Volterra Hardware Power over Ethernet

Objective

This document presents details on the Power over Ethernet support for the Volterra hardware.

Volterra hardware supports both POE (802.3af) and POE+ (802.3at).

Type Details
POE Power Over Ethernet
802.3af
15.4W max at Power Sourcing Equipment (PSE) - Volterra hardware
12.95W max at Power Device (PD) - Customers’ poe device such as camera and sensors
POE+ Power Over Ethernet plus
802.3at
30W max at Power Sourcing Equipment (PSE) - Volterra hardware
25.5W max at Power Device (PD) - Customers’ poe device such as camera and sensors

Industrial Gateway (IGW) 5000 and 5500 Series POE

IGW 5000 and 5500 Series POE Power Budget

Property Details
Total power budget 64.8W
Guard band 3W
Available power 64.8-3=61.8W
Power management mode Dynamic (measured and calculated in real time)
Port priority Lower number ports have higher priority than higher number ports

Note: IGW requires an external POE PSU.

IGW 5000 and 5500 Series POE Power Management

The total power budget for POE on the IGW is 64.8W with a guard band of 3W. Power consumption for each port is measured and calculated dynamically in real-time. Each port receives power on a first come first serve basis, with lower numbered ports having higher priority than higher numbered ports.

The operation of a first come first serve basis can be explained using the following five scenarios:

  1. 4 POE devices connected to the POE ports on the IGW and they all draw 15Ws each.

    • Total calculated power draw = 15+15+15+15= 60W
    • Power Available = 61.8W
    • All four devices will be provided power as needed
  2. 2 POE+ devices connected to the POE ports on the IGW and they both draw 25Ws from the IGW. A third device is now connected drawing 15Ws.

    • Total calculated power draw after the third device is connected = 25+25+15=65W
    • Power Available = 61.8W
    • Third device will not be powered up.
    • First two devices continue to be provided power as needed
  3. 4 POE+ devices connected to the POE ports on the IGW and they all draw 15Ws in steady state from the IGW. Now device on port 3 requires more power and begins drawing 25W from the IGW

    • Total calculated power draw = 15+15+15+25=65W
    • Power Available = 61.8W
    • Device on port 3 will be powered down
    • Devices on port 0,1,2 will be provided power as required.
  4. 4 POE+ devices connected to the POE ports on the IGW and they all draw 15Ws in steady state from the IGW. However, device on port 0 requires more power and begins drawing 25W from the IGW

    • Total calculated power draw = 25+15+15+15=65W
    • Power Available = 61.8W
    • Device on port 3 will be powered down
    • Device on port 0 will be provided the increased power of 25W
    • Devices on port 1 and 2 will continue to be provided power as required.
  5. Following-on to scenario 4, once device on port 0 goes back to drawing only 15W, then the calculated power draw from the IGW will be 60Ws which is less than Power Available (61.8W) and therefore device on port 3 will be supplied power as required.

Industrial Server (ISV) 8000 Series POE

ISV 8000 Series POE Power Budget

Property Details
Total power budget 126.2W
Guard band 3W
Power Available 126.2-3=123.2W
Power management mode Dynamic (measured and calculated in real time)
Port priority Lower number ports have higher priority than higher number ports

ISV 8000 Series POE Power Management

The total power budget for POE on the IGW is 126.2W with a guard band of 3W. Power consumption of each port is measured and calculated dynamically in real-time. Each port receives power on a first come first serve basis, with lower numbered ports having higher priority than higher numbered ports.

The operation of a first come first serve basis can be explained using the following five scenarios:

  1. 8 POE devices connected to the POE ports on the ISV and they all draw 15Ws each.

    • Total calculated power draw = 8x15= 120W which is less than
    • Power Available = 123.2W
    • All eight devices will be provided power as needed
  2. 4 POE+ devices connected to the POE ports on the ISV and they draw 25Ws from the ISV. A fifth device is now connected drawing 25Ws.

    • Total calculated power draw after the fifth device is connected = 4x25+25=125W
    • Power Available = 123.2W
    • Fifth device will not be powered up.
    • First four devices continue to be provided power as needed
  3. 8 POE+ devices connected to the POE ports on the IGW and they all draw 15Ws in steady state from the ISV. Now device on port 7 requires more power and begins drawing 25W from the ISV

    • Total calculated power draw = 7x15+25=130W
    • Power Available = 123.2W
    • Device on port 7 will be powered down
    • Device on port 0 will be provided the increased power of 25W
    • Devices on port 1-6 will continue to be provided power as required.
  4. 8 POE+ devices connected to the POE ports on the IGW and they all draw 15Ws in steady state from the IGW. However, device on port 0 requires more power and begins drawing 25W from the IGW

    • Total calculated power draw = 7x15+25=130W
    • Power Available = 123.2W
    • Device on port 7 will be powered down
    • Devices on port 0-6 will continue to be provided power as required.
  5. Following-on to scenario 4, once device on port 0 goes back to drawing only 15W, then the calculated power draw from the IGW will be 120Ws which is less than Power Available (123.2W) and therefore device on port 7 will be supplied power as required.