PoE maximum output

[Shams Rishad]

What's the maximum power (Watt) that can be drawn from a single PoE port and a PoE+ port?

From my studies what I understand is around 15W for PoE (usable 12W) and 30W for PoE+ (usable 25.5W).

And for devices with power rating greater than this, PoE injectors are required.

Please share your knowledge.

TIA

Rishad

[Leo Laohoo · Accepted solution]

What's the maximum power (Watt) that can be drawn from a single PoE port

15.4w for PoE, 30.0w for PoE+ and 60.0w uPoE.

[Shams Rishad]

Thanks a lot. I didn't know about uPoE. Just found out that this is Cisco proprietary and can deliver upto 60W through a port. Also discovered that my Cisco Unmanaged 110  Series switch doesn't support uPoE. My understanding is only 3 series support it.

Thanks. I've learnt a lot.

[Mark Malone · Accepted solution]

Hi

so poe capabilities depend on the hardware in place , it can vary switch to switch and diff types of blades etc but usually the max is around 30 wqtt per port , but as below if your using 30w then you may only have a certain allowed amount per switch as there is a total poe watt count you cant go over , if you have devices that say only use 7 watt you can also set it to use less power per port

if you want to know what your device is capable of you would check the public data sheets , as an example here is one for te 2960x models

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-x-series-switches/data_sheet_c78-728232.html

Most pf them are close enough

Table 8.       2960-X PoE and PoE+ Power Capacity

Switch Model	Maximum Number of PoE+ (IEEE 802.3at) Ports*	Maximum Number of PoE (IEEE 802.3af) Ports*	Available PoE Power (Single PS Source)
Cisco Catalyst 2960X-48FPD-L	24 ports up to 30W	48 ports up to 15.4W	740W
Cisco Catalyst 2960X-48LPD-L	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960X-24PD-L	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960X-48FPS-L	24 ports up to 30W	48 ports up to 15.4W	740W
Cisco Catalyst 2960X-48LPS-L	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960X-24PS-L	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960X-24PSQ-L	3 ports up to 30W	7 ports up to 15.4W	110W
Cisco Catalyst 2960XR-48FPD-I	24 ports up to 30W	48 ports up to 15.4W	740W
Cisco Catalyst 2960XR-48LPD-I	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960XR-24PD-I	12 ports up to 30W	24 ports up to 15.4W	370W
Cisco Catalyst 2960XR-48FPS-I	24 ports up to 30W	48 ports up to 15.4W	740W

[Mery]

THat is a very helpful post. What about the WS-C2960X-48TS-L does that support power over ethernet?

I am not sure if  supports it or not , cause there is no command power inline auto under interface command

(config)#interface gi1/0/45
(config-if)#power inline auto
                                    ^
% Invalid input detected at '^' marker.

But still there are phones connected to it and I assume they getting power from the switch.

I have some phone issues like going offline and need to be sure if that is a power issue or not

Thank you,

Mery

[Leo Laohoo]

Thank you very much for taking the time to rate our posts.  :)

[EdmundChee]

Now, according to the latest syllabus of CompTIA A+ 220-1101 (year 2022), the information below are word-for-word:

Power over Ethernet (PoE) 802.3af allows powered devices to draw up to about 13W supplied as 350mA@48V, limited to 15.4 W, so the voltage drops over the maximum 100 feet of cable, resulting in usable power of only around 13W.

Power over Ethernet (PoE) 802.3at (PoE+) allows powered devices to draw up to about 25W, with a maximum current of 600 mA.

Power over Ethernet (PoE) 802.3bt (PoE++ or 4PPoE) supplies up to about 51W (Type 3) or 73W (Type 4) usable power.