Summary

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Details

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Author

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1		-XWiki.Edwin
	1	+XWiki.Xiaoling

Content

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	1	+**Table of Contents:**
	2	+
	3	+{{toc/}}
	4	+
	5	+
1	1	= 1. Issue Output =
2	2
3	3	----
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9	9
10	10	= 2. What is Signal Strenght? =
11	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.
	17	+Signal Strength is same as AT+CSQ command output. When you run (% style="color:blue" %)**AT+CSQ**(%%) and NB-IoT module return (% style="color:blue" %)**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	13
14	14	(((
15	15	Below is the definition for the (% style="color:blue" %)**AT+CSQ**
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24	24
25	25	== 3.1 Check whether module detect the SIM card? ==
26	26
27		-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:
	32	+You can see if the output shows the (% style="color:blue" %)**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:
28	28
29	29	* If SIM card is placed in correct direction.
	35	+
30	30	* Make sure there is power off / power on after insert SIM card.
31	31
32		-
33	33	== 3.2 Whether you use a NB-IoT SIM card that the module supports ==
34	34
35		-* Make sure the SIM card you use is a **NB-IoT SIM card**. It is different from normal SIM card we use for mobile.
36		-* 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.
	40	+* Make sure the SIM card you use is a (% style="color:blue" %)**NB-IoT SIM card**(%%). It is different from normal SIM card we use for mobile.
37	37
	42	+* If you use a NB-IoT SIM card, check whether the (% style="color:blue" %)**Frequency Band**(%%) of this operator are in the support list of the NB-IoT Sensor.
38	38
39	39	== 3.3 Whether the antenna connection is good ==
40	40
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49	49
50	50	=== 3.4.1 Extend attach time ===
51	51
52		-User can use AT Command to extend network acquisition time.For example **AT+CSQTIME=10** will extend the network acquisition time to 10 minutes.
	57	+User can use AT Command to extend network acquisition time.For example (% style="color:blue" %)**AT+CSQTIME=10**(%%) will extend the network acquisition time to 10 minutes.
53	53
54	54
55	55	=== 3.4.2 Lock Frequency Band ===