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TUSB8041: TUSB8041 USB-HUB Layout files

Part Number: TUSB8041

we Design a card with TUSB8041 and it works OK

it  communicat to HOST via  USB 3 transfer  large data transferusing a 1 meter cable
  but With a 5 meter cable, data transmission is sometimes interrupted and required for RESET

Before mass production 'ק  want to improve the LAYOUT

Our assessment is that it needs to improve LAYOUT  in terms of GND shielding and transmission lines etc 

Can you advise me on how to improve LAYOUT?

Best regards

haim