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Last modified by Xiaoling on 2023/04/24 08:49
From version 1.2
edited by Xiaoling
on 2022/05/17 15:15
Change comment: There is no comment for this version
To version 7.1
edited by Edwin Chen
on 2023/04/23 22:42
Change comment: There is no comment for this version

Summary

Details

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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
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1 += 1. Issue Output =
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 +
14 +(((
15 +Below is the definition for the (% style="color:blue" %)**AT+CSQ**
16 +)))
17 +
18 +[[image:image-20220530094441-1.png]]
19 +
20 +CSQ Definition
21 +
22 +
23 += 3. What to check? =
24 +
25 +3.1 Check whether module detect the SIM card?
26 +
27 +
28 +* Whether the antenna connection is good.
29 +
30 +* Whether you use a valid SIM Card
31 +
32 +* Whether you the SIM card place correctly.
33 +
34 +* Whether the NB-IoT Network you use match the End Device Module support network.
35 +
36 +* Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]]
37 +
38 +
image-20220530094441-1.png
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1 +XWiki.Xiaoling
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1 +72.6 KB
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image-20230423223628-1.png
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1 +XWiki.Edwin
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1 +42.7 KB
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