MC7455 'Call Failed'
bjorn at mork.no
Thu Jun 22 20:22:15 UTC 2017
Tim Harvey <tharvey at gateworks.com> writes:
> What is the purpose of the two QMI+WWAN interface pairs in these modems?
Enabling concurrent connections to more than one APN before the qmap
muxing feature was added. All Sierra QMI modems I have worked with have
had this, starting with the MC7710.
Side note: There are actually 3 pairs. But I've never gotten the 3rd
channel to work on any of the modems, so it was disabled in the driver a
long time ago. And with the MC74xx generation they made it officially
non-functional. I believe it is even disabled in the AT command
interface now, preventing you from easily enabling it in the firmware.
The two first channels work fine.
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