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	1	+= **Introduction** =
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	3	+----
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1	1	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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3	3	(((
4		-Below is the definition for the **AT+CSQ**
	8	+Below is the definition for the (% style="color:blue" %)**AT+CSQ**
5	5	)))
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7	7	[[image:image-20220530094441-1.png]]
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9	9	CSQ Definition
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12		-In this case, you can check:
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	17	+(% style="color:red" %)**In this case, you can check:**
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14	14	* Whether the antenna connection is good.
15	15	* Whether you use a valid SIM Card
16	16	* Whether you the SIM card place correctly.
17	17	* Whether the NB-IoT Network you use match the End Device Module support network.
18	18	* 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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