problem about AT%XCBAND=?

hi support team,

customer had one problem about "AT%XCBAND=? "

first. Customer try to set catm and catnb systemmode together as below, i could not see the band17 in list:

[16:43:53.099] AT%XFACTORYRESET=0

[16:48:21.233]

[16:48:21.233] OK

[16:48:21.233] AT%XFACTORYRESET=1

[16:48:23.659]

[16:48:23.659] OK

[16:48:23.659] AT%XBANDLOCK=1,"10001100000001010"

[16:48:26.335]

[16:48:26.335] OK

[16:48:26.335] AT%XBANDLOCK=2,"10001100000001010"

[16:48:29.173]

[16:48:29.173] OK

[16:48:29.173] AT%XCBAND=?

[16:48:32.368]

[16:48:32.368] %XCBAND: (2,4,12,13)

then we change systemmode to catnb only, it shows band17 as below:


[16:49:16.633] AT%XSYSTEMMODE=0,1,0,0
[16:49:21.557]
[16:49:21.557] OK
[16:49:21.557] AT%XCBAND=?
[16:49:26.089]
[16:49:26.089] %XCBAND: (2,4,12,13,17)

then. i start the modem as AT+CFUN=1, the band 17 show quite slow:

[16:49:56.018] AT+CFUN=1

[16:50:02.586]

[16:50:02.586] OK

[16:50:02.586] AT%XCBAND=?

[16:50:08.516]

[16:50:08.516] %XCBAND: (2,4,12,13)

[16:50:08.516]

[16:50:08.516] OK

[16:50:08.516] AT%XCBAND=?

[16:50:13.511]

[16:50:13.511] %XCBAND: (2,4,12,13)

[16:50:13.511]

[16:50:13.512] OK

[16:50:13.512] AT%XCBAND=?

[16:50:18.510]

[16:50:18.510] %XCBAND: (2,4,12,13)

[16:50:18.512]

[16:50:18.512] OK

[16:50:18.512] AT%XCBAND=?

[16:50:23.519]

[16:50:23.519] %XCBAND: (2,4,12,13,17)

[16:50:23.519]

[16:50:23.519] OK

the question is ,is there any reason for this command? 

Regards,

William.

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