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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 and show Signal Strenght:99. 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. 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
50	50
51	51	(% style="color:#037691" %)**AT+QBAND=1,4    **(%%) ~/~/ Set to use 1 frequency band. Band4
52	52
53		-(% style="color:#037691" %)**Europe General**(%%) **AT+QBAND=2,8,20 ** ~/~/ Set to use 2 frequency bands. Band 8 and Band 20
	53	+(% style="color:#037691" %)Europe General(%%) **AT+QBAND=2,8,20 ** ~/~/ Set to use 2 frequency bands. Band 8 and Band 20
54	54
55		-(% style="color:#037691" %)**Verizon**(%%)** ** AT+QBAND=1,13
56		-(% style="color:#037691" %)**AT&T**(%%)           AT+QBAND=3,12,4,2
57		-(% style="color:#037691" %)**Telstra**(%%)        AT+QBAND=1,28
58		-(% style="color:#037691" %)**Softband**(%%)     AT+QBAND=2,3,8
	55	+(% style="color:#037691" %)Verizon(%%) AT+QBAND=1,13
	56	+(% style="color:#037691" %)AT&T(%%) AT+QBAND=3,12,4,2
	57	+(% style="color:#037691" %)Telstra(%%) AT+QBAND=1,28
	58	+(% style="color:#037691" %)Softband(%%) AT+QBAND=2,3,8
59	59
60	60	After connection is successful, user can use (% style="color:#037691" %)**AT+QENG=0 **(%%) to check which band is actually in used.
61	61
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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. Trouble Shooting: =
627		-
628		-== 4.1 Checklist for debuging Network Connection issue. Signal Strenght:99 issue. ==
629		-
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.
631		-
632		-If end device successfully attached NB-IoT Network, User can normally see the signal strengh as below (between 0~~31)
633		-
634		-[[image:image-20240207002003-1.png]]
635		-
636		-
637		-If fail to attach network, it will shows signal 99. as below:
638		-
639		-[[image:image-20240207002129-2.png]]
640		-
641		-
642		-(% class="lead" %)
643		-When see this issue, below are the checklist:
644		-
645		-* 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.
646		-* 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]].
647		-* 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]].
648		-* Check if the device is attached to Carrier network but reject. (need to check with operator).
649		-* Check if the antenna is connected firmly.
650		-
651		-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.
652		-
653		-

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