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Last modified by Xiaoling on 2023/04/24 08:49
From version 5.1
edited by Xiaoling
on 2022/05/30 09:47
Change comment: There is no comment for this version
To version 8.1
edited by Edwin Chen
on 2023/04/23 23:08
Change comment: Uploaded new attachment "image-20230423230549-2.png", version {1}

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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 -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.
1 += 1. Issue Output =
2 2  
3 +----
4 +
5 +NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output:
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 +
3 3  (((
4 -Below is the definition for the **AT+CSQ**
15 +Below is the definition for the (% style="color:blue" %)**AT+CSQ**
5 5  )))
6 6  
7 7  [[image:image-20220530094441-1.png]]
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9 9  CSQ Definition
10 10  
11 11  
23 += 3. What to check? =
12 12  
13 -In this case, you can check:
25 +3.1 Check whether module detect the SIM card?
14 14  
27 +
15 15  * Whether the antenna connection is good.
29 +
16 16  * Whether you use a valid SIM Card
31 +
17 17  * Whether you the SIM card place correctly.
33 +
18 18  * Whether the NB-IoT Network you use match the End Device Module support network.
35 +
19 19  * Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]]
37 +
38 +
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1 +XWiki.Edwin
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