The flatter, rectangular plug attaches to the USB port of your computer. The smaller plug that is more square in shape attaches to the back of the modem. Figure 1: As shown in Actiontec USB Call Waiting Modem diagram, there are jacks for connection to a phone and to a phone line. To help reduce Actiontec USB Call Waiting Modem load on your phone line, it is recommended that the modem be the only device connected. These are shown below:[…]