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Title

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1		-CSQ:99,99
	1	+Signal Strength:99. CSQ:99,99

Author

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1		-XWiki.Xiaoling
	1	+XWiki.Edwin

Content

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1		-= **Introduction** =
	1	+= 1. Issue Output =
2	2
3	3	----
4	4
5		-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.
	5	+NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output:
6	6
	7	+[[image:image-20230423223628-1.png]]
	8	+
	9	+
	10	+= 2. What is Signal Strenght? =
	11	+
	12	+Signal Strength is same as AT+CSQ command output. When you run **AT+CSQ** and NB-IoT module return **AT+CSQ=99,99**. It means NB-IoT Sensor doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31.
	13	+
7	7	(((
8	8	Below is the definition for the (% style="color:blue" %)**AT+CSQ**
9	9	)))
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13	13	CSQ Definition
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15	15
	23	+= 3. What to check? =
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17		-(% style="color:red" %)**In this case, you can check:**
	25	+3.1 Check whether module detect the SIM card?
18	18
	27	+
19	19	* Whether the antenna connection is good.
	29	+
20	20	* Whether you use a valid SIM Card
	31	+
21	21	* Whether you the SIM card place correctly.
	33	+
22	22	* Whether the NB-IoT Network you use match the End Device Module support network.
	35	+
23	23	* 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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25	25

image-20230423223628-1.png

Author

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	1	+XWiki.Edwin

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	1	+42.7 KB

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