Wiki source code of Signal Strength:99. CSQ:99,99
Version 8.1 by Edwin Chen on 2023/04/23 23:08
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7.1 | 1 | = 1. Issue Output = |
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5.2 | 2 | |
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5.3 | 3 | ---- |
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7.1 | 5 | NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output: |
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1.3 | 6 | |
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7.1 | 7 | [[image:image-20230423223628-1.png]] |
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| 10 | = 2. What is Signal Strenght? = | ||
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| 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. | ||
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1.4 | 14 | ((( |
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5.2 | 15 | Below is the definition for the (% style="color:blue" %)**AT+CSQ** |
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1.4 | 16 | ))) |
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1.3 | 17 | |
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4.1 | 18 | [[image:image-20220530094441-1.png]] |
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1.3 | 19 | |
| 20 | CSQ Definition | ||
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4.1 | 22 | |
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7.1 | 23 | = 3. What to check? = |
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5.1 | 24 | |
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7.1 | 25 | 3.1 Check whether module detect the SIM card? |
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1.3 | 26 | |
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7.1 | 27 | |
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1.3 | 28 | * Whether the antenna connection is good. |
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5.4 | 29 | |
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1.3 | 30 | * Whether you use a valid SIM Card |
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5.4 | 31 | |
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1.3 | 32 | * Whether you the SIM card place correctly. |
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5.4 | 33 | |
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1.3 | 34 | * Whether the NB-IoT Network you use match the End Device Module support network. |
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5.4 | 35 | |
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4.1 | 36 | * 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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