By PURPLELEC | 10 October 2023 | 0 Comments
The transmission protocol that determines the performance of the USB interface
The main thing that determines the performance of the USB interface is the transmission protocol. Currently, there are four types: USB standard protocol, Thunderbolt protocol, DP protocol, and PD protocol.
*USB standard protocol
It has the longest development time. At present, it is basically the USB3 series, USB3.0 (USB3.2 Gen1) < USB3.1 (USB3.2 Gen2) < USB3.2 (USB3.2 Gen2x2), and the theoretical peak rates are 500MB/S respectively. , 1 GB/s, 2 GB/s. Under normal use, USB3.0 is about 320MB/S, so the transmission rate of the same-shaped interface may be doubled.
The Thunderbolt protocol only uses Type-C, and it is not a public protocol like the USB standard protocol. As its name suggests, the transmission rate is faster. The latest Thunderbolt 4 has a rate about 8 times that of USB3.0. Of course, the price is not cheap. .
Common display communication protocols include DP1.2 (21.6 Gbps) and DP1.4 (32.4 Gbps). If connected directly without a docking station, DP1.2 is fully capable of supporting 2K144Hz display. Once it passes through the docking station, the bandwidth will be halved and can only support 2K60Hz. Therefore, if you want to achieve 2K144Hz through the docking station, you need the computer interface to support DP1.4 and purchase a docking station that supports DP1.4.
Standard fast charging protocol, the maximum power can theoretically reach 100W (20V/5A), while the Type-C interface of traditional notebooks is only 15W (5V/3A).
Therefore, our main idea when choosing an expansion dock is to choose a better and more comprehensive protocol.
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