2-13The features and functions of the E&M board are as follows.y Transformer and impedance matching circuits are built in.y It encodes the entered analog signal into the digital signal of the PCM method where the digitalsignal is decoded into the analog signal on the system through the PCM method.y There is separate logic to the control port of the board.y It has an outgoing signal control logic and incoming signal Detection logic.Front Panel and Structure of BoardE&M Board with 8 ports
