Introduction to USB
Topology
USB Spec Provides for a Flexible Tiered Star Topology
•Single Host – The host controls communication with each device
•Up to 127 devices can be attached
•Devices are one of the following:
TM
–Hubs (provide additional attachment points)
–Functions (devices) which provide capabilities to the system (e.g., printer, thumb drive,
•Up to 7 tiers
–Can have up to 5 hubs deep with a max of 5 meters between each hub
