serial to usb adapter with westell 6100 modem?

I've been told by Verizon that I can connect a Westell 6100 modem to a computer via a USB port. I've got an older system that only has a serial port. I can use a serial to USB adapter, but would like to know if this would degrade the DSL speed or cause problems with the connection.

Currently an old courier dial-up modem is on the serial port and works with no problems.

Thanks for any help.

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