# ePMP Force 300-25 PoE Compatability
**URL:** https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275
**Category:** ePMP
**Created:** [February 21, 2022, 12:51pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275 "2022-02-21T12:51:17Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Jabar\_Ali](https://community.cambiumnetworks.com/u/Jabar_Ali)
#### Post date: [February 21, 2022, 12:51pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/1 "2022-02-21T12:51:18Z")
I have a Point to Point link established for around a Year now using a Pair of Force 300-25 . It’s working fine and is delivery 99Mbps consistently.
We have upgraded our link capacity to 300Mbps.
Issue is we have only Telecom DC -48v power and we have DC PoE switch providing power to other APs (Ubnt and Mikrotik). These other devices have straight polarity.
But Cambium Force 300-25 have reverse polarity.
Going through the Cambium Forum [Force 300-25 PoE Rev & Straight Polarity](https://community.cambiumnetworks.com/t/force-300-25-16-poe-support/62267), Where it specifies that Devices Manufactured after May-2018 are compatible with Both Reverse and Straight polarity PoE…
Extracted from Above link
**- Here is the how you can identify if your F300 will work with both polarities:**
Check 3rd and the 4th letters on the MSN (Serial number of the device) - E6 **UA** 02KRCLXX.
- If the 3rd Letter is either {V,W,X,Y,Z}
- If the 3rd letter is U and 4th letter is either {E,F,G,H,J,K,L,M}
Devices with other MSNs will support reverse polarity only
Now my devices have MSN codes as follows.:
**1)Point A:**
MSN : **E6VG08FR3W90**
Firmware version : U-Boot IPQ40xx 2012.07.26 (Nov 22 2018 - 16:17:27)
Software version : 4.1.4
**2)Point B:**
MSN : **E6VG08XNZGL9**
Firmware version : U-Boot IPQ40xx 2012.07.26 (Nov 22 2018 - 16:17:27)
Software version : 4.1.4
From the above link can we make sure that these 2 devices can be powered using Poe from straight polarity as is with other APs on this site.??
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### Author:  [@Support\_Hardik1](https://community.cambiumnetworks.com/u/Support_Hardik1)
#### Post date: [February 21, 2022, 1:09pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/2 "2022-02-21T13:09:20Z")
Yes, you are right. Both the devices will work with both polarities.
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### Author:  [@Jabar\_Ali](https://community.cambiumnetworks.com/u/Jabar_Ali)
#### Post date: [February 21, 2022, 3:06pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/3 "2022-02-21T15:06:39Z")
Thank you for your confirmation…
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### Author:  [@ninedd](https://community.cambiumnetworks.com/u/ninedd)
#### Post date: [February 22, 2022, 5:22am UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/4 "2022-02-22T05:22:42Z")
> [@Jabar\_Ali](#):
>
> we have only Telecom DC -48v power
Nearly all the Force300’s (except for the first couple builds) are polarity agnostic. It’s good to check, but mostly all of them are ± or -+ just fine. HOWEVER, you’ll still want to be sure about your voltages… **a Force 300-25 is a 30v device, not a 48v/56v device**.
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### Author:  [@aka](https://community.cambiumnetworks.com/u/aka)
#### Post date: [February 23, 2022, 3:10pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/5 "2022-02-23T15:10:40Z")
It is an important note! We have some customers burned their F300.
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### Author:  [@Jabar\_Ali](https://community.cambiumnetworks.com/u/Jabar_Ali)
#### Post date: [February 23, 2022, 4:48pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/6 "2022-02-23T16:48:17Z")
Sure @ninedd , Thanks for reminding.
We have PoE switch with 48vdc input which gives straight polarity PoE 24vdc output …, Which I hope us sufficient to run up the Force 300-25
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### Author:  [@system](https://community.cambiumnetworks.com/u/system)
#### Post date: [February 23, 2023, 4:49pm UTC](https://community.cambiumnetworks.com/t/epmp-force-300-25-poe-compatability/84275/7 "2023-02-23T16:49:07Z")
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