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USB connection speed in combination with LTE/5G modem

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USB connection speed in combination with LTE/5G modem

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USB connection speed in combination with LTE/5G modem
USB connection speed in combination with LTE/5G modem
2025-05-29 11:29:49 - last edited 2025-05-30 02:44:03
Model: ER8411  
Hardware Version:
Firmware Version:

Hello,

 

I want to use 5g with the ER8411 modem. How fast is the connection speed for modems connect through the USB port, is it the full 3.0 USB speed of 5Gbit/s?

 

I'm using the router for my home lab. Before we had fiber but no the best speed that we can get is over 5g. I would prefer to use USB instead the WAN port so I can use the modem as a fallback when we would get a fiber connection again.

 

If it's relevant the modem I want to use is the Teltonika TRM500.

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Re:USB connection speed in combination with LTE/5G modem-Solution
2025-05-30 02:44:00 - last edited 2025-05-30 02:44:03

  @Thaodan

Port is USB 3.0.


 

The speed depends on what you have from the modem. Hardware interface would not be the key factor affecting the speed. The theoretical speed is 5Gbps for this port.

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Re:USB connection speed in combination with LTE/5G modem-Solution
2025-05-30 02:44:00 - last edited 2025-05-30 02:44:03

  @Thaodan

Port is USB 3.0.


 

The speed depends on what you have from the modem. Hardware interface would not be the key factor affecting the speed. The theoretical speed is 5Gbps for this port.

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Re:USB connection speed in combination with LTE/5G modem
2025-05-30 04:57:32
I'm aware that the interface is USB 3.0 but I wasn't sure if the router support the full usb 3.0 speed Thank for confirming that.
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Re:USB connection speed in combination with LTE/5G modem
2025-06-16 14:00:31 - last edited 2025-06-16 18:19:29

Is it possible to tell to send specific AT commands to the modem? I noticed that the router has the right drivers enabled for my modem but doesn't configure it correctly.

 

EDIT: After setting the modem into ECM mode, which then can use the CDC ECM driver, the modem works. 

The only thing I wonder if MBIM would be better, if the router can configure the modem in that mode that is.. There's also RNDIS but it's not recommended to be used.

 

https://quickopen.readthedocs.io/en/latest/5-usb/UsbNet.html

 

EDIT2: Grepping the GPL code shows me that MBIM should work. However there's a bug in the router when it tries to load the module. Where would I forward my logs/report the bug? From a quick internet it could be that it is a bug in OpenWRT.

 

Here are a few of the relevant lines from dmesg:

[13402.328265] cdc_mbim: Unknown symbol cdc_ncm_bind_common (err 0)
[13402.335747] cdc_mbim: Unknown symbol cdc_ncm_rx_verify_nth16 (err 0)
[13402.343682] cdc_mbim: Unknown symbol cdc_ncm_unbind (err 0)
[13402.349673] cdc_mbim: Unknown symbol cdc_ncm_fill_tx_frame (err 0)
[13402.356013] cdc_mbim: Unknown symbol cdc_ncm_select_altsetting (err 0)
[13402.363142] cdc_mbim: Unknown symbol cdc_ncm_change_mtu (err 0)
[13402.369234] cdc_mbim: Unknown symbol cdc_ncm_rx_verify_ndp16 (err 0)
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