IGW Power over Ethernet
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Objective
This document presents details on the Power over Ethernet support for the F5 Volterra Industrial Gateway (IGW) 5000 and 5500 series.
IGW 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) - IGW 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) - IGW hardware 25.5W max at Power Device (PD) - Customers’ poe device such as camera and sensors |
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 | All ports have equal priority with power allotment on a first come, first-served basis. |
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-served basis.
The following scenarios explain the power management operation:
-
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 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
-
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 is disconnected and replaced with another device that requires 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.
-
Following-on to scenario 3, if device on port 3 is replaced with a device that draws 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.