Transmission and multiplexing (TM) - Optical interfaces for equipments and systems relating to the synchronous digital hierarchy (SDH) [ITU-T Recommendation G.957 (1995) modified] (Endorsement of the English version ETS 300232:1993 + A1:1996 as German standard)
传输和多路复用(TM).与同步数字体系(SDH)有关的设备和系统的光学接口[ITU-T建议G.957(1995)修改](认可英文版ETS 300232:1993+A1:1996作为德国标准)