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3		-~(% _msthash="315238" _msttexthash="18964465" _mstvisible="3" %)~*~*Table of Contents：~*~*
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9	9	= OverView =
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11	11	In real-world deployment for LoRa, distance is a common topic. We always want to have the longest distance. This chapter shows some instructions for how to improve this.
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21	21
22	22	* **Data Rate(DR): **This is a combination of Spreading Factor and Band Width. Lowest Data Rate (DR=0) always has the longest transmit distance in LoRaWAN protocol.
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24	24	Below is the TXPower and DR table of EU868 Frequency band as reference.
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26	26	[[image:image-20221006185826-1.png]]
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42	42	|**US915**|20 or 22 dBm (depends on max output of module)|SF=10|125Khz
43	43	|**AS923**|14dBm|SF=12|125Khz
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45	45	== Adaptive Data Rate (ADR) and set max distance ==
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47	47	ADR is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time.