SDH equipment can implement all kinds of function in the transmission network. According to the different function, the common SDH equipments include terminal multiplexer(TM), add-drop multiplexer (ADM), regenerator (REG), data cross connect (DXC).

• SDH设备用来完成传输网络的各种功能,根据完成的功能不同,常见的SDH设备可以分为四种,包括终端复用器TM,分插复用器ADM,再生中继器REG,数字交叉连接设备DXC。