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Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 11:57 am
by bnhf2
Has anybody here figured out to make use of the dual SIM capabilities of the MC7455 and EM7565?

This would be incredibly useful for us full-time RVers (and others of course) that are frequently swapping SIM cards. It appears both modems utilize a second set of pins on their respective interfaces (mPCIe for the MC7455 and M.2 for the EM7565) to communicate with a second SIM slot. Every existing adapter and on-router SIM slot is wired as #1 as far as I can tell.

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 12:33 pm
by JimHelms
I experimented with the dual SIM setup sometime ago.

From referencing my notes, you must first enable the dual Sim functionality in the modem:

Code: Select all

AT!ENTERCND="A710"
AT!CUSTOM="UIM2ENABLE",1
AT!RESET
The SIM cards will be references as "0" for SIM card Slot 1 and SIM card Slot 2 as "1" as shown below:

Code: Select all

AT!UIMS=?
!UIMS: (0-1)

OK
You can then check what SIM card slot is currently being used:

Code: Select all

AT!UIMS?
!UIMS: 0

OK
which shows SIM Card slot one is active. To change to the second SIM Card slot:

Code: Select all

AT!UIMS=1
AT!RESET

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 12:45 pm
by JimHelms
One more issue I seem to remember is that the modem "may" require two network interfaces when in QMI composition.

For example, to set the MC7455 DIAG, NMEA, MODEM, RMNET0, RMNET1 for two network interfaces:

Code: Select all

AT!ENTERCND=”A710”
AT!USBCOMP=1,1,50D
AT!RESET

As opposed to setting DIAG, NMEA, MODEM, RMNET0 for one network interface:

Code: Select all

AT!ENTERCND=”A710”
AT!USBCOMP=1,1,10D
AT!RESET
I am unsure if MBIM composition also requires the similar settings.

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 1:01 pm
by bnhf2
The AT commands match my understanding, however if you look at the technical spec for the MC7455 you'll see that each of the two addressable SIM slots has a separate set of mPCIe pins assigned to it. Have you actually tested using two different SIM cards, and switching between them? I hope you're right and both slots can be wired as SIM slot #1, but it doesn't appear to be the case.

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 1:21 pm
by JimHelms
I have tested the dual SIM card setup.

However, I was using a Cradlepoint dual SIM mini PCI-E adapter which may already have the pins configured that you mention.


Cradlepoint mPCIe.jpg

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 1:39 pm
by bnhf2
Do you know if that adapter can be purchased anywhere? Not finding it on Google.

Re: Utilizing MC7455 and EM7565 Dual SIM

Posted: Sat Sep 15, 2018 2:13 pm
by JimHelms
Google "Cradlepoint MC400"

The MC400 LPE will come with a MC7354 (or MC7355) Sierra Modem.

The MC400 LP6 will come with a MC7455 modem installed in them.