ITU-T M.1375-1998
国际数据传输系统的维护-M系列:电信管理网和网络维护:国际传输系统,电话电路,电报,传真和租用线路
Maintenance of International Data Transmission Systems - Series M: TMN and Network Maintenance: International Transmission Systems Telephone Circuits Telegraphy Facsimile and Leased Circuits - International Data Transmission Study Group 4; 16 pp