Quantum DAT 160 User Guide

Appendix C  USB Configuration Guide

Setting Up a USB Network

Quantum DAT 160 User’s Guide

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implemented the USB interface, as defined by the USB specification. 

There are many types of USB logos depending on which features of the 

USB specification a device supports. A USB 2.0 logo-ed device correctly 

supports high, full, and low speed data transfer.

Setting Up a USB Network 

3

USB is very user friendly. The interface automatically assigns addresses 

to devices; you simply need to connect a USB device to a USB port on a 

system using a USB cable. If you have many USB devices or need to place 

a device away from your system, you may place up to a maximum of five 

USB hubs between the device and host system and connect them with 

additional cables. 
If you are using a high-speed (USB 2.0) device, make sure that the USB 

host at the system and all the hubs between the device and host support 

high-speed (USB 2.0) transfer.
When using a bulk transfer device, such as a tape drive, do not use other 

USB devices that will place restrictions on the USB bandwidth available 

to the bulk transfer device.
If several USB device requiring large amounts of the USB network 

bandwidth are to operate simultaneously, an additional host must be 

added to the system. Each device must then be placed into the separate 

networks starting at the different hosts. An additional host is typically a 
new USB HBA, which plugs into the host system’s PCI slot, creating a 

new USB host that resides on the network. 

Always use USB logo-ed components in your USB network. This is the 

best and easiest method to ensure reliable operation.

If several USB adapters are placed into a system, demands on 

the bandwidth of the system bus will constrain the USB 

devices’ performance.