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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| author | version | line-number | content |
|---|---|---|---|
| 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]] | ||
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| 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 | ||
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| 23 | = 3. What to check? = | ||
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| 25 | 3.1 Check whether module detect the SIM card? | ||
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| 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]] | ||
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