Hi Pedro,
Don’t have much idea 
But hope following link will give you some point.
[url]https://forum.sierrawireless.com/t/q2686-as-an-usb-sniffer/4108/1]
Also for USB interface specifications you can refer to the PTS of Q2687.
http://source.sierrawireless.com/resources/airprime/hardware_specs_user_guides/airprime_q2687_product_technical_specification_and_customer_design_guidelines/
Regards,
Alex