At first glance, two USB-C cables may seem interchangeable: they have the same oval connector and often have no legible markings. What types of USB-C cables exist: various functionsThe most useful classification is based on claimed performance, not just the name of the standard. 5 or 10 Gbit/s USB cables. 20 Gbit/s USB cables. USB-C charging: what Power Delivery and e-markers changeThe presence of two USB-C connectors does not automatically indicate available power.