Gefen ex-tend-it 4x4 DVI Matrix - Manual (Page 6)

PANEL LAYOUT
3
Display 1 LED
Indicator
Front Panel
RS232 Controller Port
Display 2 LED
Indicator
Display 3 LED
Indicator
Display 4 LED
Indicator
IR Sensor
IR Extender Eye Port
Power Indicator
Back Panel
Connects to 5VDC
Power Supply
DVI Inputs
DVI Outputs