ITU-T G 421-1993 METHODS OF INTERCONNECTION《互连方法》.pdf
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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%2.!4)/.!,G0G0!.!,/5%G0G0#!22)%2G0G03934%-3%.%2!,G0G0#(!2!#4%2)34)#3G0G0/&G0G0).4%2.!4)/.!,#!22)%2G0G04%,%0(/.%G0G03934%-3G0G0/.2!$)/G0G13G02%,!9G0G0/2G0G03!4%,)4%G0G0,).+3G0G0!.$).4%2#/%#4)/.G0G07)4(G0G0-%4
2、!,)#G0G0,).%3-%4(/$3G0G0/&G0G0).4%2#/%#4)/.)45G134G0G0RecommendationG0G0 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation G.421 was published in Fascicle III.2 of the Blue Book. This file is an extract fromthe Blue Book. While the presentation and layout of the text might be slightly differe
3、nt from the Blue Book version, thecontents 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 atelecommunication administration and a recognized op
4、erating agency. ITU 1988, 1993All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle III.2 - Rec. G.421 1Recommendation G.421Fascicl
5、e III.2 - Rec. G.421METHODS OF INTERCONNECTIONIn studying the interconnection of radio-relay systems, either with one another or with systems on metallic lines,distinction should be made between the following cases:1 Interconnection at audio-frequenciesThis is the normal method, at the present stage
6、 of technical development, whenever a radio-relay system usingtime-division multiplex is involved1). Operational requirements may be such that it is also necessary in the case offrequency-division multiplex and of systems on metallic lines.2 Interconnection by through-group connectionWith present te
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