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3	3	When you use NB-IoT module and run the command AT+CSG=99,99. It means the device doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31.
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5	5	(((
6		-Below is the definition for the (% style="color:blue" %)**AT+CSQ**
	4	+Below is the definition for the **AT+CSQ**
7	7	)))
8	8
9		-[[image:image-20220530094441-1.png]]
	7	+[[image:https://wiki.dragino.com/images/thumb/5/5d/NB-IoT-CSQ_11.png/600px-NB-IoT-CSQ_11.png||height="644" width="600"]]
10	10
11	11	CSQ Definition
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	11	+In this case, you can check:
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15		-(% style="color:red" %)**In this case, you can check:**
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17	17	* Whether the antenna connection is good.
18	18	* Whether you use a valid SIM Card
19	19	* Whether you the SIM card place correctly.
20	20	* Whether the NB-IoT Network you use match the End Device Module support network.
21		-* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]]
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	17	+* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>http://8.211.40.43:8080/xwiki/bin/view/Main/Specify%20NB-IoT%20Band/]]