The RS-123 is a 19" 1RU rack mount chassis that can house two modules and are inter-connected which provides a different functionality compared to the RS-122. The RS-123 offers two set of configurations: The first configuration is transmitter (ARD-1006-A07-TX) + computer (MicroBox-1100A-E01). With the HDBaseT 2.0 transmitter and computer installed in RS-123, the computer display can be extended up to 330 feet away. The AV over IP transmitter (ARD-1006-A31-TX) and computer (MicroBox-1100A-E01) can be used to switch the computer display to different LCD monitors. If further than 330 feet distance is required, the ARD-1006-B31-TX with fiber interface is an option. The second configuration is receiver (ARD-1006-A07-RX) + splitter (AMP-1006-S04). With the HDBaseT 2.0 receiver and splitter installed in the RS-123, it gives you the ability to display remote video signal to multiple LCD monitors. And with the AV over IP receiver (ARD-1006-A31-RX) and splitter (AMP-1006-S04) installed, it gives the ability to display selected video source from multiple video sources to multiple LCD monitors. If further than 330 feet distance is required, ARD-1006-B31-RX with fiber interface can be used.