1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU).4%2.!4)/.!,G0G0!.!,/5%G0G0#!22)%2G0G03934%-3%.%2!,G0G0#(!2!#4%2)34)#3G0G0#/-/.G0G04/G0G0!,!.!,/5%G0G0#!22)%2G1342!.3-)33)/.G0G03934%-3-!8)-5-G0G00%2-)33)“,%G0G06!,5%G0G0&/2G0G04(%!“3/,54%G0G00/7%2G0G0,%6%,G0G
2、0 0/7%22%&%22%$G0G04/G0G0/.%G0G0-),)7!44G9G0G0/&!G0G03).!,).G0G005,3%)45G134G0G0RecommendationG0G0 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation G.224 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
3、 might be slightly different 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 administ
4、ration and a recognized operating 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.224 1R
5、ecommendation G.224Fascicle III.2 - Rec. G.224MAXIMUM PERMISSIBLE VALUE FOR THE ABSOLUTE POWER LEVEL (POWER REFERRED TO ONEMILLIWATT) OF A SIGNALLING PULSE 1The CCITT recommends that, for crosstalk reasons, the absolute power level of each component of a shortduration signal should not exceed the va
6、lues given in Table 1/G.224.TABLE 1/G.224Maximum permissible value, at a zero relative level pointSignallingfrequency(Hz)Maximumpermissible powerfor a signal at a zerorelative level point(microwatts)Correspondingabsolute power levelDecibels referred to 1mW(dBm0)80012001600200024002800320075050040030
7、0250150150-1-3-4-5-6-8-8Note 1 - If the signals are made up of two different frequency components transmittedsimultaneously, the maximum permissible values for the absolute power levels are 3 dB below theabove values.Note 2 - The values given in this table result from a compromise between the characteristics ofvarious channel filters now in existence.Reference1 CCITT Recommendation Maximum permissible value for the absolute power level of a signalling pulse,Vol. VI, Rec. Q.16._1This Recommendation applies both to national and to international signalling systems.
