Compounddevice connection

In this diagram,you can see that connecting a compounddevice limits the maximum distance to

5× 16' (5 m) = 80' (25m).

NO T E

SMART Board800 series interactive whiteboardsys tems arec ompounddevices.

Hostwith internal non-roothub and compounddevice connection

In this diagram,you can see that connecting a compounddevice and a host with an internal non-root

hubfurther 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
5Function
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 )

AP P E N DI X A

USB2.0 specification primer

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