ETSI ETS 300 232-1993 传输和复用(TM).与同步数字体系(SDH)的设备与系统相关的光接口.ITU-T建议G.957(1993),修正本
Transmission and Multiplexing (TM); Optical Interfaces for Equipments and Systems Relating to the Synchronous Digital Hierarchy (ITU-T Recommendation G.957 (1993) Modified)