2009) with: “Provisions shall be provided to maintai
25、n channel connectivity between page changes in the forward direction of a facsimile transmission, and to release the reverse channel connection between procedural signal transmissions so as to achieve a higher return link utilization for facsimile traffic (this feature is also referred to as silence
26、 elimination). Encoding on the backward direction of a facsimile transmission shall start as data type; the second hangover time shall be used. The signal may then be reclassified as per the output of the voice/data discriminator process.“ 5) Clause 15.1 Add at the end of this clause: Optionally, pr
27、ovisions conforming to Rec. ITU-T G.776.3, ADPCM DCME configuration map report, can be provided to maintain higher interoperability among the DCME. Printed in Switzerland Geneva, 2009 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series
28、 E Overall network 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
29、 J Cable networks 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 ma
30、intenance 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 se
31、rvices 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
