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Message: <blockquote data-quote="ibnanv" data-source="post: 22091340" data-attributes="member: 218596">The USB 3.0 Promoters Group announced an update to the existing USB  3.1 standard in order to double the maximum possible bandwidth from 10  Gbps to 20 Gbps. This USB 3.2 specification is currently in the final  draft review phase. USB 3.2 will remain backward compatible with  existing USB devices.  The new specifications will retain the USB 3.1 physical layer data  rates and encoding techniques. The doubling of bandwidth is achieved by  going in for a two-channel operation (current USB 3.1 Gen 1/2 devices  use only one 'super-speed' channel).The use of two channels is possible  only if a certified USB 3.1 Type-C cable is used to connect the host and  the device.  To understand this further, it is helpful to take a look at the layout of the pins in a Type-C connector.  <a href="http://images.anandtech.com/doci/11667/usbtypec-pins.png" target="_blank"><img src="http://images.anandtech.com/doci/11667/usbtypec-pins_575px.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>  In addition to USB transfers, the Type-C connector also supports  'alternate modes'. In these modes, the cable can carry Display Port,  Thunderbolt, MHL, or HDMI signals. There are two high-speed channels in  the Type-C specifications, (TX1+/TX1-, RX1+/RX1) and (TX2+/TX2-,  RX2+/RX2-). USB 3.1 uses only one of these channels to achieve the  required bandwidth, with the other channel (four pins) dedicated to the  alternate mode signals. In some cases, if all high-speed channels are  used for the alternate mode, USB transfers are restricted to using the  legacy pins for USB 2.0 speeds. USB 3.2 will allow both channels (eight  pins) to become available for USB transfers. Obviously, both host and  client devices need to be updated to use both channels. Note that the  usage of any alternate mode automatically negates the availability of  the second channel between the host and the device for USB transfers.  Finally, a certified USB 3.1 Type-C cable is necessary between the  USB 3.2 host and device in order to get the full performance benefits  with dual lane operation. For passive cables, the USB 3.1 Gen 2 (10  Gbps) speeds are supported only if the length is 1m or shorter. The  Type-C cable market is a mess, with many products in the market not  carrying the proper certification, and the requisite logo (which is  supposed to be in place only after the <a href="http://www.usb.org/developers/compliance/cable/" target="_blank">USB-IF testing process</a>)  not being prominent enough even in certified products. To make matters  worse, most of the Type-C cables supplied with smartphones are limited  to supporting USB 2.0 speeds only. So, consumers are advised to do  proper research before purchasing Type-C cables for use with current USB  3.1 Gen 2 and future USB 3.2 systems.  The USB 3.2 update is consumer-friendly, since backwards  compatibility is retained and there is no need for any new cables.  Thunderbolt 3 also uses Type-C, and can go up to 40 Gbps. Its  specifications are being opened up, and that makes future developments  in the USB Type-C space worth keeping an eye on</blockquote>

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