USB Hub Devices

• Do not cascade hubs beyond four levels on either SPARC based systems or x86 based systems. On SPARC systems, the OpenBoot PROM cannot reliably probe beyond four levels of devices.

• Do not plug a bus-powered hub into another bus-powered hub in a cascading style. A bus-powered hub does not have its own power supply.

• Do not connect a device that requires a large amount of power to a bus-powered hub. These devices might be denied connection to bus-powered hubs or might drain the hub of power for other devices. An example of such a device is a USB diskette device.