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MichaelDC
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Posts: 19
Joined: Mon May 22, 2017 2:40 pm

Dual LM960 on RM33G

Mon Oct 25, 2021 1:12 pm

Extending the test with the LM960A18 I tried connecting 2 modems on a RBM33G.
Individually both LM960A18 work on the RB


When in mPcie port 1
[admin@MikroTik] > system resource usb print
# DEVICE VENDOR NAME SPEED
0 1-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 480
1 2-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 5000
2 1-1 Telit Wireless Solutions LM960A18 480

When in mPcie port 2
[admin@MikroTik] > system resource usb print
# DEVICE VENDOR NAME SPEED
0 1-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 480
1 2-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 5000
2 1-2 Telit Wireless Solutions LM960A18 480

When in USB port 3
[admin@MikroTik] > system resource usb print
# DEVICE VENDOR NAME SPEED
0 1-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 480
1 2-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 5000
2 2-1 Telit Wireless Solutions LM960A18 5000

So the modems are detected wherever I connect them. However, whichever combination I use, it will only display 1 LM960A18 as LTE interface, even when there are 2 or even 3 the same devices (2mPCie + 1 USB) connected. The usb ports are correctly detected but only 1 LTE interface comes up.

[admin@MikroTik] > system resource usb print
# DEVICE VENDOR NAME SPEED
0 1-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 480
1 2-0 Linux 3.3.5 xhci-hcd xHCI Host Controller 5000
2 2-1 Telit Wireless Solutions LM960A18 5000
3 1-2 Telit Wireless Solutions LM960A18 480
4 1-1 Telit Wireless Solutions LM960A18 480


This does not occur when using e.g. 2 of any other CAT6 LTE modems EG25G, R11LTE6...

Is this a limitation of the RBM33G, the MT7621A SoC or incorrect configuration of the LM960A18?

Thanks for sharing your wisdom.
M.

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