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-config file
+# Description on the Global Configuration File
+
+## Specifing channels
+Eight channels can be configured to receive LoRa packets using 125 kHz bandwith. These channels are configured in the **chan_multiSF_x** settings. Each channel has an enable boolean, a selected radio and an intermediate frequency. The channel frequency will freq setting of the radio plus the 'if' setting of the channel.
+* enable – true if this channel is enabled for use
+* radio – selected radio to listen for packets
+* if – intermediate frequency offset applied to the selected radio “freq” setting
+
+Two additional channels can be configured with the chan_Lora_std and chan_FSK settings
+* enable – true if this channel is enabled for use
+* radio – selected radio to listen for packets
+* if – intermediate frequency offset applied to the selected radio “freq” setting
+* bandwidth – channel bandwidth
+* spread_factor (LoRa) – channel spreading factor (7-12)
+* datarate (FSK) – channel datarate in bps
+
+## Other configurations
+* gateway_ID – gateway identifier sent in each message to the network server
+* server_address – address of the network server
+* serv_port_up – port for sending uplink packets to the network server
+* serv_port_down – port to ping network server and receive downlink packets
+* keepalive_interval – interval to ping the network server
+* stat_interval – interval to send stat messages to the network server
+* push_timeout_ms – socket timeout when publishing messages to the network server
+* autoquit_threshold – number of keepalive messages without response to wait before quitting Multi-Tech Systems, Inc.
+* forward_crc_valid – enable to forward valid packets to the network server, default: true
+* forward_crc_error – enable to forward CRC failed packets to the network server, default: true. The network server will reject packets with failed CRC, it may not be necessary to forward the packets except for a statistic of local RF quality or to monitor the gateway performance over time. Some random CRC failed packets are expected to be received from random noise.
+* forward_crc_disabled – enable to forward packets without CRC enabled to the network server, default: false. LoRaWAN protocol expects uplink packets to have CRC enabled.