# Force 300- 25/16 PoE support

**URL:** https://community.cambiumnetworks.com/t/force-300-25-16-poe-support/62267
**Category:** ePMP
**Tags:** knowledge-base
**Created:** [June 21, 2019, 12:12pm UTC](https://community.cambiumnetworks.com/t/force-300-25-16-poe-support/62267 "2019-06-21T12:12:50Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Support\_Hardik1](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/support_hardik1/32/11547_2.png) [@Support\_Hardik1](https://community.cambiumnetworks.com/u/Support_Hardik1)
#### Post date: [June 21, 2019, 12:12pm UTC](https://community.cambiumnetworks.com/t/force-300-25-16-poe-support/62267/1 "2019-06-21T12:12:50Z")

</div>

**Summary:**

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;This article explains about the PoE which can be used to power on the Force 300- 25/16.

**Cause:**

- When the F300 product was initially released it only supported reverse polarity because we provided (and still do) a compatible power supply with it.
- **Reverse Polarity : PIN 4,5 ­– (Return) &nbsp;and&nbsp;&nbsp; PIN 7,8&nbsp; + (Data)**
- **Straight Polarity : PIN 4,5 + (Data)&nbsp; &nbsp; &nbsp; and &nbsp;&nbsp;PIN 7,8&nbsp; – (Return)**

- The product team made a running change around May 2018 in the factory to support both polarities and the specification sheet was updated because of this change.
- The F300’s which were produced prior to this change can only be powered on using the Reverse Polarity.
- **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

**Note:** &nbsp;_Currently, we do not offer any RMAs for the original units for the reason stated above; however, we can use the workaround._

**Solution(Workaround):**

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;To power on the older F300 with the Straight polarity PoE brick, cross pin 4/5 with pin 7/8 as shown below:

 ![Capture.PNG](https://d1okf4ta8xniw3.cloudfront.net/original/1X/2c219ab49d9d13cbeb19a123e9f4d3e05b97d63f.png "Capture.PNG")

**Note:** &nbsp;_Disable the auto PoE feature if it is enabled on the switch/Router which you are using_