Features1 x plug-in terminal block, 6-pin, 1 x RJ11 socket V.24 interface V.24 interface, 1 x USB to connect the auto configuration adapter ACA21-USB USB interface12/24/48 VDC and 24 VAC operating voltage, 563 mA current consumption at 24 VDC, 282 mA current consumption at 48 VDC, 46.1 Btu (IT)/h power output0 to 100 m twisted-pair cable24-ports fast-ethernet-switch, managed, software layer 2 enhanced, for DIN rail store-and-forward-switching