ITU-T G.731-1988 音频用基群脉冲编码调制(PCM)复用设备 Primary PCM multiplex equipment for voice frequencies

pdf标准 ITU-T G.731-1988 音频用基群脉冲编码调制(PCM)复用设备 Primary PCM multiplex equipment for voice frequencies

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ITU-T G.731-1988 音频用基群脉冲编码调制(PCM)复用设备 Primary PCM multiplex equipment for voice frequencies  第 1 页 ITU-T G.731-1988 音频用基群脉冲编码调制(PCM)复用设备 Primary PCM multiplex equipment for voice frequencies  第 2 页 ITU-T G.731-1988 音频用基群脉冲编码调制(PCM)复用设备 Primary PCM multiplex equipment for voice frequencies  第 3 页
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国外分类,ITU,ITU-T(电信标准分局),itu,音频,脉冲,编码,调制,pcm,复用,设备,primary,pcm,multiplex,equipment,for,voice,frequencies

INTERNATIONAL TELECOMMUNICATION UNION )45 4 ' TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU '%.%2!, !30%#43 /& $)')4!, 42!.3-)33)/. 3934%-3 4%2-).!, %15)0-%.43 02)-!29 0#- -5,4)0,%8 %15)0-%.4 &/2 6/)#% &2%15%.#)%3 )45 4 Recommendation ' (Extract from the "LUE "OOK) NOTES 1 ITU-T Recommendation G.731 was published in Fascicle III.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 Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. © ITU 1988, 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation G.731 Fascicle III.4 - Rec. G.731 PRIMARY PCM MULTIPLEX EQUIPMENT FOR VOICE FREQUENCIES (Geneva, 1972; further amended) The CCITT, considering that pulse code modulation (PCM) multiplex equipments are already used in various countries, in particular to provide a large number of short-distance telephone circuits on certain pairs in existing cables, and in order to minimize the number of different PCM multiplex equipments providing circuits which may be used in international connections, recommends that Administrations concerned should make their choice between the two primary PCM multiplex equipments described in Recommendations G.732 and G.733. Fascicle III.4 - Rec. G.731 1

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