Customers using international leased circuits, have ever increasing demands for - faster installation times, and consequent need for cooperation between Administrations to achieve required in-service dates
ITU-T M.1560-1992由国际电信联盟 IX-ITU 发布于 1992-01-01。
ITU-T M.1560-1992 在中国标准分类中归属于: M19 通信网设备互通技术要求和通信网接口。
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