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
