The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
ITU-T Q.957-1993由国际电信联盟 IX-ITU 发布于 1993-01-01。
ITU-T Q.957-1993 在中国标准分类中归属于: M38 数字通信设备。
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