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Last modified by Xiaoling on 2023/04/24 08:49
From version 1.1
edited by Xiaoling
on 2022/05/17 15:15
Change comment: There is no comment for this version
To version 10.1
edited by Edwin Chen
on 2023/04/23 23:29
Change comment: There is no comment for this version

Summary

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1 -CSQ:99,99
1 +Signal Strength:99. CSQ:99,99
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1 -XWiki.Xiaoling
1 +XWiki.Edwin
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1 -{{box cssClass="floatinginfobox" title="**Contents**"}}
1 +
2 +
3 +**Table of Contents:**
4 +
2 2  {{toc/}}
3 -{{/box}}
4 4  
5 -= Paragraph 1 =
6 6  
7 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
8 += 1. Issue Output =
8 8  
9 -== Sub-paragraph ==
10 +----
10 10  
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12 +NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output:
12 12  
13 -== Sub-paragraph ==
14 +[[image:image-20230423223628-1.png]]
14 14  
15 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
16 16  
17 -=== Sub-sub paragraph ===
17 += 2. What is Signal Strenght? =
18 18  
19 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
19 +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.
20 20  
21 +(((
22 +Below is the definition for the (% style="color:blue" %)**AT+CSQ**
23 +)))
21 21  
22 -= Paragraph 2 =
25 +[[image:image-20220530094441-1.png]]
23 23  
24 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
27 +CSQ Definition
25 25  
26 -== Sub-paragraph ==
27 27  
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30 += 3. What to check? =
29 29  
30 -== Sub-paragraph ==
32 +== 3.1 Check whether module detect the SIM card? ==
31 31  
32 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
34 +You can see if the output shows the **IMSI number**. If NB-IoT module detects SIM card successful, There will be a IMSI number shown, this is from the SIM card. If SIM card not detect, please check:
35 +
36 +* If SIM card is placed in correct direction.
37 +* Make sure there is power off / power on after insert SIM card.
38 +
39 +== 3.2 Whether you use a NB-IoT SIM card that the module supports ==
40 +
41 +* Make sure the SIM card you use is a **NB-IoT SIM card**. It is different from normal SIM card we use for mobile.
42 +* If you use a NB-IoT SIM card, check whether the **Frequency Band** of this operator are in the support list of the NB-IoT Sensor.
43 +
44 +== 3.3 Whether the antenna connection is good ==
45 +
46 + See  the connection of Antenna Path is loose.
47 +
48 + [[image:image-20230423230549-2.png||height="370" width="428"]]
49 +
50 +
51 +== 3.4 Check Software Settings ==
52 +
53 +In the NB-IoT Sensor which power by battery. The sensor will try to connect to NB-IoT in a specify time (For example 5 minutes), if sensor is not able to attach network in 5 minutes. Sensor will stop retry and put the NB-IoT module in sleep mode to save battery life. So in the case that attaching network needs more time than 5 minutes, it will cause module hard to attach NB-IoT network. There are two solution to solve this.
54 +
55 +=== 3.4.1 Extend attach time ===
56 +
57 +User can use AT Command to extend network acquisition time.For example **AT+CSQTIME=10** will extend the network acquisition time to 10 minutes.
58 +
59 +
60 +=== 3.4.2 Lock Frequency Band ===
61 +
62 +NB-IoT module by default support multi-bands, and it will try to use these bands to attached network one by one. User can lock the frequency band to the SIM card band to speed up the process.
63 +
64 +See [[how to lock frequency band>>doc:Main.Specify NB-IoT Band.WebHome]].
65 +
66 +
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