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...	...	@@ -925,15 +925,17 @@
925	925
926	926	You can view the information sent by the server: ch_mask in Unconfirmdedatadown
927	927
	928	+[[image:https://qiye.aliyun.com/attachment/downloadex?ri=%2Falimail%2FinternalLinks%2FrefreshToken&o=1&et=normal&ext=png&e=jinggeng.bei%40dragino.cc&f=cd202b4b-8b20-46fe-8982-dbd243323d7a&m=1_0%3ADzzzzyP5He.%24---.ULjrwi40&n=temp4cj.png]][[image:https://qiye.aliyun.com/attachment/downloadex?ri=%2Falimail%2FinternalLinks%2FrefreshToken&o=1&et=normal&ext=png&e=jinggeng.bei%40dragino.cc&f=cd202b4b-8b20-46fe-8982-dbd243323d7a&m=1_0%3ADzzzzyP5He.%24---.ULjrwi40&n=temp4cj.png]]
	929	+
928	928	[[image:image-20230821113255-1.png]]
929	929
930	930	According to lorawan's protocol, your first ch_mask is 7 for ChMaskCntl = 7 then 125 kHz channels are disabled. Simultaneously the channels 64 to 71 are set according to the ChMask bit mask.
931	931
932		-[[image:image-20230821113539-2.png]]
	934	+[[image:https://qiye.aliyun.com/attachment/downloadex?ri=%2Falimail%2FinternalLinks%2FrefreshToken&o=1&et=normal&ext=png&e=jinggeng.bei%40dragino.cc&f=f567abb7-c2b5-4d29-88ca-9c5885bd410b&m=1_0%3ADzzzzyP5He.%24---.ULjrwi40&n=temp4cj.png]][[image:image-20230821113539-2.png]]
933	933
934	934	In the second message, the channel 0~~7 is true, which means that your server is using subband2.
935	935
936		-[[image:image-20230821113618-3.png]]
	938	+[[image:https://qiye.aliyun.com/attachment/downloadex?ri=%2Falimail%2FinternalLinks%2FrefreshToken&o=1&et=normal&ext=png&e=jinggeng.bei%40dragino.cc&f=9c126577-ab4f-4c55-be34-5f3410bccdcd&m=1_0%3ADzzzzyP5He.%24---.ULjrwi40&n=temp4cj.png]][[image:image-20230821113618-3.png]]
937	937
938	938	Note:lorawan's protocol link——[[LoRaWAN® Regional Parameters v1.0.3revA (lora-alliance.org)>>url:https://resources.lora-alliance.org/document/lorawan-regional-parameters-v1-0-3reva]]
939	939	)))