ITU-T M.1220-1989 标准详情
- 标准号：ITU-T M.1220-1989
- 中文标题：
- 英文标题：Network Maintenance Information - Maintenance of International Telegraph, Phototelegraph and Leased Circuits - Maintenance of the International Public Telephone Network - Maintenance of Maritime Satellite and Data Transmission Systems (Study Group IV
- 标准类别：国际电信联盟标准
- 发布日期：1989-01-01
