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1		-**~ Contents:**
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2	2
3	3	{{toc/}}
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60	60
61	61	= 2. Notice of US915/CN470/AU915 Frequency band =
62	62
63		-(((
64	64	If user has problem to work with lorawan server in band US915/AU915/CN470, he can check:
65		-)))
66	66
67		-* (((
68		-What **sub-band** the server support ?
69		-)))
70		-* (((
71		-What is the **sub-band** the gateway support ?
72		-)))
73		-* (((
74		-What is the **sub-band** the end node is using ?
75		-)))
	65	+* What **sub-band** the server support ?
	66	+* What is the **sub-band** the gateway support ?
	67	+* What is the **sub-band** the end node is using ?
76	76
77		-(((
78	78	All of above should match so End Node can properly Join the server and don't have packet lost.
79		-)))
80	80
81		-(((
82		-
83		-)))
84		-
85		-(((
86	86	In LoRaWAN protocol, the frequency bands US915, AU915, CN470 each includes at least 72 frequencies. Many gateways support only 8 or 16 frequencies, and server might support 8 frequency only. In this case, the OTAA join time and uplink schedule is long and unpredictable while the end node is hopping in 72 frequencies, because the end node will send data in many frequency that the gateway or server doesn,t support.
87		-)))
88	88
89		-(((
90		-
91		-)))
92		-
93		-(((
94	94	Here are the freuqency tables for these bands as reference:
95		-)))
96	96
97	97	[[image:https://wiki.dragino.com/images/thumb/3/3f/US915_FRE_BAND-1.png/600px-US915_FRE_BAND-1.png||height="170" width="600"]]
98	98
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194	194
195	195	we can use AT Command (AT+CFG) to check the RX1 configure and RX2 configure. as below:
196	196
197		-(% class="box infomessage" %)
198	198	(((
199		-AT+RX2FQ=869525000 ~-~--> The RX2 Window frequency
200		-)))
	176	+{{info}}
	177	+{{{AT+RX2FQ=869525000 ---> The RX2 Window frequency
	178	+AT+RX2DR=3 ---> The RX2 DataRate
	179	+AT+RX1DL=1000 ---> Receive Delay 1
	180	+AT+RX2DL=2000 ---> Receive Delay 2}}}
	181	+{{/info}}
201	201
202		-(% class="box infomessage" %)
203		-(((
204		-AT+RX2DR=3 ~-~--> The RX2 DataRate
	183	+
205	205	)))
206	206
207		-(% class="box infomessage" %)
208		-(((
209		-AT+RX1DL=1000 ~-~--> Receive Delay 1
210		-)))
211		-
212		-(% class="box infomessage" %)
213		-(((
214		-AT+RX2DL=2000 ~-~--> Receive Delay 2
215		-)))
216		-
217	217	when the device running, we can see below info:
218	218
219	219	{{{[12502]***** UpLinkCounter= 0 *****
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247	247	* Gateway traffic (from server UI) to shows the data exchange between gateway and server.
248	248	* End Node traffic (from server UI) to shows end node activity in server.
249	249
	219	+
250	250	= 6. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
251	251
252	252	In LoRaWAN, the gatewat will use the frequency specify by the server to transmit a packet as downlink purpose. Each Frequency band has different downlink frequency. and the gateway has a frequency range limited to transmit downlink.
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340	340	* Solution: Use the decoder to filter out this 00 packet.
341	341	* Some node decoders may not have filtering function, or you need decoders of other servers and formats. Please send an email to david.huang@dragino.cc
342	342
343		-(% class="wikigeneratedid" id="H" %)
344		-
	313	+== ==