The HDMI Encoder/Decoder by IP is one set of HDMI signal extend device that follow the standard TCP/IP to transmit the HD signal by the LAN. The encoder and decoder can use together to do the complete transmission of stream media. It also the RS232 control signal can be transmitted to the decoder device to do distance control. By the LAN, it can let the HD signal to be transmitted to long distance and expand the AV use. Many set of encoder and decoder can integrate one multi-channel AV Matrix, TV Wall. It can do control by the client software.