The moral of the story is that powering LTE modems via USB isn't plug and play. If you want to make sure your LTE modem doesn't periodically crash, make sure your power source can handle it.
And if you are looking to power a high performance LTE modem from USB2, you'll definitely want two USB connections.
Oh, BTW, ltefix.com is shutdown due to supply chain disruption. They were selling stuff on facebook, but they've shut that down too. The last I heard from them, they hoped to be back in business in a couple of weeks.
Short and good USB cables are also essential. Most USB data cables aren't made for 1A currents, leading to significant voltage drops. The modem brownout protection will reset the modem, looking like a crash. This can be very confusing because of the constantly varying power requirements of LTE modems. The "crashes" often appear to be related to external events, like handovers or high rate data transmission. You can spend a lot of time trying to figure out why the modem "crashes" only under some specific condition, when the solution is as simple as replacing the USB cable.
Also, I recommend using a USB enclosure that has two USB connectors like the one that ltefix.com sells (unfortunately, they are shut down right now). The spec sheet for the 7455 says the maximum current draw is 1.5A which is 4.95W. USB3 supplies 5V a max 900ma. Even assuming a 100% efficient 5V -> 3.3V conversion, USB3 can only supply 4.5W.
Yes. My laptop has one of those, so it's pretty well tested with the Linux drivers
I'm not sure you need to worry too much about 900mA @ 5V being less than the specifed peak. The issue is more like having only USB2 (500mA) and a cable voltage drop of 1V or more. You don't necessariy need a Y cable or multiple cables.
FWIW, I am using a EM7565 in one of these adapters (the IT-NBU3A version) connected to the USB3 port of a WRT1900ACv1 using a 50cm USB3 extension cable: https://www.aliexpress.com/item/32794435102.html I haven't seen an unexpected reset yet. But this might obviously depend on my network conditions, which are pretty good.
That's what this thread is about. There are several suggestions further up...
FWIW, most LTE modems are supported and have AT commands. Which is why you won't find a list of them.
EDIT: Except that many of the USB stick modems are configured as routers by default, which hides all the modem interfaces from the host. So it is safest to use a m.2 or miniPCIe module to be sure you have AT commands
The device you are talking about, as far as I can tell, it looks like a phone? Are you suggesting to use a phone?
I will have to look at the WRT3200ACM and determine if it has an USB3 port or not. However, a quick inspection of the Netgear WNDR3700v2 shows me it is not USB3. I presume this device would still work on USB2, just much more slowly?
I bought and tested the Fibocom L860-GL and was able to switch its mode to USB. Then used MBIM but failed to actually have it working in OpenWRT. I may lack the knowledge on how to get the drivers churning or get Modemmanager to work with it.