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623	623	[[image:image-20230807233631-2.png]]
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626		-= 4. Trouble Shooting: =
	626	+= 4. FAQ =
627	627
628		-== 4.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
	628	+== 4.1 What is the usage of Multi Sampling and One Uplink? ==
629	629
	630	+The NB series has the feature for Multi Sampling and one uplink. See one of them
	631	+
	632	+[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SN50v3-NB_BN-IoT_Sensor_Node_User_Manual/#H2.5Multi-SamplingsandOneuplink]]
	633	+
	634	+User can use this feature for below purpose:
	635	+
	636	+1. **Reduce power consumption**. The NB-IoT transmit power is much more higher than the sensor sampling power. To save battery life, we can sampling often and send in one uplink.
	637	+1. Give more sampling data points.
	638	+1. Increase reliable in transmission. For example. If user set
	639	+1*. **AT+TR=1800** ~/~/ The unit is seconds, and the default is to record data once every 1800 seconds (30 minutes, the minimum can be set to 180 seconds)
	640	+1*. **AT+NOUD=24** ~/~/  The device uploads 24 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
	641	+1*. **AT+TDC=7200**  ~/~/ Uplink every 2 hours.
	642	+1*. this will mean each uplink will actually include the 6 uplink data (24 set data which cover 12 hours). So if device doesn;t lost 6 continue data. There will not data lost.
	643	+
	644	+
	645	+= 5. Trouble Shooting: =
	646	+
	647	+== 5.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
	648	+
630	630	There are many different providers provide NB-IoT service in the world. They might use different band, different APN & different operator configuration. Which makes connection to NB-IoT network is complicate.
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632	632	If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)