ICR-4461
The following table summarizes the PoE parameters.
PoE PSE parameters
Required power supply parameters
48 V / up to 135 W
Power available to a PoE device
12.95 W / per port
Required power supply wattage
for a PoE device
15.40 W / per port
Power available to a PoE(+) device
25.50 W / per port
Required power supply wattage
for a PoE(+) device
30.0 W / per port
Table 5: PoE PSE Parameters
PoE Power Budget Examples
Example #1
This example is for the Advantech
power supply, which can supply
a power of
65 W
. We will use 15 W as the maximum router power consumption; see Chap-
ter
. You can use this power supply to power:
• up to
three PoE devices
(3
×
15.4 W + 15 W = 61.2 W < 65 W),
• just
one PoE+ device
(1
×
30 W + 15 W = 45 W < 65 W).
Example #2
To power four PoE+ devices, you should power the router with a minimum power supply of
135 W; see the following calculation:
• required power supply wattage = 4
×
30 W + 15 W = 135 W.
Use a power supply with enough power to cover the required power consumption of all
connected PoE devices, including the router itself. We recommend using a power supply
with some power reserve.
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