1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)434%34).G0G00/).4G0G0 37)4#().!.$G0G0).4%22%)34%2G0G03).!,).G9)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.719 was
2、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 conditions remain unchanged (see
3、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 or by any means, ele
4、ctronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.719 1Recommendation M.719Fascicle IV.1 - Rec. M.719TESTING POINT (SWITCHING AND INTERREGISTER SIGNALLING)1 Definition of testing point (switching and interregister signalling
5、)The testing point (switching and interregister signalling) is an element within the general maintenanceorganization for the international automatic and semi-automatic telephone service at each international centre. It carriesout tests concerned with switching and interregister signalling functions
6、associated with international circuits, whetherprovided by wholly analogue transmission and switching systems or by a mixture of analogue and digital systems1).Administrations may organize testing of equipment and functions for common channel signalling systemseither at the testing point or at a sep
7、arate point. Attention is drawn to Recommendation M.762 regarding commonchannel signalling system maintenance.2 Responsibilities and functionsThe testing point (switching and interregister signalling) is responsible for the following set of functions:2.1 Carrying out switching and interregister sign
8、alling tests in connection with the setting-up and lining-up ofinternational circuits.2.2 Taking any necessary action as a result of outputs from supervisory and testing functions of SPC exchanges.2.3 Ensuring that new circuits can be accessed via the switching equipment, and that auxiliary equipmen
9、t(e.g. accounting equipment, ATME) is correctly associated.2.4 Carrying out routine tests of the switching and interregister signalling entities.2.5 Diagnostic testing to confirm existence and location of switching and interregister signalling problemsindicated by monitorial equipment or fault repor
10、ts.2.6 Passing details of the locations of faults to the appropriate maintenance units for clearance and cooperatingwith them as necessary.2.7 Advising the fault report point (network) and the network management (implementation and control point) (seeRecommendation E.413 1) of any problems which may
11、 affect service on a route or routes and the action taken.2.8 Advising the circuit control station of any difficulties detected by routine tests or monitorial means whichaffect individual circuits.2.9 Cooperating with staff in other international centres as required.3 FacilitiesThe testing point (sw
12、itching and interregister signalling) should be provided with the following facilities:3.1 Ability to test common equipment elements for performance and/or availability.3.2 Access to information from internal or external supervisory testing functions of SPC exchanges._1)In practice, at digital inter
13、national exchanges, a line access point at circuit level may not exist when the exchange is interfaced byprimary (or higher order) digital paths. Thus, all signalling testing may need to be carried out from one location, generally thetesting point) switching and interregister signalling). This would
14、 include line signalling aspects, if any.2 Fascicle IV.1 - Rec. M.7193.3 Means for assessing switching capability and interregister signalling in accordance with Annex A.3.4 Communication with other maintenance entities as appropriate.3.5 Access to maintenance access lines as described in Recommenda
15、tion O.11 2.3.6 For common channel signalling systems, access to information on signalling link status and signalling routing,and from signalling performance monitoring equipment.ANNEX A(to Recommendation M.719)Measuring and testing equipment (signalling and switching)The basic types of equipment ne
16、eded by a testing point (switching and interregister signalling) are as follows:1) equipment for signalling tests;2) equipment for switching tests;3) signalling encoders consisting of a signal generator with facilities to vary frequency, amplitude and timingwithin defined limits, in conjunction with
17、 a test call generator, so that test calls using nominal or marginalsignals can be generated;4) signal decoders, i.e. a device capable of responding to incoming signals such as to indicate whether or notthe received signals are within limits;5) signal displays, i.e. a device capable of displaying th
18、e signals, line or register, transmitted or received by acircuit. The display should preferably be in digital form;6) signal timers, i.e. a device capable of measuring the length of signals and the interval between signals(line and register) transmitted or received over a circuit;7) signal level mea
19、suring device;8) signal distortion measuring device;9) signal recording device, for permanent records of line and register signals.Further details of equipment for testing switching and interregister signalling are given in the relevantRecommendations on the different signalling systems.References1 CCITT Recommendation International network management-Planning, Vol. II, Rec. E.413.2 CCITT Recommendation Maintenance access lines, Vol. IV, Rec. O.11.
