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USB 3.1 Gen 2 and USB 3.2 confusion regarding Type C ports
  • Industry is so eager to push new things that lot of articles and claims are just lies


    Real authors of USB-C is the smartphone manufacturers, who wanted reversible port like Apple have and also wanted USB 3.0 speeds without bulky long and prone to breakup USB 3.0 micro port (it is really awful).

    Yet, USB-C port is expensive and fragile for industry outside small gadgets. Yet media, especially ASMedia :-), want you to believe that you really need USB-C for fast 10Gbit transfers, it is not so.


    In reality in each orientation only two pairs are used (one RX and one TX).


    As we can see at USB 3.0 Type A connector pinout - it also has same lines for USB signals (hence Gen 2 motherboards and adapter using them).


    Now to USB 3.2 20Gb mode (aka 2×2)

    USB 3.2 takes advantage of the four differential SuperSpeed/SuperSpeedPlus pairs present in the USB Type-C connector, unlike USB 3.1 and USB 3.0, which used one or the other TX/RX lane pair, depending on Type-C connector orientation.

    This will require to have USB-C port.

    A USB 3.2 implementation achieves a 20Gbps raw data rate by lane striping and lane bonding (e.g., splitting and combining data) with two USB 3.1 (10G) lanes. USB 3.2 also supports 10Gbps by striping and bonding two USB 3.0 (5G) lanes. USB 3.2 supports USB Type-C features like Alternate Modes, Power Delivery, and Digital Audio.


    The USB-IF is emphasizing the transition to Type-C by moving the USB cable and connector chapter to a separate document and renaming the standard-A, standard-B, and mini/micro connectors as legacy USB connectors.

    All passive USB Type-C cables can be used for USB 3.2 GenXx2 connections since four SuperSpeed/SuperSpeedPlus differential pairs are mandatory per the USB Type-C specification. A passive cable designed for Gen2 (10G) is limited to approx. 1m length and can support the new 20G connection speed. Two- to three-meter passive cables designed for Gen1 (5G) can support the new 10G connection speed.

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