Fri Jan 27, 2012 8:30 pm
We have a major project that requires 4G LTE over Verizon in USA. There are only four modem options:
1. Pantech UML290 - Gobi 3000 chipset, USB, EVDO, external antenna ports
2. Novatel 551L - Gobi 3000 chipset, USB, EVDO, no external antenna ports, poor quality materials - Can't use
3. Sierra Wireless MC7750 - Gobi 3000 chipset, miniPCIe, EVDO, HSPA+, EDGE, GPRS, uses full miniPCIe signals, not just USB - Can't use
4. Novatel E362 - Gobi 3000 chipset, miniPCIe, EVDO, HSPA+, EDGE, GPRS, may only use USB, so might be able to use
Cannot use Bandrich. Verizon will not be authorizing this modem.
The bottom line is that we have to support Gobi 3000 in order to work with Verizon LTE. We want to use MT, ROS and MIPS AR71xx processors for this, but the current support for LTE is limited to cdc ethernet drivers that are not compatible with Qualcomm management interface which runs on its own USB endpoint.
Ideally we need to support the Pantech UML290, since that is what we have used so far, just locking them to EVDO mode.
The Pantech has the following layout:
0 (2/2/1): CDC-ACM for AT commands
1 (10/0/0): CDC-DATA for interface 0
2 (ff/ff/ff): Qualcomm DIAG
3 (ff/fd/ff): NMEA
4 (ff/fe/ff): Pantech WMC
5 (ff/f0/ff): RMNET/QMI port
A team of developers has been working on patches to the cdc_wdm module of the Linux USB drivers in the latest kernel. This driver is part of the NEXT test release of kernel. They are very close to having this all working in linux (may already be working, but they need to test). Then all that needs to be developed is the user space application to manage it. What I was hoping was that MT could make this part of 5.13 release and grab the code from kernel driver, add some command fields to the PPP client dialog and get GOBI and in particular the UML290 supported. This will open up a huge market opportunity.
Assuming that this won't happen we are also working on bringing this capability into OpenWRT and then putting that onto our RBs. We really don't want to do that. It is a support nightmare, but we have to do something.
We can provide some support towards getting this done such as documentation. See attached.
MT, is this possible?
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