Adaptec USBXchange User Guide - Page 6

User's Guide: USBXchange • 6 Connecting to the USB Port 1 After connecting to your SCSI devices, if your computer is not powered up, then power it up now. Connect the USB connector into the USB port located on your computer. 2 Make sure the cable ends are firmly connected. Do not force your connections as this may damage your system or the USBXchange. Note: The USBXchange receives its +5V power from either the terminator power line of the attached SCSI device, or if no termination power is available, it switches automatically to receive the power from the USB bus. Attach the USB connector from the USBXchange to the USB port on your computer Connecting to an External USB Hub 1 Connect the external USB hub (purchased separately) to the USB port of your computer. Note: To ensure proper operation, Adaptec recommends using only self-powered hubs (only hubs that receive their power from an A/C connection). Otherwise, you will need to connect the USBXchange to an optional power supply. See USBXchange Power Supply on page 13 for more information.