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44	44	== 2.2 Speed Up Network Attach time ==
45	45
46	46
47		-BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail. User can lock the band to specify band for its operator to make this faster.
	47	+BC660K-GL supports multi bands (% style="color:blue" %)**B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85. **(%%) It will search one by one and try to attach, this will take a lot of time and even cause attach fail and show Signal Strenght:99. User can lock the band to specify band for its operator to make this faster.
48	48
49	49	(% style="color:#037691" %)**AT+QBAND?       **(%%) ~/~/ Check what is the current used frequency band
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621	621	(% style="color:blue" %)**See result in TCP Server:**
622	622
623	623	[[image:image-20230807233631-2.png]]
	624	+
	625	+
	626	+= 4. FAQ =
	627	+
	628	+== 4.1 What is the usage of Multi Sampling and One Uplink? ==
	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	+
	649	+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.
	650	+
	651	+If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)
	652	+
	653	+[[image:image-20240207002003-1.png]]
	654	+
	655	+
	656	+If fail to attach network, it will shows signal 99. as below:
	657	+
	658	+[[image:image-20240207002129-2.png]]
	659	+
	660	+
	661	+(% class="lead" %)
	662	+When see this issue, below are the checklist:
	663	+
	664	+* Does your SIM card support NB-IoT network? If SIM card doesn't not specify support NB-IoT clearly, normally it doesn't support. You need to confirm with your operator.
	665	+* Do you configure the correct APN? [[Check here for APN settings>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.1GeneralConfiguretoattachnetwork]].
	666	+* Do you lock the frequency band? This is the most case we see. [[Explain and Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.2SpeedUpNetworkAttachtime]].
	667	+* Check if the device is attached to Carrier network but reject. (need to check with operator).
	668	+* Check if the antenna is connected firmly.
	669	+
	670	+If you have check all above and still fail. please send console log files (as many as possible) to [[support@dragino.com>>mailto:support@dragino.com]] so we can check.
	671	+
	672	+