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1	1	= Introduction =
2	2
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3	3	In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
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4	4
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5	5	Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
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6	6
7	7	(% class="box" %)
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9	9	"tx_lut_3": {
10	10	"desc": "TX gain table, index 3",        ~/~/ Index 3 refer to rf_power: 15dB. device will set the pa_gain,mix_gain,dig_gain
11	11	"pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
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20	20	"rf_power": 16,
21	21	"dig_gain": 0
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24	24	When LoRaWAN server sends a downlink stream, server will also ask the gateway to use which rf_power as output. So user don't need to consider to control in the gateway side.
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25	25
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26	26	If user want to always use a higher power or a lower power. User can modify the pa_gain,mix_gain,dig_gain for specify rf_power to achieve this purpose. This is not recommend, because this might break the regulator for specify country.
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28	28	Please note, the global_conf.json file will be overwrite by the match region files in /etc/lora/cfg-30x when change settings in the web. So user need to change the files in /etc/lora/cfg-cfg-30x instead of global_conf.json
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