Q1: I need a digital data link for the drone. distance of about 10 ~15KM (ground to air). the bandwidth of about 4Mbps.

A1: Please check the below link model, which is suitable for your demand. https://ivcan.com/p/two-way-wireless-transmission-digital-data-video-link/

Q2: I want to send and receive data in the drone and controller system,

A2: It is no problem, it can transfer and receive the video and data at a max of up to 20MB bps.

Q3: Can I use an ethernet port for other data except for video?

A3: yes, just like an invisible net cable between transmitter and receiver, just like you use a computer in a local area network, you can connect the transmitter and the receiver through the ethernet ports of the two computers respectively.

Q4: What type of antenna we must use in the access and central nodes?

A4: The fiberglass or normal antenna is ok, but the transmitter and receiver antenna need to be the same frequency. Here are some Transmitters and Receivers for your reference. Fiberglass Receiver Antenna https://ivcan.com/p/wireless-video-transmission-receiver-omni-fiberglass-antenna/ Metal Iron Rod Receiver Antenna https://ivcan.com/p/cofdm-receiver-antenna-for-wireless-video-transmission-rx-aerial-vcan1514/ Metal Iron Whip Transmitter Antenna https://ivcan.com/p/cofdm-transmitter-antenna-for-wireless-video-transmission-tx-aerial/

Q5: How to set the parameter of the Digital Data Link Module?

A5: As there are one or two ethernet ports on the digital video data link module, please use one cable to connect your computer, at the browser, it is the graphic UI we parameter setting page. Please check the below link for details. https://ivcan.com/web-device-management-ui/

Q6: How about the RS232 port?

A6: For most drone users, the ethernet port is used for video transmission by IP camera. RS232 port is used for data transmission, not only downloading the drone data but also uploading the receiver's command to control the drone or the PTZ camera. From the 110km test video, we can talk directly by audio port between the transmitter and receiver. https://youtu.be/r1X4AU1togE