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cascading two hubs usb

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nemuri

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hi,
i need to connect two hubs, so my configuration is
pc <-> hub <-> hub <-> low speed device.

i have a question : when a pc sends data to low device via a hub, it sends a PRE PID, to tell the hub that the data are low speed . then the hub sends the data at low speed. but when it comes to the second hub, it also need a pre pid sent at full speed to propagate the low speed data.

how does it work with two hubs ? does the pc sends 2 pre pid ?

thank you for your help
 

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