Sunix DPKS04HP0 DevicePort dock mode ethernet enabled – 4x Powered serial/RS-232 over ethernet ( 2xRJ45 ) ( +5VDC power output via COM 9th pin , for serial devices to function without ac-adapter ) , upstream+downstream with daisy chain support upto 4x units / 12x serial ports , auto-detect and port-mapping , 115 Kbps , sunix DPL2000Q chipset , 190×119.6x27mm , 15KV ESD protection + 8KV IEC1000-4-2 Contact Discharge + 4KV line-to-line protection , powered by USB – to prevent on-line spy recording, DevicePort Dock Mode limits specific ethernet port connection to PC ( not directly on router or switch )