Dynabook Knowledge Base Article
Thunderbolt 3 Dock [PA5281E-*] - Compatibility and Configuration Guide


Compatiblity and configuration guide for the Toshiba Thunderbolt 3 Dock (PA5281E).



  Computer Requirements



  Using your dock for the first time


    1. Be sure to enable the "Internal Thunderbolt Controller" in the BIOS of your PC (BIOS Setting: Advanced - System Configuration - Internal Thunderbolt Controller - "Enabled").
    2. If you would like to use PXE boot function, please select "Thunderbolt Dock" in the LAN Boot Selection in the BIOS of your PC.


For additional Thunderbolt BIOS Configuration, please check BIOS menu section "Advanced" and scroll down to "Thunderbolt Configuration". In this section you will find the "Devices under Thunderbolt" configuration as well as "Security Level" selection.

Connecting the AC adaptor

        1. Connect the power cord to the AC adaptor.
        2. Connect the DC output plug of the AC adaptor to the DC IN 20V jack on the dock. -
        3. Plug the power cord into a live wall outlet. The power indicator on the front panel glows white.

Connecting to your computer

Plug one end of the Thunderbolt 3 USB Type-C cable into the Thunderbolt 3/USB Type-C port on the back of the dock and plug the other end into your computer which is powered on.



Thunderbolt vs. USB Type-C comparison:


The power delivery indicator on the front panel glows white when the computer is being supplied power from the dock.



Disconnecting/Undocking your computer

There are several ways to disconnect/undock your computer:

          If a USB storage device is connected to the dock, make sure that you save the data located on the USB device, and then remove the USB device first before disconnecting/undocking.


Thunderbolt Software

The Thunderbolt Software enables you to manage the dock. If not pre-installed, please obtain the Thunderbolt Control Center app via the Microsoft Store.

  1. After successfully connecting the dock to your computer, you will be prompted that "New Thunderbolt devices have been attached". Follow the on-screen instructions to enable Thunderbolt Software.
  2. Launch the Thunderbolt Software by right-clicking the icon in the system tray to configure the settings as desired.


View Attached Devices
It allows you to view all Thunderbolt devices attached to the computer. Users can check the device information, connection status and power mode here. You can also open Approve Thunderbolt Devices by clicking the Connected or Not connected button.


Approve Attached Devices
It allows you to select the device approve status. This item also pops up when new devices are plugged in.


Thunderbolt Networking

It allows you to select the device approve status (actions the same as Approve Attached Devices).

        Thunderbolt Networking is only available while there is a peer-to-peer connection between the computers.


Manage Approved Devices
It shows the status/information of the approved devices. You can choose to remove the selected devices or all.


It allows you to configure the settings of this software.


You will exit the software by clicking this button


Configuring Audio Ports

You can play back or record audio either through the audio port of the dock or the docked computer. However, you cannot use the audio ports on the docked computer and on the dock at the same time. Upon connection, the audio port on the dock might become enabled and the audio ports on the computer disabled. When you undock the computer, the audio ports on the computer are re-enabled automatically. To change the default settings, you might need to adjust the audio settings in Windows manually, as described in this section.


Configuring Video Ports


The dock provides the following video ports:

           Upon connection, the video output ports on the dock become enabled and the video output ports on the computer become disabled. When you disconnect the dock from the computer, the video output ports on the computer are re-enabled automatically.

Connect the monitor cable (not provided) to the video output port on the dock and the external monitor. This cable can be connected and disconnected any time without disconnecting the dock from your computer. You can customize the video settings of the dock. See Adjusting Video Settings section for more information (contained in user's manual).



How Standby/Sleep/Hibernation Mode Affects Devices Attached to the dock


 Problem    Troubleshooting Procedure

 AC adaptor does not power the dock.

  • Check the connections to make sure that the power cord/adaptor is firmly connected to the dock and a working power outlet.
  • Check the condition of the cord and terminals. If the cord is frayed or damaged, it should be replaced, while if the terminals are soiled, they should be cleaned with a clean cotton cloth.
  • If the AC adaptor still does not power the dock, you should contact dynabook Support.

 No video on the monitors attached
the video output ports on
 the dock.


  • Make sure the computer is connected with the dock. Check the Using your dock for the first time section in the user's manual to re-connect the dock to the computer.
  • Make sure that the video cable is tightly secured to the video port in the dock and that the display output setting of the monitor is set to the correct mode.
    This might be due to that the monitor(s) support higher resolutions than what the dock is able to support. Check the Configuring Video Ports section in the user's manual for details.
  • If only one monitor is shown, while the other is not, go to the Intel Graphics Control Panel to select the output for the second monitor. Only a maximum of three external monitors are supported.

The USB ports are not
 functioning on the dock.

  • Check the Using your dock for the first time section in this manual to re-connect the dock to the computer.
  • Remove the USB device from the dock and then reconnect it to a free port in order to ensure that it is firmly attached.
  • Ensure that any required USB device drivers are properly installed. To achieve this, refer to both the device documentation and the operating system documentation.

The LAN port is not functioning.

  • Check the Using your dock for the first time section in the user's manual to re-connect the dock to the computer.
  • Check for a firm cable connection between the LAN jack and the LAN hub.



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