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1、5iMONTAGE: REC.722 EN-T | TE DE CETTE PAGERecommendation M.723CIRCUIT CONTROL STATION1Definition of circuit control stationThe circuit control station is the point within the general maintenance organization for the international automaticand semi-automatic telephone service that fulfils the control
2、 responsibilities for the automatic circuits assigned to it.The responsibilities, functions and criteria for appointing circuit control stations given in 2 to 4 below apply to circuits provided solely by analogue transmission and switching systems and those involving a mixture of analogue and digita
3、l systems2ResponsibilitiesThe circuit control station is responsible for ensuring that an automatic circuit assigned to it is set up and main- tained to the required standards in both directions of transmission and that, if the circuit fails, the outage time is kept to a minimum.3Functions3.1 Arrang
4、ing for the setting-up of the circuit, and of the signalling and switching equipment associated directly with the circuit, and the related adjustment.3.2 Controlling lining-up measurements to within the recommended limits.3.3 Ensuring that routine maintenance measurements and tests are carried out i
5、n accordance with the agreedschedule using the specified methods and in such a way that interruptions to service are limited to the shortest possible duration.3.4 Requesting that the circuit sub-control station take action as required.3.5 Arranging for the blocking of circuits as required.3.6 Ensuri
6、ng that fault location and clearing is carried out by the responsible testing point and/or maintenance unit in a proper manner.3.7 Initiating investigation of repeated circuit faults.3.8 Controlling the withdrawal of circuits from service.3.9 Controlling the return of circuits to service, after the
7、fault clearance.3.10 Being continuously informed of the condition of the automatic circuits under its control.Fascicle IV.1 Rec. M.72313.11 Keeping up to date records of the routing of the automatic circuits under its control.3.12 Knowing what are the possibilities of rerouting any faulty circuits a
8、nd making arrangements for such rerout- ings where necessary.4Appointment of circuit control stationsA circuit control station is appointed for each international circuit used for the automatic and semi- automatic tele- phone service. When the circuit is operated unidirectionally the circuit control
9、 station isgenerally at the outgoing end. When the circuit is operated both-way, the circuit control station can be at either end by common agreement between the technical services of the Administrations concerned. In making the choice, spe- cial consideration will be given to:whether the location t
10、o 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.Recommendation M.724CIRCUIT SUB-CONTROL STATION1Definition of circuit sub-control stationThe circuit sub-control sta
11、tion is a point within the general maintenance organization for the internationalautomatic and semi-automatic telephone service that assists the circuit control station and fulfils the control responsibili- ties for a circuit section assigned to it.The responsibilities, functions and criteria for ap
12、pointing circuit sub-control stations given in 2 to 4 below apply to circuits provided solely by analogue transmission and switching systems and those involving a mixture of analogue and digital systems2ResponsibilitiesIt is the responsibility of the circuit sub-control station to inform the circuit
13、 control station about all noted events likely to affect the circuit under their control. If the circuit sections are assigned to the circuit sub-control for the purpose of controlling them, the circuit sub-control is responsible for these circuit sections in the same way as the circuit control stat
14、ion is for the complete circuit.3Functions3.1 Performing the control functions for circuit sections, especially national sections, as given for the circuit con- trol station.2 Fascicle IV.1 Rec. M.7243.2 Cooperating with the circuit control station and other circuit sub-control stations in ensuring
15、that routine maintenance fault location and clearance are carried out by the responsible testing points and/or maintenance units in a proper manner.3.3 Arranging that all relevant details concerning the location and subsequent clearance of faults are reported to the fault report point (circuit) at t
16、he controlling end.Fascicle IV.1 Rec. M.72434Appointment of circuit sub-control stationsFor each circuit used for the automatic and semi-automatic telephone service a terminal circuit sub-control station is appointed. This is generally the end of the circuit remote from the circuit control station. In transit countries in which a circuit is brought to audio frequencies, an intermediate circuit sub-control station is appointed at a suitable point for each direction of transmissio
