1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 . TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0G0/&G0G0).4%2.!4)/.!,3/5.$G0G13G002/2!-%G0G0!.$G0G04%,%6)3)/.42!.3-)33)/.G0G0#)2#5)43-/.)4/2).G0G04(%G0G042!.3-)33)/.)45G134G0G0RecommendationG0G0. (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recom
2、mendation N.17 was published in Fascicle IV.3 of the Blue Book. This file is an extract from theBlue 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 conditions rem
3、ain 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 any form o
4、r by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.3 - Rec. N.17 1Recommendation N.17Fascicle IV.3 - Rec. N.17MONITORING THE TRANSMISSIONThe transmission may be monitored in the terminal ISPCs by means of loudspeakers
5、 and/or apparatus with avisual display (peak programme meters, vu-meters, oscilloscopes, etc.). The means for monitoring the transmissionshould allow both visible and audible indications.Digital sound-programme circuits established on 2048 kbit/s systems include a sound-programme signallingchannel, allowing the exchange of service information, for example: transmission timing, identification signal, type of sound-programme circuit carried.These will be decoded by appropriate devices to determine the elements for charging as required inRecommendation N.18.
