Hello. Yes, the modems are powered through an intermediate USB hub with its own power.
Is there a way to confirm if it's a power issue? Em dom., 26 de set. de 2021 às 05:19, Aleksander Morgado < aleksan...@aleksander.es> escreveu: > Hey, > > > 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. > > > > Something always happens on the third modem that makes it stay in a > unknown state: > > > > ------------------------- > > General | path: /org/freedesktop/ModemManager1/Modem/3 > > ------------------------- > > 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 > > | drivers: qmi_wwan, option > > | plugin: generic > > | primary port: cdc-wdm2 > > | ports: cdc-wdm2 (qmi), ttyUSB7 (at), ttyUSB8 (at), > wwan2 (net) > > ------------------------- > > Status | signal quality: 0% (cached) > > ------------------------- > > Modes | supported: allowed: any; preferred: none > > | current: allowed: any; preferred: none > > > > 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: https://pastebin.com/L3QWBppt > > > > Any ideas? > > Maybe there's too much current drained by the 3 modems when connected? > Are the modems powered through an intermediate USB hub with its own > power? Or are the modems all being powered by the RPi USB ports > directly? > > -- > Aleksander > https://aleksander.es >
