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Last modified by Xiaoling on 2023/04/24 08:49
From version 8.1
edited by Edwin Chen
on 2023/04/23 23:08
Change comment: Uploaded new attachment "image-20230423230549-2.png", version {1}
To version 1.2
edited by Xiaoling
on 2022/05/17 15:15
Change comment: There is no comment for this version

Summary

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1 -Signal Strength:99. CSQ:99,99
1 +CSQ:99,99
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1 -XWiki.Edwin
1 +XWiki.Xiaoling
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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 -
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