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TUSB2046B: USB HUB Configuration question

Part Number: TUSB2046B

Hello,

In the '2046-PlainSelfPower' reference design, DM and DP signals have 15 kOHM pull-down resistors.  Can you please let me know the purpose of these?  The 15 kOHM pull-down resistors are not mentioned in the datasheet.  I also need to find out if I can omit them if the signals are connected to an onboard USB device.