Budgeting PoE Power
The PoE switch component in the Avigilon ENVR2 Plus Appliance device can output a total of 125 W of power
to the connected devices. Each PoE port is capable of outputting 15.4 W to standard PoE devices, and 30 W
to PoE+ devices. This typically means that the device can support eight standard PoE devices or up to four
PoE+ devices.
Advanced users can manually adjust the PoE power budget for each port to consistently accommodate the
cameras needed.
If you choose to manually adjust the PoE budget at each port, be aware that you must also account for
potential power loss in the cable. Unless the amount of power loss in the cable is known, or you are using
cables much shorter than 100 m, use the following estimates:
l
If the device uses less than or equal to (<=) 15.4 W and the cable length is 100 m — expect up to 2.5 W
of power loss.
l
If the device uses more than (>) 15.4 W and the cable length is 100 m — expect up to 4.5 W of power
loss.
To calculate the recommended power budget for each port when using 100 m cables, use the following
equation:
Power budget =
<Camera power consumption>
+
<Expected cable power loss>
Example
: Connect the following 8 cameras to an 8-port device:
4 x HD dome cameras
(9 W + 2.5 W) x 4 = 46 W
2 x HD PTZ camera
(25.5 W + 4.5 W) x 2 = 60 W
2 x HD micro dome
(4 W + 2.5 W) x 2 = 14 W
Total
= 120 W
Note:
Shorter cables will have a lower expected power loss than the maximum power loss used in
this calculation. However, if you miscalculate the required power for a PoE port, the connected
cameras may be shut down if total power output exceeds 125 W.
Budgeting PoE Power
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