<div dir="ltr"><div>Hello.</div><div><br></div><div>Yes, the modems are powered through an intermediate USB hub with its own power.</div><div><br></div><div>Is there a way to confirm if it's a power issue?<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em dom., 26 de set. de 2021 às 05:19, Aleksander Morgado <<a href="mailto:aleksander@aleksander.es">aleksander@aleksander.es</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hey,<br>
<br>
> Hey guys. I’m trying to connect 3+ modems on my PI, all of these modems are working if I connect them individually, but once I connect all of them together I get at least one that can’t get a connection.<br>
><br>
> Something always happens on the third modem that makes it stay in a unknown state:<br>
><br>
> -------------------------<br>
> General | path: /org/freedesktop/ModemManager1/Modem/3<br>
> -------------------------<br>
> System | device: /sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.1/1-1.1.2/1-1.1.2.4/1-1.1.2.4.6<br>
> | drivers: qmi_wwan, option<br>
> | plugin: generic<br>
> | primary port: cdc-wdm2<br>
> | ports: cdc-wdm2 (qmi), ttyUSB7 (at), ttyUSB8 (at), wwan2 (net)<br>
> -------------------------<br>
> Status | signal quality: 0% (cached)<br>
> -------------------------<br>
> Modes | supported: allowed: any; preferred: none<br>
> | current: allowed: any; preferred: none<br>
><br>
> This modem works when I connect it by itself. I also tested different permutations and it seems it’s always the third modem that can’t get a connection, independently of which one I put on first. This is the full log with debug on: <a href="https://pastebin.com/L3QWBppt" rel="noreferrer" target="_blank">https://pastebin.com/L3QWBppt</a><br>
><br>
> Any ideas?<br>
<br>
Maybe there's too much current drained by the 3 modems when connected?<br>
Are the modems powered through an intermediate USB hub with its own<br>
power? Or are the modems all being powered by the RPi USB ports<br>
directly?<br>
<br>
-- <br>
Aleksander<br>
<a href="https://aleksander.es" rel="noreferrer" target="_blank">https://aleksander.es</a><br>
</blockquote></div>