Routine Maintenance on International Group, Supergroup, Etc., Links - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits
Only measurements of the pilot level are made on international group, supergroup,etc.links.These do not involve other stations. Therefore,Administrations are free to decide on the methods and periodicities.In order to ensure that the performance limits of the links laid down in Recommendation M.160 are met,the following tests are recommended for consideration.