Compound Device Connection; Host With Internal Non-Root Hub And Compound Device Connection - Smart Technologies SMART Board 800 Series User Manual

A P P E N D I X A
USB 2.0 specification primer

Compound device connection

In this diagram, you can see that connecting a compound device limits the maximum distance to
5 × 16' (5 m) = 80' (25 m).
Host (Tier 1) Tier 2
Host
Root Hub
Hub 1
16 ' (5 m ) + 16 ' (5 m )
N O T E
SMART Board 800 series interactive whiteboard systems are compound devices.

Host with internal non-root hub and compound device connection

In this diagram, you can see that connecting a compound device and a host with an internal non-root
hub further limits the maximum distance to 4 × 16' (5 m) = 64' (20 m).
Host with non -root hub
Host (Tier 1) Tier 2
Host
Root Hub
Hub 1
22
Tier 3 Tier 4
Hub Hub
2
+ 16 ' (5 m )
Tier 3 Tier 4
Hub
2
16 ' (5 m ) + 16 ' (5 m )
Tier 5
Hub
3 4
+ 16 ' (5 m ) + 16 ' (5 m ) = 80 ' (25 m )
Tier 5
Hub Hub
3 4
+ 16 ' (5 m ) + 16 ' (5 m ) = 64 ' (20 m )
Compound device
Tier 6 Tier 7
Hub
Function
5
Compound device
Tier 6 Tier 7
Hub
Function
5