1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 - TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#% ).4%2.!4)/.!,G0G04%,%0(/.%G0G0#)2#5)43#)2#5)4G0G0#/.42/,G0G034!4)/.)45G134G0G0RecommendationG0G0- (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation M.723 was published in Fascicle IV.1 of t
2、he 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 below).2 In this Recommendation
3、 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, electronic ormechanical, including
4、 photocopying and microfilm, without permission in writing from the ITU.Fascicle IV.1 - Rec. M.723 1Recommendation M.723Fascicle IV.1 - Rec. M.723CIRCUIT CONTROL STATION1 Definition of circuit control stationThe circuit control station is the point within the general maintenance organization for the
5、 internationalautomatic and semi-automatic telephone service that fulfils the control responsibilities for the automatic circuits assignedto it.The responsibilities, functions and criteria for appointing circuit control stations given in 2 to 4 below applyto circuits provided solely by analogue tran
6、smission and switching systems and those involving a mixture of analogueand digital systems.2 ResponsibilitiesThe circuit control station is responsible for ensuring that an automatic circuit assigned to it is set up andmaintained to the required standards in both directions of transmission and that
7、 if the circuit fails, the outage time is keptto a minimum.3 Functions3.1 Arranging for the setting-up of the circuit, and of the signalling and switching equipment associated directlywith the circuit, and the related adjustment.3.2 Controlling lining-up measurements to within the recommended limit
8、s.3.3 Ensuring that routine maintenance measurements and tests are carried out in accordance with the agreedschedule using the specified methods and in such a way that interruptions to service are limited to the shortest possibleduration.3.4 Requesting that the circuit sub-control station take actio
9、n as required.3.5 Arranging for the blocking of circuits as required.3.6 Ensuring that fault location and clearing is carried out by the responsible testing point and/or maintenance unitin a proper manner.3.7 Initiating investigation of repeated circuit faults.3.8 Controlling the withdrawal of circu
10、its from service.3.9 Controlling the return of circuits to service, after the fault clearance.3.10 Being continuously informed of the condition of the automatic circuits under its control.3.11 Keeping up to date records of the routing of the automatic circuits under its control.3.12 Knowing what are
11、 the possibilities of rerouting any faulty circuits and making arrangements for suchreroutings where necessary.4 Appointment of circuit control stationsA circuit control station is appointed for each international circuit used for the automatic and semi-automatictelephone service. When the circuit i
12、s operated unidirectionally the circuit control station is generally at the outgoingend. When the circuit is operated both-way, the circuit control station can be at either end by common agreementbetween the technical services of the Administrations concerned. In making the choice, special consideration will begiven to: whether the location to be nominated as the circuit control station is permanently attended, the amount of work at each terminal point, the length of the circuit within the territory of each terminal country.
