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Pinko Pallino

5 Posts

284

May 9th, 2023 13:00

Precision 7560, USB speed and connectors issue

Hi, this is my first post.

On a Precision 7560 / Linux, the lsusb -t -v gives me the following output:

 

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 20000M/x2
    ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    |__ Port 3: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M
        ID 0bda:565c Realtek Semiconductor Corp. 
    |__ Port 3: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M
        ID 0bda:565c Realtek Semiconductor Corp. 
    |__ Port 13: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M
        ID 046d:c542 Logitech, Inc. 
    |__ Port 14: Dev 4, If 0, Class=Wireless, Driver=btusb, 12M
        ID 8087:0032 Intel Corp. AX210 Bluetooth
    |__ Port 14: Dev 4, If 1, Class=Wireless, Driver=btusb, 12M
        ID 8087:0032 Intel Corp. AX210 Bluetooth
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub

 

As you can see the PC has two high speed ports: 10000M (10Gbps) and 20000M/x2 (20Gpbs).

Now, I attach an external USB 3 (5Gbps) HDD to one of the Type-C port (on the left side) and I get (I show only the relevant part of the output):

 

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
    |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
        ID 1058:0820 Western Digital Technologies, Inc. My Passport Ultra

 

As you can see, it is attached to the 10Gbps bus, and not to the 20Gbps (as I would expect). 

Then, I move the USB HDD to the USB-A (on the right side) and I get (I show only the relevant part of the output):

 

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 20000M/x2
    ID 1d6b:0003 Linux Foundation 3.0 root hub
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
        ID 1058:0820 Western Digital Technologies, Inc. My Passport Ultra

 

As you can see, it is attached to the 20Gbps bus!

The questions are:

  1. Why the Type-C USB port is the 10Gbps and the USB-A is the 20Gbps?
  2. Can the USB-A provide 20Gbps throughput? 
  3. If the answer to question 2 is YES, what kind of cable should I use?

Thank you so much.

DELL-Cares

Moderator

 • 

27.6K Posts

May 10th, 2023 02:00

Thank you! We have received the required details. We will work towards a resolution. In the meantime, you may also receive assistance or suggestions from the community members.

DELL-Chris M

Community Manager

 • 

56.9K Posts

May 26th, 2023 03:00

Test the second left side TB4/USB-C port. Do you get the same results?

Anonymous

10 Elder

 • 

274.2K Posts

June 9th, 2023 02:00

The Type-C USB port typically supports a maximum data transfer rate of 10Gbps, while the USB-A port can provide a higher throughput of 20Gbps. However, it's important to note that the USB-A port's ability to achieve 20Gbps throughput depends on various factors, including the specific USB version and the cable used.

If you require 20Gbps throughput, you would need to use a USB-A cable that supports USB 3.2 Gen 2x2 or higher. These cables are designed to handle the increased data transfer speeds.

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