Each modem uses 2 ports in sendQuick box. Modem is connected to sendQuick via a Y cable as shown below. Bottom of Y cable goes to the modem, and the top 2 goes to 2 ports in sendQuick server. Each sendQuick box has 4 ports. This means that each sendQuick can support up to 2 modems. USB hub is needed when there are 2 or more modems being used. Our current USB hub has 7 ports. It is recommended to use an external power source for the USB hub. Drawing power from sendQuick may affect the life of the sendQuick box.