MP-104R Modulator: Quad-channel H.264 IP streams from LAN/WAN to multiplexed ATSC/QAM J.83B output. Input: 2x HDMI 1080 50/60; Output: 2x SPTS or 1x MPTS H.264 IP streams. Input: 4x SPTS or 1x MPTS H.264 IP streams; Output: 4x ATSC/QAM J.83B subchannels.