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	1	+= Introduction =
	2	+
	3	+In LoRaWAN protocol, the gateway output power refer to the downstream packets sent by Gateway. This output power is controlled by LoRaWAN server.
	4	+
	5	+Gateway maintain a power index in the file: /etc/lora/global_conf.json for example:
	6	+
	7	+(% class="box" %)
	8	+(((
	9	+"tx_lut_3": {
	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	+ "pa_gain": 2,                            ~/~/ to the value mentioned here so to generate 15dB output power.
	12	+ "mix_gain": 10,
	13	+ "rf_power": 15,
	14	+ "dig_gain": 1
	15	+},
	16	+"tx_lut_4": {
	17	+ "desc": "TX gain table, index 4",
	18	+ "pa_gain": 2,
	19	+ "mix_gain": 10,
	20	+ "rf_power": 16,
	21	+ "dig_gain": 0
	22	+)))
	23	+
	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.
	25	+
	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.
	27	+
	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