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The Same Are All Copper Media. Why Is USB3 Faster Than 2?
Jul 03, 2018

Judging from current technological developments at the end of 2015, the transmission frequency limit of copper cables is about 20 to 30 GHz, the frequency of USB 2.0 signals on copper cables is 480 MHz, USB 3.0 is 5 GHz, and USB 3.1 At 10 GHz, they are all less than the limit frequency of the copper cable. Therefore, the limitation of the standards-compliant physical media (currently) will not affect USB transmission.Moreover, Ethernet can also use copper cables from 10M to 10G today. The speed increase of USB from 2.0 to 3.0 is mainly due to the performance of the controller: the frequency and the encoding and decoding capabilities of the controller, and the fact that the encoding mode has little to do with the media changes, but it is not the main reason. The controller is equivalent to the hardware CPU, and the controller has strong throughput, so the data transmission speed is fast. For example, the essential difference between SSD and U disk is on the controller. U disk controllers are generally 8-bit, and SSDs are 32-bit, with greater throughput and faster processing. Some people mentioned that the cable is different, and indeed it is, but the cable difference is only to provide shielding protection, because the high-frequency letter is more likely to be disturbed, the cable itself is a common copper cable (electrical performance needs to meet the requirements, such as impedance Wait).