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Last modified by Xiaoling on 2023/04/24 08:49
From version 7.1
edited by Edwin Chen
on 2023/04/23 22:42
Change comment: There is no comment for this version
To version 5.3
edited by Xiaoling
on 2022/07/22 17:11
Change comment: There is no comment for this version

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Title
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1 -Signal Strength:99. CSQ:99,99
1 +CSQ:99,99
Author
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1 -XWiki.Edwin
1 +XWiki.Xiaoling
Content
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1 -= 1. Issue Output =
1 += **Introduction** =
2 2  
3 3  ----
4 4  
5 -NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output:
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.
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 -
14 14  (((
15 15  Below is the definition for the (% style="color:blue" %)**AT+CSQ**
16 16  )))
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20 20  CSQ Definition
21 21  
22 22  
23 -= 3. What to check? =
24 24  
25 -3.1 Check whether module detect the SIM card?
17 +(% style="color:red" %)**In this case, you can check:**
26 26  
27 -
28 28  * Whether the antenna connection is good.
29 -
30 30  * Whether you use a valid SIM Card
31 -
32 32  * Whether you the SIM card place correctly.
33 -
34 34  * Whether the NB-IoT Network you use match the End Device Module support network.
35 -
36 36  * Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]]
37 37  
38 38  
image-20230423223628-1.png
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1 -XWiki.Edwin
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1 -42.7 KB
Content