USB 3.2 Specification Published and Announced

by Hilbert Hagedoorn on: 09/27/2017 07:11 PM | source: | 28 comment(s)

A while ago there was already word out on the street that the USB Focus group would be announcing a new draft for upcoming USB 3.2, that has now been finalized and published. To keep things really simple, we're doubling thing up once again.

Where USB 3.0 aka 3.1 Gen1 was capable of 5 Gbps connectivity, USB 3.1 Gen2 did 10 Gbps. USB 3.2 will double that up-towards 20 Gbps. Divide it by 8 bits and that would be 2500 MB/sec from which you need to deduct encoding and errors. There is a distinction though as it is based up-on two-lane operation as tweakers.net spotted today.

Key characteristics of the USB 3.2 solution include:

Two-lane operation using existing USB Type-C cables
Continued use of existing SuperSpeed USB physical layer data rates and encoding techniques
Minor update to hub specification to address increased performance and assure seamless transitions between single and two-lane operation

So basically using two 10 Gbit/s lanes you get towards a throughput of 20 Gbps. Obviously you will need a host and client connection that is compatible with the new standard. Current USB type C cabled would be compatible if they have been certified for 10 Gbps SuperSpeed USB. If you like to do some reading, there is a 548 page document available on the new 3.2 Spec, download here.


USB version	Speed	Encoding	Connectors
USB 2.0 (incl usb 1.0 and 1.1)	up to 480 Mbps	8 / 10bit	Type a, b (mini, micro), c
USB 3.1 Gen 1 (SuperSpeed Usb)	up to 5 Gbps	8 / 10bit	Type a, b (mini, micro), c
USB 3.1 Gen 2 (SuperSpeed usb Gbps)	up to 10 Gbps	128 / 130bit	Type a, b (micro), c
USB 3.2 (SuperSpeed usb 20 Gbps)	up to 2 lanes 5 Gbps up to 2 lanes 10 Gbps	128 / 130bit	Type a, b (micro), c

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bensmooth
Senior Member

Posts: 191
Joined: 2014-09-23

#5476376 Posted on: 09/27/2017 10:33 PM

Is thunderbolt still faster reason i ask is because theres been so many usb port updates over the past 2 years im trying to keep up myself lol

Ricepudding
Senior Member

Posts: 862
Joined: 2017-02-17

#5476400 Posted on: 09/28/2017 12:51 AM

Have we got to the stage now where we might as well use USB instead of Sata? XD

Why why why has Sata not been increased in so long >.> might as well use USB or thunderbolt for SSD's since Sata bottlenecks them.... 2500 MB/s comes close to m.2 slot speeds XD

Mufflore
Senior Member

Posts: 14071
Joined: 2010-05-22

#5476410 Posted on: 09/28/2017 01:51 AM

thatguy91
Senior Member

Posts: 6640
Joined: 2010-08-27

#5476423 Posted on: 09/28/2017 03:03 AM

The USB 3.1 generations and 3.2 should have been released at once. If they have further specs planned for the next say, year, they should wait and incorporate it together. I understand why there aren't 12 USB 3.1 gen 2 ports on the computer, there's simply not enough bandwidth to run them at full usage. Ideally there should be USB 3.0 ports (no USB 2.0), and a couple of USB 3.2 devices using a single port type for high bandwidth, high power devices (relative) like external drives or quick charging. USB 2.0 devices should be supported in a special USB 3.0 mode that maximises USB 2.0 performance, and doesn't limit USB 3.0 devices speed if on the same hub.

DLD
Senior Member

Posts: 887
Joined: 2002-09-14

#5476449 Posted on: 09/28/2017 06:42 AM

@thatguy91

Exactly, but, alas!, only from the logic's point of view. Which is not a point of the greedy bastards called companies - they profit more by cutting the bread into thinner slices, pouring milk into the smaller cups and selling "refreshed"/"refurbished" ideas and solutions every now and then...

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