1、CEPT T/TPH*ZL*E 72 2326434 0030213 O W i Page 1 TTph21 E Recommendation T/Tph 21 (nie Hague 1972, revised Innsbruck 1981) PRINCIPLES OF RESTORATION FOR FAILED INTERNATIONAL SERVICES Recommendation proposed by the “Telephone Operation and Tariffs” Working Group T/WG 2 (Tph) Text of the Recommendation
2、 adopted by the “Telecommtmicatiois” Commission: “The European Conference of Postal and Telecommunications Administrations, considering - that in order to ensure a satisfactory telecommunications service between the CEPT member countries, allowing for the ever-increasing automation of the internatio
3、nal service, it is essential to establish a mutual aid service for the re-routing of international transmission links with minimum delay in the event of failures and planned interruptions, - that reserve facilities in the telecommunications network should be provided for this purpose, - that princip
4、les and guidelines for such a service should be established, - that studies are still continuing into the detailed development of a mutual aid service between CEPT members, - that the financial arrangements for restoration of interrupted services are under study (question PGT 15), O recommends that
5、CEPT member countries apply the following principles to achieve restoration of interrupted transmission links. 1. Designated line plant and terminal equipment should be provided for restoration. 2. In the event of failure or a planned interruption, responsibility for restoration should be based on t
6、he following principles : a) Interruptions of an international route occurring on a section of a national network, restoration would be the b) Interruptions occurring on an international section, restoration would be the responsibility of the two countries c) If complete restoration cannot be achiev
7、ed as stated in a) and b) arrangements for restoration would be the 3. The restoration should be performed at the highest possible transmission order (Master Group, Supergroup, etc.) 4. Complete restoration should, if possible, be provided. If this cannot be achieved, priorities will have to be give
8、n 5. In future, when providing new circuits, restoration requirements should be taken into account.” responsibility of the country concerned. concerned, even if other countries are involved. responsibility of the individual terminal countries using whatever routes were available. as far as this is possible in the network. to certain categories of circuits. O Edition of July 10, 1990 -
