XB3-C-GM2-UT-001 Band support mismatch

XBee & XBee Gateway XBee - Cellular
1

According to the XB3-C-GM2-UT-001 specifications and user manual, this module should support the following cellular bands:

LTE Bands: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19, B20, B25, B26, B27, B28, B66, B71, B85;
2G Bands: B2, B3, B5, B8

However, I am not seeing these options in practice. I am using this module with the ConnectCore8M Mini dev kit. Modem Manager is reporting these are the supported bands:

Bands | supported: egsm, dcs, pcs, g850, eutran-1, eutran-2, eutran-3,
| eutran-4, eutran-5, eutran-8, eutran-12, eutran-13, eutran-18,
| eutran-19, eutran-20, eutran-25, eutran-26, eutran-27, eutran-28

I believe “egsm, dcs, pcs, g850” are the 2G bands B2, B3, B5, and B8. I do not see B66, B71, or B85 in the list. Why doesn’t this module have access to B66, B71, or B85? We are finding some regions where the modules will need to fall back on these higher 4G frequencies for coverage.

I am not masking any bands with the Xbee ‘BM’ command. I am also not masking any bands through ModemManager.

This module is running XBee firmware version 11620. The Telit modem is running firmware version 37.00.235, revision 0.

Thanks,
Bryan

2

Bryan,

Have you read the AT command to see what the BM is set to? Remember that this command is in a Bit Mask with the first channel being at bit 0.

3

I have confirmed BM is set to FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF.

4

This is the default band mask. It is going to allow the radio to use every channel it supports.

5

Yes, the XBee should not be masking any radio bands. Then do we know why ModemManager says B66, B71, or B85 are not supported for this module?