1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0 ).4%2.!4)/.!,G0G042!.3-)33)/.G0G03934%-3!.!,/5%G9.5-“%2).G0G0).G0G02!$)/G132%,!9G0G0,).+3/2G0G0/0%.G137)2%G0G0,).%G0G03934%-3)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 IT
2、U-T Recommendation M.400 was published in Fascicle IV.1 of the Blue Book. This file is an extract fromthe Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, thecontents of the file are identical to the Blue Book version and copyright cond
3、itions remain unchanged (see below).2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both atelecommunication administration and a recognized operating agency. ITU 1988, 1993All rights reserved. No part of this publication may be reproduced or utilized in
4、any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.400 1Recommendation M.400Fascicle IV.1 - Rec. M.400NUMBERING IN RADIO-RELAY LINKS OR OPEN-WIRE LINE SYSTEMSFor numbering in a radio-relay link us
5、ing frequency division multiplex, the channels, groups,supergroups, etc., are considered in the position they occupy in the baseband to be transmitted by that link.In the interests of direct interconnection the CCIR and CCITT have collaborated in drawing upRecommendation G.423 1 from which it follow
6、s that the numbering of the telephony channels, groups andsupergroups, etc., of the radio-relay link is as described in Recommendations M.320 to M.390.The same rules are applied to carrier systems on open-wire lines providing at least one group having12 telephone channels.Reference1 CCITT Recommendation Interconnection at the baseband frequencies of frequency-division multiplex radio-relay systems, Vol. III, Rec. G.423.
