Frequently Asked Questions

  • Disable LLDP Snooping
  • Ensure the port is set to deliver 30W or higher


No special configuration is required for Phihong, Microsemi and Blackbox POE switches.


  • Thinlabs PoE Computers can be powered by a POE 802.3at+ switch or midspan power injector.
  • A POE 802.3AT+ switch / injector can supply 30W or higher power per port.  
  • The device can be powered up to 100 meters (330 feet) using a CAT5e / CAT6 Ethernet cable.
  • Switches must be properly configured to provide the necessary power to a port. 
  • Check the peak capacity for an entire switch, which may be less than if all channels are plugged in.  



  1. enable
  2. configure terminal
  3. interface interface-id
  4. power inline {auto [max max-wattage] | never | static [max max-wattage]}
  5. end
  6. show power inline [interface-id | module switch-number]
  7. copy running-config startup-config

Detailed Instructions

      Command or Action Purpose
    1 enable 

    Switch> enable

    Enables privileged EXEC mode - enter your password if prompted.


    2 configure terminal 

    Switch# configure terminal 

    Enters global configuration mode.

    3 interface interface-id 

    Switch(config)# interface gigabitethernet2/0/1 

    Specifies the physical port to be configured, and enters interface configuration mode.

    4 power inline {auto [max max-wattage] | never |static [max max-wattage]} 

    Switch(config-if)# power inline auto 

    Configures the PoE mode on the port.  Keywords and meanings:


      auto - Enables powered-device detection; if enough power is available, automatically allocates power to the PoE port after device detection (default setting).


      max max-wattage - limits the power allowed on the port; if no value is specified, the maximum is allowed.


      max max-wattage - limits the power allowed on the port; range is 4000 to 30000 mW; if no value is specified, the maximum is allowed.


      never - disables device detection, and disable power to the port.


    If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port. A false link-up can occur, placing the port into the error-disabled state.


      static - Enables powered-device detection; pre-allocate (reserve) power for a port before the switch discovers the powered device; the switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection.

    The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode.

    5 end 

    Switch(config-if)# end

    Returns to privileged EXEC mode.

    6 show power inline [interface-id | module switch-number] 

    Switch# show power inline 

    Displays PoE status for a switch or a switch stack, for the specified interface, or for a specified stack member.

    The module switch-number keywords are supported only on stacking-capable switches.

    7 copy running-config startup-config 

    Switch# copy running-config startup-config

    (Optional) saves your entries in the configuration file.

    Click here for more detailed information on configuration of Cisco Catalyst IOS switches.



    • Check the internet connection to ensure it it functioning.
    • If attempting to access a specific website via the Internet, check to see if another website can be accessed through the internet browser.
    • If attempting to PING another IP address on the network, check to see whether that IP address can be accessed from another client.
    • Check the switch or router to ensure it is working - check the network ports to ensure they are working.
    • If network access is controlled by a central MAC address database, ensure that the correct MAC address of the device in question is included in the database.
    • If there has been a recent power outage, check whether devices (servers, switches, routers etc) have been probably reset or turned on.

    Hard wired Ethernet connections:

    • If using Static IP:  ensure that there are no duplicate IPs on the network.
    • If using DHCP:  check the network port by connecting a portable notebook computer at the same network jack, or;
    • Check the system at another station to ensure it is not a network port problem.
    • Check the CAT5e / CAT6 network cable.
    • If using PoE:
      • Make sure the network cables are firmly connected from the PoE switch to the internal PoE splitter and/or PoE injector.
      • Make sure the network patch cable is firmly connected on the computer from the POE Out port of the internal PoE splitter to the LAN port of the motherboard.
      • Check that overall power capacity of the PoE switch has not been met.

    Wireless connections:

    • Check to see if external wireless antenna is connected and threaded properly into the connector.
    • Try swapping an antenna from a working device.
    • Check that the wireless access point is online and accessible through other wireless clients.
    • Ensure that the correct SSID / Passphrase is entered in the wireless settings on the thin client.
    • If using a Windows XP Embedded device:
      • Verify or update wireless configuration on the client
      • Commit changes to the system using XPe's Enhanced Write Filter Manager (EWF) and reboot the system.


    If your system will not start, check the following:


    • If the power button is pressed, does the system turn on?

    Power Supply:

    • Does the power supply light come on?
    • Is there a loud hissing sound coming from the power supply?
      if Yes, the power supply may need to be replaced.
    • Check power cable connection to the AC adapter
    • Check DC connection to the thin client
    • Does the power supply work with another Thinlabs system?
    • Does the power supply work on another electrical outlet?
    • Does the system work with a different Thinlabs-approved power supply?
      [NOTE: Using non Thinlabs-approved power supplies with Thinlabs system voids all warranties].
    • Does the power supply connector fit snugly into the DC-In Port of the motherboard?


    • Is a Thinlabs-approved PoE switch being used?
    • Is the PoE switch powered on and configured correctly?
    • Is the port on the PoE switch to which the system is connected working?
    • Is the CAT5e/CAT6 network cable from the PoE switch to the PoE-In port working?
    • Has sufficient time been given for the system to boot (systems with PoE BIOS may take up to 30 seconds to display a welcome screen as there is low-level negotiation between the PoE switch and system)?

    PoE Injector:

    • Is the power cord properly connected to the Injector, and the power light from the injector on?
    • Is there a network cable connected from the "OUT" port of the injector to the "IN" port of the system's PoE splitter?
    • Is a network cable connected to the "IN" port of the injector?

    External PoE Splitter:

    • Is there power from the PoE splitter to the motherboard power port?
    • Is the PoE working on another system?


    • Is the battery charged?
    • Is the proper charger being used to charge the battery?
    • ONLY connect the charger to the battery - DO NOT directly connect the battery charger to the system as the motherboard will be overloaded and short out, voiding the warranty.
    • Is the battery properly connected to the system?  
      See the FAQ on Battery support for more information.
    • Is the battery cable in good condition?


    Connect the power cord to the POE Injector.

    Connect a CAT5e / CAT6 LAN cable from a working wall network jack to the In port of the injector.

    Connect another CAT5e / CAT6 LAN cable from the Out port of the POE injector to the POE In port of the computer.  The computer should automatically start.