# RB5 Ethernet Add-on

Source: https://forum.modalai.com/topic/962/rb5-ethernet-add-on
Category: Development Drones (https://forum.modalai.com/category/44/development-drones)
Tags: rb5
Posted: 2022-05-25 13:39:20 UTC by joshuagaus
Replies: 3 · Views: 739

## joshuagaus · 2022-05-25 13:39:20 UTC

In the RB5 documentation a "Gigabit Ethernet add-on with USB 3.1 Hub" is listed as an "Optional Expansion Add-On" along with the 5G modem and an SD card expansion.  https://docs.modalai.com/Qualcomm-Flight-RB5-functional-description/ 

Is this currently available? I cannot find reference to it anywhere else. 
I would like to integrate a third party radio with an Ethernet interface (Doodle labs RM-2450) with the RB5.

Thanks

## Reply by Chad Sweet (ModalAI staff) · 2022-05-25 16:27:48 UTC

You can just use a USB to Ethernet dongle. Our Doodle Labs integration guide is here https://docs.modalai.com/doodle-labs-user-guide/

## Reply by joshuagaus · 2022-05-26 12:38:21 UTC

Chad,

Thanks for pointing me in the right direction. 

2 Follow on questions: 

- for the RB5 specifically, do you suggest using the main usb-c port, or the modem carrier board J12 usb connector, or do I need to replace the modem carrier board with the VOXL USB Expansion?

- Is there a pinout for the modem carrier board on the RB5, as opposed to the main 'flight carrier board'? I only know that the J12 modem carrier connector is a usb connection because of this photo on the functional description page: https://docs.modalai.com/images/datasheet/RB5/rb5-labeled-2.png

## Reply by tom (ModalAI staff) · 2022-05-26 17:21:50 UTC

@joshuagaus You would use the 4 pin JST USB port on the modem carrier board.