Configuring PoE

The following steps will help you optimize the Power over Ethernet (PoE) configuration for supporting wireless devices, such as access points (APs).
Your 200 Series switch supports the following standards:
  • Dot3af (low power) and legacy support
  • Dot3at (high power) applications
  • Flexible Power Management:
    • Power reservation
    • Power prioritization
    • Power limiting
Using your switch's PoE features, you can:
  • Provide power to requesting devices attached directly to the switch.
  • Disable some or all PoE ports from delivering power.
  • Manage the amount of power that can be delivered on a PoE port.
  • View the electrical measurements and power delivery status of the PoE ports.
  • Restore PoE ports to normal state when they are in a fault state.

To optimize the PoE configuration, follow these steps:

  1. To begin, find the switch's power budget.
    In the navigation menu, click System > PoE > Configuration.
    Click to expand in new window
    PoE Configuration Display

    In this example, the total power budget – marked by the arrow – is 185000 mw.



    You can view the same information in the command-line interface, using the show poe command. There, the output is displayed as follows:
    Total Power Available: WATTS I.E. 185 W
  2. When you know the power budget, determine the power requirements for the devices you want to add.
    For example:
    • AF Power = 12.95 W
    • AT Power = 25.5 W

    If the total wattage required exceeds what is available, some of the devices will require power from external sources – for example, from the RPS-500p Redundant Power Supply.

  3. Click the Port Configuration tab.
  4. Select only the ports connected to devices that will require PoE, as shown in this example.
    Click to expand in new window
    PoE Port Configuration Display
  5. Click Edit.
  6. In the Edit PoE Port Configuration window, set the priority to High for the wireless devices.
    Click to expand in new window
    Edit PoE Port Configuration Window
  7. Click Submit to save your configuration.
  8. To reboot a wireless device, disable PoE to the port. Wait about 10 seconds, then re-enable PoE.