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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).
Compound device
Root
Hub
Hub
1
Hub
2
Hub
3
Hub
4
Hub
5
Function
Host
Host (Tier 1) Tier 2 Tier 3 Tier 4 Tier 5 Tier 6 Tier 7
16 ' (5 m) + 16 ' (5 m ) + 16 ' (5 m) + 16 ' (5 m) + 16 ' (5 m) = 80 ' (25 m)
N O TE
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
Compound device
Root
Hub
Hub
1
Hub
2
Hub
3
Hub
4
Hub
5
Function
Host
Host (Tier 1) Tier 2 Tier 3 Tier 4 Tier 5 Tier 6 Tier 7
16 ' (5 m) + 16 ' (5 m) + 16 ' (5 m ) + 16' (5 m) = 64' (20 m)
A P PE N D I X A
USB 2.0 specification primer
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