ITU-T G.411-1988 国际电话电路中无线接力系统的应用 Use of radio-relay systems for international telephone circuits

pdf标准 ITU-T G.411-1988 国际电话电路中无线接力系统的应用 Use of radio-relay systems for international telephone circuits

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ITU-T G.411-1988 国际电话电路中无线接力系统的应用 Use of radio-relay systems for international telephone circuits  第 1 页 ITU-T G.411-1988 国际电话电路中无线接力系统的应用 Use of radio-relay systems for international telephone circuits  第 2 页 ITU-T G.411-1988 国际电话电路中无线接力系统的应用 Use of radio-relay systems for international telephone circuits  第 3 页
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国外分类,ITU,ITU-T(电信标准分局),itu,国际,电话,电路,无线,接力,系统,应用,use,of,radio,relay,systems,for,international,telephone,circuits

INTERNATIONAL TELECOMMUNICATION UNION )45 4 ' TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU ).4%2.!4)/.!, !.!,/'5% #!22)%2 3934%-3 '%.%2!, #(!2!#4%2)34)#3 /& ).4%2.!4)/.!, #!22)%2 4%,%0(/.% 3934%-3 /. 2!$)/ 2%,!9 /2 3!4%,,)4% ,).+3 !.$ ).4%2#/..%#4)/. 7)4( -%4!,,)# ,).%3 53% /& 2!$)/ 2%,!9 3934%-3 &/2 ).4%2.!4)/.!, 4%,%0(/.% #)2#5)43 )45 4 Recommendation ' (Extract from the "LUE "OOK) NOTES 1 ITU-T Recommendation G.411 was published in Fascicle III.2 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.411 Fascicle III.2 - Rec. G.411 USE OF RADIO-RELAY SYSTEMS FOR INTERNATIONAL TELEPHONE CIRCUITS The CCITT unanimously recommends1) that, between fixed points, telephone communications should be effected wherever possible by means of metallic conductors or radio-relay links using frequencies above 30 MHz to make the allocation of radio-frequencies less difficult and, where this can be realized, the objective should be to attain the transmission performance recommended by the CCITT for international telephone circuits on metallic conductors. Reference [1] CCIR Recommendation Use of radio links in international telephone circuits, Vol. III, Rec. 335, Dubrovnik, 1986. _______________ 1) This Recommendation is the same as an extract from CCIR Recommendation 335 [1]. Fascicle III.2 - Rec. G.411 1

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