1. Why chat about Type-C

        Type-C Full name USB Type-C, is a type of USB interface. Common USB interface types are Type-A, Type-B, Micro-B, etc.

         Today we are talking about the interface type Type-C that has been widely adopted by the mobile phone industry, because it has the advantages of small size, positive and negative insertion, etc., through Type-C that meets certain standards. Data cable, in the future, we can connect notebooks to high-performance graphics cards, replace HDMI and VGA cable-connected displays with Type-C data lines, etc., and more and more people will see Type-C interfaces in electronic devices, so everyone in the future The most likely data line to purchase is the data line of the Type-C interface.

2, the two functions of the data line

         Data line two major functions: one is data transmission; the second is power transmission. The two major functions of the data line are just as good as the various types mentioned above.  

  Knowledge Point 1: The interface type does not determine the charging and data transfer capabilities.

        Data Transfer: USB is a bus architecture developed by Intel Corporation. Its standard has experienced USB1.0, USB1.1, USB2.0, USB3.0, USB3.1 and so on. Among them, USB2.0 supports a transmission rate of 480Mbps, USB3.0 supports a transmission rate of 5.0Gbps, and USB3.1 supports a transmission rate of 10.0Gbps. Note that Mbps is not equal to MB/S, and the relationship is 1 Mbps = 0.125 MB/S. That is to say, the transmission rate of USB2.0 can theoretically reach 60MB/S, and the transmission rate of USB3.1 can theoretically reach 1.25GB/S. It is also because USB3.1 has such an amazing transmission speed, because it is most likely or has gradually become the transmission standard of the future.

  Knowledge Point 2: Whether to support the transmission, mainly to see if it supports USB3.0 and above.

        Charging media: All major mobile phone manufacturers are now launching mobile phones with fast charging function. Whether the mobile phone can charge quickly depends on whether the charging head, data cable and mobile phone are all the same or Compatible fast charging standards, the three must work together, indispensable. Due to the different fast charging schemes, the US USB-IF  organization has introduced the USB PD protocol specification fast charging standard. The USB-PD 3.0 protocol already includes Qualcomm QC 3.0 and 4.0, Huawei's SCP and FCP, MTK. PE3.0 and PE2.0, as well as OPPO's VOOC (where the source is). It should be noted here that the USB PD protocol specifies that the interface type is Type-C. In other words, the charging line supporting the PD protocol must be Type-C, and the Type-C data line does not necessarily support PD fast charging. The charger supporting PD3.0 protocol has a maximum output power of up to 100W. The power can only be adjusted according to the device. For details, see Xiaomi 90W fast charging head. In addition, the charging cable supporting the PD3.0 protocol can support the transmission rate of USB 3.1, and can only support the transmission rate of USB2.0. This is why, at the beginning, the fast charge data line that comes with the Xiaomi notebook can only achieve an average transmission speed of 30MB/S.

 Knowledge Point 3: Type-C is only necessary to support PD.

3, talk about the price

         After talking for so long, I have to go back to the question of why a data line will cause my concern. Let's take a look at the promotional points and prices of each (C to C) data line:

        From the perspective of various publicity, the basic data line is actually supporting the data line of PD fast charge protocol and USB2.0 transmission standard (unadvertised and 480Mbps are USB2.0), the price At around 30 yuan (except for Apple), while supporting the data line of PD fast charge protocol and USB3.0 or higher transmission standard, the price will increase exponentially, so you need to actually purchase the data cable in the future. Demand purchase, not the more expensive the better.

  Knowledge point 4: The data line is not as expensive as possible, and it is most important to meet the demand.

4, the last supplement

       E-mark: All full-featured Type-C cables should be packaged, not fully functional. The chip can provide information such as power transmission capability and data transmission capability to the device.

       Thunder 3: Apple's interface transmission specification based on the USB Type-C interface type, compatible with Type-C interface devices, and the same as the full-featured Tpye-C interface, can be transferred through the device Or direct connection, support display output, external graphics card and other operations. Can be understood as Apple's own set of higher than (transmission rate and price 4 times more than  ) USB3.1.