... .matrix switch 4*4 over UTP,any to any 2.HDMI V1.4a,HDCP v1.2, ... 3.super IR&RS232 HDMI Matrix OVER UTP 4*4 specification. Full matrix switch over UTP, Any to Any. 19 inch rack ... callback function is optional, an extra cost of IR sender, receiver, IR adapter is necessory if needed.our market: Japan:40 ... :35% American:15% others:15% 4*4 HDMI Matrix over UTP