I received my replacement MC7700 for the one that fried itself and slapped it into the CF-19. Canada Post backed down from locking out its workers once they sensed the tide of public opinion was turning against them and I finally received it. So I did a bit more experimenting and have a bit more understanding of what I am doing, and realized that my above-quoted post was slightly wrong.
Disclaimer: Anything we do here with commands that require the OEM password can screw up your WWAN module. You do this at your own risk. So that's why before doing any of this, it's wise to backup the RF calibration data with
...so that in case you screw things up you can
Don't restore without saving first.
Backing up and restoring takes a few seconds before you get an OK.
These modules can be configured to respond to a particular group of frequency bands while excluding others. Masks are a way of defining what you let through. The MC7700 supports B1, B4 and B17 LTE but if for some reason a carrier wants to limit it to, for example, B4, this is what these commands are for. In our hands, we can simply apply the mask that allows all three LTE and nine 2G/3G bands by loading the mask that has the "All bands" name.
The !BAND command allows you to query your currently loaded mask, to write your own masks then reload them or load one of the existing 10 default masks that were added at the factory. So when we issue AT!BAND=
10,"All bands",CE80380,10009 we are actually ADDING an
11th band mask. (apparently there's a maximum 13 indexes allowed) It's actually useless because it appears to be identical to the one that is in index #00. Furthermore we are not actually loading it, we are just adding it to a retrievable index.
Other thing to note is that the text description "All bands" is just that, a name. So if you do this:
Code:
AT!BAND=10,"Banana",CE80380,10009
It will appear at index 10 with the title Banana when you list your available indexes with !BAND=?
Erasing band masks can be done with this command to remove index 10 in this example:
In my opinion it's best to NOT write your own band mask indexes and just use the existing ones.
Modifying or erasing the indexes between 00 to 09, while not fatal, is a generally bad idea unless you backed up your data or saved the text somewhere for reference. You can hopefully restore the defaults with !BANDDEF
Want to test out 2G connectivity in your area and disable 3G and LTE? Load the North America 2G index:
I've also been playing around with !GBAND that allows you to load masks directly without bothering with indexes, but it's best to not get into that.
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CONCLUSION: you want to load the "All bands" mask to enable all three LTE and nine 2G/3G bands.
Use a serial terminal application to connect to the WWAN modem's COM port.
Enter the OEM password.
Check to see if it's already loaded. If it is, quit here and you're all set:
Code:
AT!BAND?
Index, Name, GW Band Mask L Band Mask
00, All bands, 000000000CE80380 0000000000010009
If not then find the All bands mask and its index number. It should be 00 but it's good to check in case the index list was flushed or modified.
Code:
AT!BAND=?
Index, Name, GW Band Mask L Band Mask
00, All bands, 000000000CE80380 0000000000010009
01, Europe 3G, 0000000000400000 0000000000000000
02, North America 3G, 0000000004800000 0000000000000000
03, Europe 2G, 0000000000000380 0000000000000000
04, North America 2G, 0000000000280000 0000000000000000
05, GSM ALL, 0000000000280380 0000000000000000
06, Europe, 0000000000400380 0000000000000001
07, North America, 0000000004A80000 0000000000010008
08, WCDMA ALL, 000000000CC00000 0000000000000000
09, LTE ALL, 0000000000000000 0000000000010009
0000000000010000 - B17
0000000000000008 - B4
0000000000000001 - B1
0000000008000000 - B6 (800)
0000000004000000 - B5 (850)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)
0000000000200000 - G1900
0000000000080000 - G850
0000000000000200 - G900P
0000000000000100 - G900E
0000000000000080 - G1800
Looks like it was index 00. So load it:
You can check that it was loaded with
Code:
AT!BAND?
Index, Name, GW Band Mask L Band Mask
00, All bands, 000000000CE80380 0000000000010009
You're done.
Note: this could get boring if you purchased a MC7700 that had its indexes erased or modified by a carrier or end user. Try issuing a
to see if it loads back the defaults.
Problems? See this thread at archive.org.
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