1、 INTERNATIONAL TELECOMMUNICATION UNION CCITT Series GTHE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE Supplement 31(11/1988) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS General aspects of digital transmission systems; terminal equipments Other terminal equi
2、pments STATUS OF WORK OF PRESENTLY CONSIDERED DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) DOCUMENTS Reedition of Supplement 31 to CCITT G-Series Recommendations published in the Blue Book, Fascicle III.4 (1988) NOTES 1 Supplement 31 to CCITT G-Series Recommendations was published in Fascicle III
3、4 of the Blue Book. This file is an extract from the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, the contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below). 2 In this Reco
4、mmendation, the expression Administration is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. ITU 1988, 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of
5、 ITU. Fascicle III.4 Supplement 31 1 Supplement No. 31 STATUS OF WORK OF PRESENTLY CONSIDERED DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT (DCME) DOCUMENTS (Melbourne, 1988) (referred to in Recommendation G.763) The intent is to achieve a single comprehensive DCME Recommendation based on the current wor
6、k of various Administrations, recognized private operating agencies and recognized standards bodies. Consideration is being given to make the CCITT Recommendation on DCME applicable to all circumstances where DCME is required (i.e. cable and satellite, various signalling protocols, etc.). It will be
7、 of such detail that equipment conforming to it, but obtained from different design sources, would work together satisfactorily within a single system. Documents important to the study of a detailed DCME Recommendation (planned and available) include: INTELSAT A detailed specification INTELSAT earth
8、 station standards (IESS) (Document IEES-501 Rev.1) digital circuit multiplication equipment specification, 32 kbit/s ADPCM with DSI, (15 March 1988) has been approved and issued by the INTELSAT Board of Governors. France Contribution to Study Group XV, April 1988, Description of a bearer frame form
9、at and associated assignment channel used in the CELTIC-3G DCMS, and performance evaluation (which incorporates a 2 bit overload strategy on speech signals). EUTELSAT Detailed EUTELSAT specification (Document BS14-49), DCME specification, 32 kbit/s ADPCM and DSI, May 1988, approved by the EUTELSAT B
10、oard of Signatories (Note 1). Committee T1 Digital circuit multiplication equipment interworking standard, under study with draft standard scheduled for submission for voting at the end of 1988 (Note 2). Note 1 This specification is based in a large part on the INTELSAT specification IESS-501 Rev.1
11、with modifications and additions appropriate to the European: countries (particularly R2D signalling system accomodation). Note 2 The current draft is based in large part on the INTELSAT specification IESS-501, 16 September 1987, with modifications appropriate to the US national situation. Printed i
12、n Switzerland Geneva, 2007 ITU-T RECOMMENDATIONS SERIES Series A Organization of the work of the ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone ser
13、vice, 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 Transmission of television, sound progra
14、mme 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 TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased ci
15、rcuits Series 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 Serie
16、s 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 and open system communications Series Y Global information infrastructure and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems
