The AC Cannot Supply PoE for APs

<AC6605> display version                   //Display the AC version. 
<AC6605> display device                    //Display the type and status of components on the AC.       
<AC6605> display elabel                    //Display the electronic label of the AC.           
<AC6605> display poe device                //Display information about the PoE-capable AC.          
<AC6605> display poe information           //Display PoE running information on the AC.          
<AC6605> display poe power                 //Display information about the PoE power supply.             
<AC6605> display poe power-state           //Display the PoE power supply status of the AC.          
<AC6605> display poe power-state interface gigabitethernet 0/0/3           //Display the PoE power supply status of a specified interface.      
<AC6605> display logbuffer                 //Display information recorded in the log buffer.            
<AC6605> display trapbuffer                //Display information recorded in the trap buffer.   
<AC6605> display alarm history             //Display historical alarms on the AC. 
<AC6605> save logfile                      //Save logs in the log buffer to a log file and export the log file.

1. Check whether the power modules support PoE.
   • Observe appearances of power modules.

     The 150 W DC power module (02310JFD) and 150 W AC power module (02310JFA) of the AC6605 do not support PoE power supply.

     The 500 W AC power module (02130983) of the AC6605 supports PoE power supplyAppearance of a 500 W AC PoE power module.

   • Check the bar codes on power modules.

     If the bar code of a power module starts with 2102130983, the power module is a 500 W AC PoE power module of the AC.

   • Check the electronic labels of power modules.

     Log in to the AC and run the following command:

     <AC6605> display elabel

     The following command output is displayed:

     [Board Properties]
     BoardType=W2PSA0500
     BarCode=21021309838NCB000181
     Item=02130983
     Description=AC/DC power module--25degC-55degC-90V-264V-12V/10A,-53.5V/7.1A
     Manufactured=2012-11-25
     VendorName=Huawei
     IssueNumber=
     CLEICode=
     BOM=

     If the Itemfield is02130983, the power module is a PoE power module.

2. Check whether power modules are faulty.

   Check the status of indicators on a 500 W power module (02130983).

   Indicator	Status	Description
   INPUT	Steady green	The input power is within the normal range.
   	Steady red	The input power is out of range. For example, undervoltage or overvoltage occurs.
   	Off	The power cable is loose or no input AC power is provided.
   OUTPUT	Steady green	The AC output power is within the normal range.
   	Steady red	The output power is out of range, for example: Failure of fans in the power module Output overvoltage Output overcurrent Short circuit on the output line Overtemperature
   	Off	The power cable is loose or no input AC power is provided.

Technicalsupportpersonnel need to check for records of power module faults in the log file on the AC.

Run the following command in the system view (GE0/0/3 is used as an example):

<AC6605> display poe power-state interface gigabitethernet 0/0/3

If the Port power enabledfield isDisable in the command output, enable the PoE function in the interface view.

Check whether the fault is rectified.

• Perform a cross test to check whether network cables between the AP and AC are faulty.
• Check whether the network cables comply with PoE standards.

  A network cable testerormultimeter is used to check network cable quality.

The resistance of a network cable can be tested using the following methods:

• Method 1

  Use a network cable tester to test the resistance of a network cable.

• Method 2

  Connect test probes of a multimeter to the two ends of each network cable, and read the resistance value of the network cable on the multimeter. The cable resistance approximately equals the displayed value.

• Method 3

  Connect a network cable to an AP. Use a multimeter to test the resistance between pins 1 and 2 of the cable (or between pins 3 and 6, 4 and 5, or 7 and 8). The cable resistance approximately equals half of the displayed value.

  If the resistance of a network cable does not meet requirements of PoE standards, replace the network cable.

• The distribution frame is often used on the live network, and RJ45 connectors may be loosely inserted on the distribution frame. Perform a cross test to verify that cable connections on the distribution frame are normal.

The forcible power-on commands provide the following functions:

• Forcibly power on a PoE interface.

  <AC6605> system-view
  [AC6605] interface gigabitethernet 0/0/1
  [AC6605-Ethernet0/0/1] poe force-power
  Warning: Is there a valid PD connected to this interface? Yes or No?[Y/N]:y

• Configure the device to allow high inrush current during power-on.

  <AC6605> system-view
  [AC6605] poe high-inrush enable

• Enable an interface to check the compatibility of PDs.

  <AC6605> system-view
  [AC6605] interface gigabitethernet 0/0/1
  [AC6605-Ethernet0/0/1] poe legacy enable

Use a new AP or connect the network cable to a properly working AP. Check whether the AP can be powered on.

• If so, rectify the fault by referring to section "AP Startup Failures".
• If not, check the network cable again, or restart the AC if allowed and check whether the AC is properly grounded. Contact technical support engineers.