1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).#,!53%3G0G0!00,)#!“,%G0G04/G0G0)45G134G0G034!.$!2$3934%-3!,!2-3G0G0&/2G0G04%#(.)#!,G0G034!&G0G0!.$!22!.%-%.43G0G0).G0G0#!3%G0G0/&G0G0&!5,43
2、)45G134G0G0RecommendationG0G01 (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation Q.117 was published in Fascicle VI.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
3、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 operating agency. ITU 1988, 1993All rights re
4、served. 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 VI.1 - Rec. Q.117 1Recommendation Q.117Fascicle VI.1 - Rec. Q.1174.2 ALARMS FOR TECHNICAL
5、STAFF AND ARRANGEMENTSIN CASE OF FAULTS4.2.1 In general, when an abnormal condition is recognized as being possibly due to a fault, an alarm must begiven to indicate this condition and, if possible, any other necessary operation must be carried out to avoid circuitsbeing put out of service unnecessa
6、rily and to facilitate fault tracing.4.2.2 There will be the usual alarm and fault indication arrangements for such items as blown fuses, disconnectedheat coils, faulty signalling equipment, failures of power supplies, failures of common control equipment, etc., asprovided under the specifications o
7、f each Administration.4.2.3 The occupation of each item of equipment such as line circuit equipment, link circuit, operators callingequipment, selectors, registers, etc., can be indicated by the lighting of a lamp near to the equipment concerned, or byother suitable means, as may be available, e.g.
8、in exchanges with stored-programme control.4.2.4 It can be arranged for the progress of a call to be followed, in particular the sending or reception of digits orsuccessive numerical signals. In this respect, each Administration will decide the arrangements it desires to install,taking account of the practice which it normally follows in this matter.
