Comment by lxgr

Sure, but I'm trying to do 10 Gbit/s on a <1m cable. That's definitely possible passively.

The USB specs say that C-to-C cables need an e-marker for that, and A-to-B or other non-C-to-C cables need nothing at all (apart from one or two resistors in case of an A-to-C or C-to-micro-B adapter).