電機工程學系 ; A flexible architecture is proposed for implementing SDH STM-1 add-drop multiplexers (ADM-150). This system architecture is divided into two parts, transmission circuit packs and controllers. The transmission circuit packs provide the SDH standard traffic to flow on the fiber and the controllers are designed to meet the OAM&P requirements. The flexible TeleCOMBUS-like bus architecture utilized in the ADM-150 allows a variety of El and E3 service mapping. The unidirectional path-switched ring (UPSR) configuration is also supported in this ADM-150 architecture