Centralization of PDH, perfect unity of Optical Transceiver, Ethernet fiber Converter and PCM
Transmission side not only can use E1, but also PDH optical interface
Compared with conventional PCM, main control board can integrates 2 PDH optical interfaces, which can connect remote PDH, integrate highly and save slots, maximum 6 optical direction to connect, optical port supports the single fiber and saves the transmission line for the user