SGI Silicon Graphics also labeled Artecon Product Line LS. Comes with main unit that lights green when plugged in, TWO Silicon Graphics Control Port Boxes, TWO cables labeled “Power Control” 35-89002801 (white about 6ft in length, with 4 gold pin RJ11 connectors that fit as should in Ports. Back of main box shows 4 Power Control Ports and 2,3,4 are plugged. Comes with a Power Adapter that fits the unit (12VDC @ 500mA). RJ45 ports labeled "A" and "B" for serial communication. Converts serial signals (like RS232C, RS422, or RS485) into Ethernet frames for network transmission. Honestly, I have looked myself, and had several very tech savvy friends try to track down exactly what it goes to and haven’t had any luck. Must be extremely rare!… also including a RJ45 cable (gray - 4ft) and can thrown in other cables if you let me know what you need. Since I cannot test it (other than to see the green light illuminate, I am selling as is, no warranty and no refund please. Last photo of all RJ11’s to Magnecraft.