---
title: How to configure C423 PoE output on Ethernet ports
description: Learn about How to configure C423 PoE output on Ethernet ports for AltoPlex Radios. Step-by-step instructions and technical details from Altowav.
---

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# How to configure C423 PoE output on Ethernet ports

The C423 has three Ethernet ports:

![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/d423-numbered-ports1_6cda86ce.png?width=443&height=353&name=d423-numbered-ports1_6cda86ce.png)

- Port 1 is enabled by default for data transmission.  
    - Port 1 is also enabled for PoE input. PoE input cannot be disabled.
- Ports 2 and 3 are enabled by default for data transmission and PoE output.
  
    - The maximum output of each port is 70.4W. If the output exceeds 70.4W, the port will lose power.
    - The combined maximum output of both ports is 78 watts. 
          - Assumes 90 watts of PoE input on port 1, and 12 watts required to power the device.
          - If the maximum power output of ports 2 and 3 combined exceeds the maximum available power, this will  
            cause the device to fail to operate.
    - The actual amount of available power will vary based on environmental factors, such as the wattage provided by the PoE injector, and the length of the Ethernet cable connecting the PoE injector to port 1.

To disable either data transmission or PoE output:

1. Access the WebUI of the C423. In your browser's address bar, type:
   
   **https://*hostname***
   
   where *hostname* is the hostname (KB-XX-XX-XX) or IP address of the radio. See [Connecting to the AltoPlex radio](https://support.altowav.com/connect-to-the-altoreach-device.html#h3) for more information.
2. Click the **login** link in the WebUI header to log in as administrator. The default password is **admin**.
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/WebUI-login-link-with-wireless-tab_b61c241c.png?width=670&height=99&name=WebUI-login-link-with-wireless-tab_b61c241c.png)
3. Click the **LAN** tab.
   
   The Interface table lists interfaces by number:
   
   ![](https://support.altowav.com/hs-fs/hubfs/kb-images/altoplex-radios/interface_table_4914120c.png?width=473&height=155&name=interface_table_4914120c.png)
4. To disable data transmission, for **Port enable,** click to toggle off **Enable**.
5. To disable PoE output on port 2 and/or 3, for **PoE enable,** click to toggle off **Enable**.
6. Click **Submit Changes**.

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