1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 2 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(94%,%2!0(G0G042!.3-)33)/./2!.):!4)/.G0G0/ amended 1951 and at Geneva, 1956)The CCITT,consideringthat, in order to ensure satisfactory cooperation between Administrations and private telegraph operatin
2、gagencies interested in the maintenance of international telegraph circuits, and in order to ensure the maintenance ofsatisfactory transmission in the international telegraph service, it is necessary to unify the essential action to be takenfor the establishment and maintenance of international tele
3、graph circuits,unanimously declares the view1 Periodical maintenance measurements should be taken on international voice-frequency telegraph (VFT)systems, and documents relating to such measurements should be exchanged.2 The responsibilities for the maintenance of satisfactory transmission, and (as
4、and when necessary) the removalof faults on an international VFT system should be assumed by one of the terminal stations of the system to be knownas the system control station. The said station is to be appointed for the purpose by the Administrations and privatetelegraph operating agencies concern
5、ed on the occasion of the establishment of the VFT system concerned. The systemcontrol station is to be entrusted with coordination of the execution of the maintenance measurements to which 1above relates.3 The responsibilities for the maintenance of satisfactory transmission, and (as and when neces
6、sary) the removalof faults on an international telegraph system should be allocated between the different stations concerned as indicatedbelow.3.1 One station of the circuit should assume the principal responsibility for the maintenance of satisfactory serviceon the circuit. The station in question
7、should be known as the control station.3.2 This station should be equipped with testing equipment to enable it to make telegraph transmissionmeasurements and in this connection it exercises an executive control over all the other stations on the circuit.3.3 It should be appointed by agreement betwee
8、n the Administrations concerned on the occasion of theestablishment of the telegraph circuits concerned. It should be, wherever possible, one of the terminal stations of thecircuit, save in so far as otherwise agreed by the services concerned. For example, in the case of VFT circuits, thecontrol sta
9、tion should be one of the terminal VFT stations as nominated by common agreement between theAdministrations concerned.3.4 The control station is responsible for coordinating all operations required when there is a breakdown in thecircuit. It keeps a record of all circuit breakdowns. To facilitate su
10、pervision, a reference number must be allocated toeach breakdown reported.3.5 When a fault comes to the notice of another station on the circuit, this station should take steps to securesuitable action on the part of other stations concerned; but the control station is nevertheless responsible for e
11、nsuringthat the fault is cleared as soon as possible.3.6 The control station should be in a position to furnish all requisite information in reply to inquiries on the subjectof faults e.g. in regard to the time of any fault, the location of the fault, the orders given for dealing with it and thetime
12、s of restoration of the circuit.2 Fascicle VII.1 - Rec. R.713.7 In order, however, to increase the flexibility of the organization and the rapidity of the removal of faults, thecontrol station will confine itself in each foreign country to securing the cooperation of a station to be known as thesub-
13、control station of the circuit. The sub-control station should assume, within its own territory, the responsibilitiesindicated above in the case of the control station and should therefore be equipped with testing equipment to enable itto make telegraph transmission measurements. Such delegation of
14、responsibility shall not affect the authority of thecontrol station, with which the primary responsibility for the maintenance of satisfactory service on the circuit willcontinue to rest.3.8 The sub-control station shall be appointed by the technical service of the Administration concerned. It shall
15、furnish detailed information to the control station regarding faults occurring in its own country.4 Administrations or private recognized telegraph operating agencies shall be free to organize the maintenancemeasurements on those portions of international point-to-point circuits and switched connect
16、ions (including apparatus)that lie wholly within their control, but the methods adopted should be not less efficacious than those recommended forinternational circuits.5 To facilitate the control of tests, circuits shall be divided into test sections (parts of a circuit between twotelegraph stations
17、). Each section shall be under the control of a testing station responsible for the localization andremoval of faults on the section concerned. The testing station shall furnish detailed information as to the faultsoccurring in the section under its control to the sub-control station (or, if necessary, the control station).6 In the case of VFT channels, each channel shall constitute a test section. The testing station will in this case bethe principal VFT station at the end of the section concerned.
