TRM500 as Cellular Backup on a router

NETWORKING SOLUTIONS
1

Hi Community,

I have a Zyxel EX3600-TO as a router for my fiber connection at home. It supports cellular backup on its USB port. So I bought a TRM500 to use for this purpose.

Now the problem is that the router doesn’t even recognize the TRM500 when I connect it, it doesn’t sense anything being connected. When I connect it directly to my laptop (Win 11) it works well.

Any suggestions what to do?

Kindly, Mikael

2

Hi,

Probably doesn’t recognize because drivers needed? On Win11 most of times it automatically install needed drivers.

Most of these routers give list of supported/tested USB modems.
Probably you should try to write to Zyxel support or forum for help.

Link to TRM500 drivers:

3

Thank you Lemondude. The drivers on the link are only for Windows and Android, no Linux.

Yes, I am looking at Zyxel too, the other side of the problem.

My simple guess would be to find a way to make the TRM500 act like a modem, so that no drivers are needed on a Linux environment.

5

Hello, @Ryking ,

I’ve reached out to our R&D to ask about this and will get back to you once I have more details.

Thank you for your patience,
M.

6

Hello again, @Ryking ,

The R&D has inquired about the Zyxel router that you own. Specifically, they would like to know:

  1. What operating system does the device use
  2. What data protocols does it support (e.g., RMNET, ECM, MBIM, RNDIS)

They’ve also mentioned, and I quote:
If it's a Linux-based system and the RG520N-EB module's VID:PID is not recognized by the kernel serial driver, the user might need to manually add the VID:PID using: echo VID PID > /sys/bus/usb-serial/drivers/option1/new_id
(Replace VID and PID with the actual values for the module.)

Regards,
M.