USB 2.0 standard uses bi-directional communication over tightly controlled differential transmission line. The signals are originated from a 90-Ohms controlled driver, and are received with 90-Ohm impedance-controlled receiver. The direction is determined by half-duplex protocol, so there is no collision possible. Signal re-drivers/conditioners are not included into USB 2.0 Specification.
To get the signal conditioned, Texas Instruments offers a new class of devices, USB 2.0 re-driver, TUSB211/214 family. In application diagram, the device sits simply on the top on uninterruped differential transmission line, which apparently shorts both in-out ports of the IC, unless they use the miniscule inductance along the 2-mm long trace. The application diagram (and PCB layout) shows this:
Could someone explain how do they do this?