USB Mania

allmankind

Active member
Well the people in charge of USB have scrambled the naming convention again, now making it even more difficult to know which version you are really getting. What a mess. Would it be so difficult to use sequential numbers (USB1, USB2, USB3 etc) instead of 3.1, 3.1 Gen 2, 3.1 Gen2x2 etc?

Anyway, what I am trying to find out is what are the actual specs on the U22-XJ and Max boxes for the USB-C port, as well as for the 3 USB-A ports.

Why is the USB-C port labeled as [Data Only]? What does that mean exactly?

What is the max data transfer rate on each of those USB ports?
What is the max data rate (of the video being played) that the box can handle?

Thank you in advance.
 
Well the people in charge of USB have scrambled the naming convention again, now making it even more difficult to know which version you are really getting. What a mess. Would it be so difficult to use sequential numbers (USB1, USB2, USB3 etc) instead of 3.1, 3.1 Gen 2, 3.1 Gen2x2 etc?

Anyway, what I am trying to find out is what are the actual specs on the U22-XJ and Max boxes for the USB-C port, as well as for the 3 USB-A ports.
1996: USB 1.0 is released, maximum transfer rate is 12Mbps.
1998: USB 1.0 is released, maximum transfer rate is 12Mbps.
2001: USB 2.0 is released, maximum transfer rate is 480Mbps. (480Mbps = 60MB/s)
2008: USB 3.0 is released, maximum transfer rate is 5Gbps. (5Gbps = 640MB/s)
2013: USB 3.1 is released, maximum transfer rate is 10Gbps. (10Gbps = 1.25GB/s)
USB 3.0 is renamed USB 3.1 Gen1, USB 3.1 is renamed USB 3.1 Gen2.
2017: USB 3.2 is released, maximum transfer rate is 20Gbps.
USB 3.0 is renamed USB 3.2 Gen1, USB 3.1 is renamed USB 3.2 Gen2, USB 3.2 is renamed USB 3.2 x 2.

These 2 links may answer your questions better.
https://en.wikipedia.org/wiki/USB
https://en.wikipedia.org/wiki/USB_3.0#3.1

Why is the USB-C port labeled as [Data Only]? What does that mean exactly?
Regarding USB-C port on U22-XJ:
A USB-C port is able to support these 5 kinds of signal: video, audio, charging, ethernet network, transferring data(attach a USB drive, flash the firmware).
However, most of the USB-C port will not support all these 5 kinds of signals.
USB-C port on U22-XJ is the same, it supports transferring data and charging on 5V, but charging is not an important one, so we told public that the USB-C port on this device is [Data Only].

What is the max data rate (of the video being played) that the box can handle?
It depends on which port you choose to use.
Usually a movie file's data rate should be below 50Mbps.
The maximum we tested is 400Mbps, works OK.
 
1996: USB 1.0 is released, maximum transfer rate is 12Mbps.
1998: USB 1.0 is released, maximum transfer rate is 12Mbps.
2001: USB 2.0 is released, maximum transfer rate is 480Mbps. (480Mbps = 60MB/s)
2008: USB 3.0 is released, maximum transfer rate is 5Gbps. (5Gbps = 640MB/s)
2013: USB 3.1 is released, maximum transfer rate is 10Gbps. (10Gbps = 1.25GB/s)
USB 3.0 is renamed USB 3.1 Gen1, USB 3.1 is renamed USB 3.1 Gen2.
2017: USB 3.2 is released, maximum transfer rate is 20Gbps.
USB 3.0 is renamed USB 3.2 Gen1, USB 3.1 is renamed USB 3.2 Gen2, USB 3.2 is renamed USB 3.2 x 2

These 2 links may answer your questions better.
https://en.wikipedia.org/wiki/USB
https://en.wikipedia.org/wiki/USB_3.0#3.1


Regarding USB-C port on U22-XJ:
A USB-C port is able to support these 5 kinds of signal: video, audio, charging, ethernet network, transferring data(attach a USB drive, flash the firmware).
However, most of the USB-C port will not support all these 5 kinds of signals.
USB-C port on U22-XJ is the same, it supports transferring data and charging on 5V, but charging is not an important one, so we told public that the USB-C port on this device is [Data Only].


It depends on which port you choose to use.
Usually a movie file's data rate should be below 50Mbps.
The maximum we tested is 400Mbps, works OK.

Is it possible to use the usb-c as second video output if you change the output in "kernel" settings ??
Or maybe it works with coreelec ??
 
It depends on which port you choose to use.
Usually a movie file's data rate should be below 50Mbps.
The maximum we tested is 400Mbps, works OK.

Thanks for the input. I was/am aware of the history and naming conventions of USB, I was just having a rant at the total inconsistancy of what the (so called) standards committee are doing.

My question was what is the specific designation of the USB-C port and it's max data rate, and as long as we are on the subject of data rates, what is the max data rate of the 3 USB-A ports?

This all came up when I added a USB-C 3.1 Gen 2 (10Gbps) drive array to my system, which is now attached to the U22-XJ Max via the USB-C port.

I would also like to add that the U22-XJ Max cannot play 10 bit 4.2.2 100Mbps GH5 camera original footage. This surprised me. Is there some setting on the U22 I need to activate/deactivate?

Oh, my U22 is running CoreElec, not android.
 
Last edited:
Back
Top